Excellent demonstrations Mr. Pete! These two methods are more effective then I realized; I will use them in the future. How many times do we tell you not to worry about the nit pickers and the trolls! They are unhappy people and will always spread negativity. I'm repeating myself, but Mr. Pete is both my favorite shop AND science teacher!
I was involved in sending a 200 HP DC motor out for repair. We struggled with a 50 ton hydraulic puller to get the coupling off the 4" motor shaft. When it came back to us I had a plan. We had walk in freezers available at this site so we put the entire motor in one of the freezers overnight. We also heated the coupling in the oven to about 400F. The guys I worked with did not think it would help at all. The only reason they went along with me was because they had no better ideas. The coupling slide right on by hand. As my dad taught me, work smarter, not harder.
A friend who had a machine shop did just such thing to remove a steel shaft from an aluminum housing after corrosion froze the shaft. We were amazed, as we'd hammered on the shaft quite hard with no positive effect. Your demonstration was far more expansive and opened some options we have now just learned. Thanks, Mr. Pete
Thanks for keeping these older videos available. I'm making an aluminum table for a Post Drill, and need to shrink the table around a steel support swivel.
To add to my last Mr Pete, with all the learning on the internet I think we should all have a computer in the garage or shed so we can all learn from each other and hopefully only one of us will break or damage something that is irreplaceable.Expect it will be me.Thanks for all your videos from this side of the pond.
Kroger stores near me have dry ice. I believe aluminum reacts to temps more than most metals..so lower heat would probably be just as good. Great demonstration, as always. Thanks, Mr. Pete.
Excellent video again, and I really enjoy the extra topics and tangents you put in which make it all the more entertaining and educational. Please keep up the great work and never be discouraged by the trolls. Thanks.
Mr. Pete, thank you for the knowledge, these are great tips! I also liked the history concerning ball bearings and Germany which I did not know. I will defiantly will be watching more of your videos, I really enjoy the stories and experience told by Older Timers than me. It's sad soon there will be no one left to pass this knowledge on!
Your rig that you used to measure the shrinkage is sort of the same principle that I used to use with a device called a high temperature diatometer. We used that to measure the coefficient of thermal expansion (CTE) of various materials. I used the same principle to shrink fit a new Iron cylinder liner in my motorcycle years ago. Very interesting. Keep up the good work.
Years ago I worked for Westinghouse Heavy Apparatus division. Once I had to pull a vacuum on a newly installed transformer. This thing was about 16 feet tall. The vacuum pump was so strong that 2" thick steel sides would bend in slightly. Vacuum was pulled to force any moisture out of the transformer oil. Then after a day the vacuum would be replaced by dry nitrogen and run up to several pounds of inside pressure to ward off any moisture leaking in. This is because at 120 KVA the oil had to be a good insulator. To check if nitrogen was dry I would have a device which as a pot metal box with a stainless steel cup. The cup extended down into a chamber and one could look thru a plastic window to see the side of the cup. The cup was filled with acetone and then lumps of dry ice would go into the cup. The temperature would drop to -120 or whatever... when nitrogen tank valve was opened and the gas would pass thru the chamber you could watch for any condensation on the sides of the very cold cup in the chamber. No condensation meant your nitrogen was dry and safe to charge the interior of the transformer with. Anyway, I would get dry ice by spraying a CO2 extinguisher into a card board box and with welding gloves pick up the chunks to put into the acetone and it would bubble and bring the temperature down for testing the nitrogen gas.
+user990077 They make a tool that does that very same thing. Spray CO2 extinguisher into a canvas type bag to produce dry ice to pack around bearings,sleeves and bushings in the automotive machine shop trade
Mr. Pete, you do a great job of demonstrating real world physics. Thanks. Regarding damaging bearings by driving them out with a hammer and drift against net the inner race, who cares? Almost nobody removes a good bearing. Damaging a bad bearing? So? It's already bad. You are replacing it. If one is hell bent on saving an old bearing, have at it. My experience says they will soon be replacing the bearing, anyway. You have my support 100%. Thanks, John
Pride goeth before destruction, and an haughty spirit before a fall. More easy google scholarship on my part, but you're eloquent, Mr Pete, and usually hit the nail on the proverbial head. Keep the videos coming!
I always enjoy your bonus subject matter, especially regarding history, machine work and the intersections. Keep it coming, It is also your character and your video. I am going to comment on warts. As a young man i had horrible warts on my hands. It made treework difficult, painful, and i was self conscious especially around women. In college a young woman helped me find a solution where western medicine failed for years. In maine a wild plant known as milkweed grows. It is the plant that monarch butterflies cocoon on. Also as i understand during ww2 life preservers were stuffed with the seed tufts. Tear a living leaf off the plant and dab the milky sap onto the warts liberally. allow to air dry and leave it on. After years of suffering this got rid of them in two weeks! They have not come back. Hope this helps and I will send you some if your area does not have it.
I used the combo method with re-installing a valve seat in a Tecumseh. Leave the head outside in the mid-summer sun, out of any wind and put the seat in the freezer. After two hours, bring them together and work quickly. I added a drop of red loctite to it to help prevent a repeat of that problem. It had been shut down abruptly, under full load at full throttle, and left to sit while some yard debris was removed. When he got back to the mower and tried to start it, there was no compression. The temperature spike caused the exhaust valve seat to loosen up, and since it came to rest with the exhaust valve open, it dropped out of it's bore.
I am very glad that I found your videos. I just started to get into blacksmithing as a hobby and came across your lead hammer videos....now I am binge watching your shop tips. Thanks for the very precise information. P.S. don't take this the wrong way but you remind me of my grandfather. He was an officer in the army and then later went on to be a telephone tower engineer for Bell.
Used to heat up tractor rear axle bearings in motor oil and shrink lock collars by heating them to what I was taught was battleship gray color using oxy/acetylene torch.
Mr Pete! For a fun experiment, make a trough by folding a sheet of paper in half and pour the co2 into it with the trough aimed at a lit candle. I used to do that with co2 from baking soda and vinegar and people were amazed at how the candle would be extinguished while nothing visible was coming from the cup!
great video as usual, and yes the sun idea works, i installed head bearings on a motorcycle years ago by leaving the frame in the sun for a few hours , the bearings dropped right in :)
My Air Force ROTC instructor was shot down on that Schweinfurt mission and spent the rest of the war as a POW. "Twelve O'clock High" is a splendid movie about the early years of our daylight missions over occupied Europe; it stars Gregory Peck. Check it out. Mr. Pete, our fathers were part of the "greatest generation" and we're blessed to be raised by such heroes.
Wonderful video. It reminds me of science class in the early 1960s. My favorite airplane is the deHavilland Beaver DHC-2 with the original Pratt and Whitney R 985 Wasp Junior radial engine.
The Schweinfurt Raids were an expensive lesson on the costs of daylight bombing for the USAAF and as it turned out the German's discovered they had greater stockpiles of ball bearings than first thought and were also able to buy in supplies from Switzerland and/or Sweden to make up production shortfalls. It turned out that the Oil Campaign when combined with the cumulative effect of the Transportation Plan, bombing rail, road, shipping along with the pressures of a multi front war and the extra transport required for dispersed production facilities broke the back of the German War Economy. Repeated bombings of oil production facilities greatly reduced the subsequent production and storage capacities after every raid resulting in a growing death spiral till Germany was virtually out of oil or substitutes to make petrol and lubricants to run the various machines required in a modern mechanized war.
i've found it at some grocery stores as well...but if you have a welding supply house anywhere in your area, (one that supplies specialty gases and such for welding) they will typically have dry ice for sale as well. (though they tend to have the "pellet" version)
Hi. You can remove those bearing without causing damage providing you use a press or a jacking method carefully. When one belts the centre of the bearing with a drift it will cause damages. However I enjoyed this presentation very much. Thank you. I'm not smart, just inquisitive.
When I was in submarines, we used to cool down bearings in the freeze box , we stopped doing this because of the condensation causing rust in the housing and the bearings failing. For bearing going on the shaft first, we used a small induction heater; took just a minute. The hard part was installing them in the large end bells - it took forever using a heat gun.
Seeing is believing and I wish my metal shop teacher had taken the time to conduct a demonstration like this rather than simply do a verbal explanation of what happens because of expansion and contraction relating to the fit between parts. After hearing you mention the Eighth air forces attacks on German bearing manufacturing plants I am reminded that very near where I live in Connecticut - New Departure Bearings in Bristol CT. actually buried stockpiles of extra bearings underground near their plant in case of enemy bombing attacks - if the plant was bombed they had bearings to ship.
The engineering center where I worked used CO2 to cool thermal cycle Chambers. They had a drop line in the garage. If we needed dry ice, we put a canvas bag on the line and opened the valve. Instant dry ice.
I can't believe that after the hundreds of videos you have made that viewers think they have to stop to tell what they think you are doing wrong. After all of these videos has he not proved he knows what he is doing? I get mad for you Pete!
Nope,,, we don't argue, the brick shrank, the shaft on the dial indicator shrank, not the bearing. Only kidding. Thanks for another great video. I used dry ice in acetone to shrink a kingpin for my truck,,, it slid right in,,,, no pounding.
the interesting thing to me is that it expands away from the hole instead of the surrounding material expanding in both directions and shrinking the hole
Great video as usual Mr Pete. I can use these methods within my workplace now with confidence. Quick question, when you put the dry ice on the hot casting, could it crack it? Thanks for sharing with us.
I used to get my dry ice at Jack and Jill ice cream distributors. Now Acme markets (may be albertsons near you) usually has it in the front of the store.
I like the video Mr Pete and i like it when you go off topic always interesting. When I working in the shop I heard the term sweating a bearing on. Is that a proper term and if so could you show how it is done. Have a day
Some car parts sell a product that freezes the metal up to minus -40. It's under pressure. I did use it and it works well. Also, ice can be brought at welder's compress air dealer. Thanks for showing.
+Robert Patoine Utiliser un extincteur co2 reformé et une taie d'oreillé pour récupérer la neige. Vous en trouvez partout des extincteurs co2 "périmé" et pas cher ;)
I vaguely remember a physics prof telling us that Antimony (Sb) is the only metal which shrinks on heating (or expands on cooling). Any experience with Antimony?
I was in the Army and was stationed in Schweinfurt back in the late 80's. I read up on the city's history and the bombing campaign that took place during the war. Remember seeing ball bearing plants in Schweinfurt. Think it was SKF and/or FAG still had plants there.
Bearings should never be heated too much, even the ones without sealing. INA recommends 100°C for mounting. 120°C should not be exceeded to avoid a loss of strength of the bearing races. In most cases it is sufficient to heat one part to 100°C and to cool the other part in the refrigerator to -25°C.
+koviack You set the funnel on a light bulb and put the bearing on the funnel. The light bulb heats the funnel and the funnel heats and expands the bearing.
Hi Mr. Pete,Have you thought about using one of the $20 infrared non-contacting thermometers? Seems like that would be good to have with the Sterling engines, too.
Near the end of the war the daytime bombing raids were also used to intentionally bait the Luftwaffe fighters into the air so our mustangs could shoot them down. By the time D-day came Germany had no air defense as a result. Chris
+shadowdog500 You are correct about using the bombers as bait, but the D-Day timing is I believe incorrect. the Luftwaffe pulled the majority of fighters out of France for the defence of the Reich.
+Mark Fryer They had to pull all of their fighters to defend Germany by mid 43 because there weren't many fighters left for anything else. The germans lost fighter planes at an alarming rate when our daylight raids began in 1942. In 1943 we were shooting down their fighter pilots faster than they could train new ones. We shot down 141% of the fighter pilots that they started within Jan 43. In the 5 months before D-day daylight bombing raids were resumed, with Mustang escorts, and more than half of the remaining German fighters were shot down as a result. Chris
Why is it heated in the oven and not just heated in the housing bearing using a torch before dousing it with ice water? What are the risks if we just heat the bearing housing using a torch and then cool it using ice water before inserting the bearing?
from 12:28 to 12:55 you can hear the whistle of the gas of the torche. You have put out the flame with the CO2, but it seems to continue to propelling the gas. be careful.
+Trevor Burke ah, never mind that guy, Trevor. At first he called it a "lighter thing"..I called him on it, along with his criticism...then he edited it to "torche"..gotta laugh at that.
Another example, when I would change the ring gear around a flywheel that the starter drives I would take the new gear out of the box and set the box on fire. I would then put it in the fire. After good and hot the ring gear would fall onto the flywheel. After it cooled it was tighter than dicks hatband!
Apparently they use a heating technique for changing the tires on train wheels. Yes, tires. The running surface of the wheel is softer steel to take wear off the rails, and periodically they'll take the wheels off, surround a wheel with a ring of gas torches and heat the tire until it comes off then pop on a new one in the same fashion.
+Alexander Roderick There are some good "old time" videos both British and American showing this being done in workshops on large locomotive wheels using large pin wheel like gas burners. Scarey stuff.
+Alexander Roderick Are you thinking of steam locomotive drivers or are you thinking of European railroad practice? Steam locomotive driving wheels are complicated and expensive to cast and they were cast in cast iron which is less expensive than steel so steel tyres were turned to be heated and set over the cast iron centers which had the spokes, crank pins, and counterweight to cool and shrink onto the wheels to provide the running surface. When this surface and/or flange was too worn the tyre was removed, scrapped, and a new tyre installed bringing the wheel back to new condition without having to recast the center and remachine it. At least one switching railroad uses this technique to save costs in wheel changes due to the sharp curves wearing the flanges very fast compared to over the road diesels. I believe European railroads use tyres on all equipment to keep from having to press the old wheels off. machine a new wheel to fit the axle then press the new wheel back on to the axle. It is faster to remove the worn tyre, heat the new one and then install the new one to the wheel center than the press off-machine-press on method. These wheels also have a ring installed on the backside of the wheel to help keep the tyre on.
You could put 240 volts arse-backwards through a big 240-110v transformer to get over 400v, control the AC side for simplicity and just rectify the output.
Mrpete I thought you and or your followers might be interested in Abom79 video that is just what you have been doing with bearings and but on a very large scale. It is Heavy Metal Machining part 1 take a look at it I think you will enjoy it.
+mrpete222 And the B25's toward the end of the war. P.S. Engineers aren't worth their salt without basic common sense, street smarts (learned by hands on and failure)...and good teachers. Thanks Mr. Pete!
+OLD WIPPER-SNAPPER i do love the sound of a P51.. but the sound of a V12 rolls royce merlin engine gives me goose bumps.. but that's just me no offence....
+Kevin Willis Yepper! Nothing like it except maybe the sound of a 69' Lamborghini Maura S, wound up. Merlin's are still one of the most beautiful engines ever built, in my book. When they finally got enough in the P-51D it changed the course of the war and aerial combat in Alt/Speed....defeating more than a few ME262's toward the end.
i prefer Co2 extinguishers and have foam ones too. i hate powder ones but will use it on other peoples stuff or when a item is on fire that is fubar. as for the dry ice on the wart, well, most medicine got invented ot improved by experimenting.
8:41 The reason why so many bombers were lost on the Schweinfurt run was because the target was very deep in Germany, and the bombers did not yet have fighter escort all the way to the target and back. Once the long-range fighters started protecting the bombers, the losses dropped sharply.
Mrpete -I am a HUG fan of your videos and I have learned a tremendous amount about machine work & casting so Thank you! but when you said Co2 Fire extinguisher it made me think back to your core video and using sodium silicate (water glass) binder could I use the dry ice & build a set to get the same effect to harden the sand core? I've been looking & thinking of ways to generate Lg amounts Co2 for core making ever since I watched your core video- Two Thumbs Up
12:28 The flame goes out... we still hear gas from the torch... 12:55 "Upstairs we go"... gas still running from the torch... good thing he doesn't smoke eh?
Yeah I know what carbon dioxide is. Problem is its not easy to come by in some countries. So what I do is just place the bearings in a plastic bag and put them in the freezer.
+dale pratt no disrespect to mrpete, he is part of a dying breed. I worked in machine tool for 13 yrs and am still in mfg for over 33 years. Toolmakers, at least good ones, are getting harder to find. Now where did I put that coaxial indicator???
+Kenny Weimann what I'd really like to see is apprentice programs come back. There are many young kids dying to learn about machining and who better to teach them than the veteran toolmakers.
Kenny, if you meant no disrespect, then show none...I think his resume more than matches your own. I've watched every video he has made, and he knows every correct technique there is concerning machine shop. This was a simple demo about thermal contraction and nothing more. If you want to teach others yourself, congratulations to you, indeed...just start making your own vids and do just that. I'll be the first to subscribe. For you to presume to correct a man who is a second-generation machine shop teacher and former professional machinist himself only shows you haven't taken the time to learn about him...and renders your comment to simple internet graffiti.
Dale, I guess it's just the engineer in me (currently a mfg engineer). I've watched all of his videos. When I saw him moving a non-fixed assembly instead of the bearing against a fixed plane, the light bulbs went off. I'd like to make some videos but working 2 jobs to pay for kids college is keeping me busy. My public apology to mrpete if he took offense, none intended.
If you don't know what dry ice is, your school system has failed you, and you have failed to be intellectually curious. Not sure I've met someone who doesn't know what dry ice is. I hope I haven't.
This vid coulda been 2 minutes long with editing. WD-40. Drive the old bearing out as you did. WD-40 again, take the new bearing and drive it in using the outer race and a same size socket or bar diameter. Just keep it square. I've done this countless times.
Excellent demonstrations Mr. Pete! These two methods are more effective then I realized; I will use them in the future.
How many times do we tell you not to worry about the nit pickers and the trolls! They are unhappy people and will always spread negativity.
I'm repeating myself, but Mr. Pete is both my favorite shop AND science teacher!
I was involved in sending a 200 HP DC motor out for repair. We struggled with a 50 ton hydraulic puller to get the coupling off the 4" motor shaft. When it came back to us I had a plan. We had walk in freezers available at this site so we put the entire motor in one of the freezers overnight. We also heated the coupling in the oven to about 400F. The guys I worked with did not think it would help at all. The only reason they went along with me was because they had no better ideas. The coupling slide right on by hand. As my dad taught me, work smarter, not harder.
You were the hero of the day--it works
Mr. Pete, let's hope some young folks get to see these videos and it inspires them, thanks for sharing and thanks for taking the time to share.
A friend who had a machine shop did just such thing to remove a steel shaft from an aluminum housing after corrosion froze the shaft. We were amazed, as we'd hammered on the shaft quite hard with no positive effect. Your demonstration was far more expansive and opened some options we have now just learned. Thanks, Mr. Pete
Thanks for keeping these older videos available. I'm making an aluminum table for a Post Drill, and need to shrink the table around a steel support swivel.
👍👍
To add to my last Mr Pete, with all the learning on the internet I think we should all have a computer in the garage or shed so we can all learn from each other and hopefully only one of us will break or damage something that is irreplaceable.Expect it will be me.Thanks for all your videos from this side of the pond.
I'm always happy when you do your "asides".
Kroger stores near me have dry ice. I believe aluminum reacts to temps more than most metals..so lower heat would probably be just as good. Great demonstration, as always. Thanks, Mr. Pete.
Excellent video again, and I really enjoy the extra topics and tangents you put in which make it all the more entertaining and educational. Please keep up the great work and never be discouraged by the trolls. Thanks.
Mr. Pete, thank you for the knowledge, these are great tips!
I also liked the history concerning ball bearings and Germany which I did not know.
I will defiantly will be watching more of your videos, I really enjoy the stories and experience told by Older Timers than me.
It's sad soon there will be no one left to pass this knowledge on!
👍👍
Thanks for the Memory MR Pete. I was stationed in Schweinfurt In Germany in 2006. IF you ever have a chance to visit, I highly recomend it!!
Thanks--I laways wanted to visit Germany
Your rig that you used to measure the shrinkage is sort of the same principle that I used to use with a device called a high temperature diatometer. We used that to measure the coefficient of thermal expansion (CTE) of various materials. I used the same principle to shrink fit a new Iron cylinder liner in my motorcycle years ago.
Very interesting. Keep up the good work.
Years ago I worked for Westinghouse Heavy Apparatus division. Once I had to pull a vacuum on a newly installed transformer. This thing was about 16 feet tall. The vacuum pump was so strong that 2" thick steel sides would bend in slightly. Vacuum was pulled to force any moisture out of the transformer oil. Then after a day the vacuum would be replaced by dry nitrogen and run up to several pounds of inside pressure to ward off any moisture leaking in. This is because at 120 KVA the oil had to be a good insulator. To check if nitrogen was dry I would have a device which as a pot metal box with a stainless steel cup. The cup extended down into a chamber and one could look thru a plastic window to see the side of the cup. The cup was filled with acetone and then lumps of dry ice would go into the cup. The temperature would drop to -120 or whatever... when nitrogen tank valve was opened and the gas would pass thru the chamber you could watch for any condensation on the sides of the very cold cup in the chamber. No condensation meant your nitrogen was dry and safe to charge the interior of the transformer with. Anyway, I would get dry ice by spraying a CO2 extinguisher into a card board box and with welding gloves pick up the chunks to put into the acetone and it would bubble and bring the temperature down for testing the nitrogen gas.
+user990077 Very interesting-thanks
+user990077 They make a tool that does that very same thing. Spray CO2 extinguisher into a canvas type bag to produce dry ice to pack around bearings,sleeves and bushings in the automotive machine shop trade
Another very interesting and entertaining video Mr. Pete. Please keep them coming. Best regards.
Memphis Belle is one my favorite movies. as soon as you brought up the allied bombing raids, I thought of this movie.
"I am going way off topic but i like doing this"
~every teacher ever
+Joost Brekelmans Only the good ones.
@@MrUbiquitousTech curiosity is truly a joy! Seems like something all good teachers have in common!
Mr. Pete, you do a great job of demonstrating real world physics. Thanks.
Regarding damaging bearings by driving them out with a hammer and drift against net the inner race, who cares?
Almost nobody removes a good bearing. Damaging a bad bearing? So? It's already bad. You are replacing it.
If one is hell bent on saving an old bearing, have at it. My experience says they will soon be replacing the bearing, anyway.
You have my support 100%.
Thanks,
John
Pride goeth before destruction, and an haughty spirit before a fall. More easy google scholarship on my part, but you're eloquent, Mr Pete, and usually hit the nail on the proverbial head. Keep the videos coming!
I always enjoy your bonus subject matter, especially regarding history, machine work and the intersections. Keep it coming, It is also your character and your video. I am going to comment on warts. As a young man i had horrible warts on my hands. It made treework difficult, painful, and i was self conscious especially around women. In college a young woman helped me find a solution where western medicine failed for years. In maine a wild plant known as milkweed grows. It is the plant that monarch butterflies cocoon on. Also as i understand during ww2 life preservers were stuffed with the seed tufts. Tear a living leaf off the plant and dab the milky sap onto the warts liberally. allow to air dry and leave it on. After years of suffering this got rid of them in two weeks! They have not come back. Hope this helps and I will send you some if your area does not have it.
I used the combo method with re-installing a valve seat in a Tecumseh. Leave the head outside in the mid-summer sun, out of any wind and put the seat in the freezer. After two hours, bring them together and work quickly. I added a drop of red loctite to it to help prevent a repeat of that problem.
It had been shut down abruptly, under full load at full throttle, and left to sit while some yard debris was removed. When he got back to the mower and tried to start it, there was no compression. The temperature spike caused the exhaust valve seat to loosen up, and since it came to rest with the exhaust valve open, it dropped out of it's bore.
Nice class and a lot of fun
Yes, the summer sun will heat it enough to expand it.
Thanks!
All the best!
Mike
I am very glad that I found your videos. I just started to get into blacksmithing as a hobby and came across your lead hammer videos....now I am binge watching your shop tips. Thanks for the very precise information. P.S. don't take this the wrong way but you remind me of my grandfather. He was an officer in the army and then later went on to be a telephone tower engineer for Bell.
Used to heat up tractor rear axle bearings in motor oil and shrink lock collars by heating them to what I was taught was battleship gray color using oxy/acetylene torch.
Mr Pete! For a fun experiment, make a trough by folding a sheet of paper in half and pour the co2 into it with the trough aimed at a lit candle. I used to do that with co2 from baking soda and vinegar and people were amazed at how the candle would be extinguished while nothing visible was coming from the cup!
Very informative, and should help me in my mechanical dilemma. Thank you!
great video as usual, and yes the sun idea works, i installed head bearings on a motorcycle years ago by leaving the frame in the sun for a few hours , the bearings dropped right in :)
My Air Force ROTC instructor was shot down on that Schweinfurt mission and spent the rest of the war as a POW. "Twelve O'clock High" is a splendid movie about the early years of our daylight missions over occupied Europe; it stars Gregory Peck. Check it out. Mr. Pete, our fathers were part of the "greatest generation" and we're blessed to be raised by such heroes.
Wonderful video. It reminds me of science class in the early 1960s. My favorite airplane is the deHavilland Beaver DHC-2 with the original Pratt and Whitney R 985 Wasp Junior radial engine.
The Schweinfurt Raids were an expensive lesson on the costs of daylight bombing for the USAAF and as it turned out the German's discovered they had greater stockpiles of ball bearings than first thought and were also able to buy in supplies from Switzerland and/or Sweden to make up production shortfalls. It turned out that the Oil Campaign when combined with the cumulative effect of the Transportation Plan, bombing rail, road, shipping along with the pressures of a multi front war and the extra transport required for dispersed production facilities broke the back of the German War Economy. Repeated bombings of oil production facilities greatly reduced the subsequent production and storage capacities after every raid resulting in a growing death spiral till Germany was virtually out of oil or substitutes to make petrol and lubricants to run the various machines required in a modern mechanized war.
Another interesting video. Thanks for sharing.
i've found it at some grocery stores as well...but if you have a welding supply house anywhere in your area, (one that supplies specialty gases and such for welding) they will typically have dry ice for sale as well. (though they tend to have the "pellet" version)
..Doing motorcycles I use my heat gun and infared thermometer and heat the bore to 250 degrees and then insert the bearing..nice video..
Thanks
Hi. You can remove those bearing without causing damage providing you use a press or a jacking method carefully. When one belts the centre of the bearing with a drift it will cause damages.
However I enjoyed this presentation very much.
Thank you.
I'm not smart, just inquisitive.
When I was in submarines, we used to cool down bearings in the freeze box , we stopped doing this because of the condensation causing rust in the housing and the bearings failing. For bearing going on the shaft first, we used a small induction heater; took just a minute. The hard part was installing them in the large end bells - it took forever using a heat gun.
i sure appreciate your videos pete! thankyou!
Hi, Great. The engine cover would heat up along with the bearing so the friction fit would hold and not release. Brilliant.
Seeing is believing and I wish my metal shop teacher had taken the time to conduct a demonstration like this rather than simply do a verbal explanation of what happens because of expansion and contraction relating to the fit between parts. After hearing you mention the Eighth air forces attacks on German bearing manufacturing plants I am reminded that very near where I live in Connecticut - New Departure Bearings in Bristol CT. actually buried stockpiles of extra bearings underground near their plant in case of enemy bombing attacks - if the plant was bombed they had bearings to ship.
The engineering center where I worked used CO2 to cool thermal cycle Chambers. They had a drop line in the garage. If we needed dry ice, we put a canvas bag on the line and opened the valve. Instant dry ice.
Gotta love it when MRPete goes "Off topic" LOL
I can't believe that after the hundreds of videos you have made that viewers think they have to stop to tell what they think you are doing wrong. After all of these videos has he not proved he knows what he is doing? I get mad for you Pete!
simultaneously. thanks. goedendag
Nope,,, we don't argue, the brick shrank, the shaft on the dial indicator shrank, not the bearing. Only kidding. Thanks for another great video. I used dry ice in acetone to shrink a kingpin for my truck,,, it slid right in,,,, no pounding.
👍👍
For anyone interested, AvE has a good video where he heats a bearing up in a microwave oven in order to expand it enough to slide it onto a shaft
the interesting thing to me is that it expands away from the hole instead of the surrounding material expanding in both directions and shrinking the hole
+tim turner That's an interesting thought.
You Sir do a fine job. To hell with the nit pickers.
Great video as usual Mr Pete. I can use these methods within my workplace now with confidence. Quick question, when you put the dry ice on the hot casting, could it crack it?
Thanks for sharing with us.
I was stationed in Schweinfurt in the late 60s, the bearing plant were SKF and FAG which are still in business today.
Thank you, I found that interesting
thanks Mr Pete
I used to get my dry ice at Jack and Jill ice cream distributors. Now Acme markets (may be albertsons near you) usually has it in the front of the store.
Where was Mrs. Tubalcain while you were messing up her kitchen? Was she trying her new toothbrush?
I like the video Mr Pete and i like it when you go off topic always interesting. When I working in the shop I heard the term sweating a bearing on. Is that a proper term and if so could you show how it is done.
Have a day
Some car parts sell a product that freezes the metal up to minus -40. It's under pressure. I did use it and it works well. Also, ice can be brought at welder's compress air dealer. Thanks for showing.
+Robert Patoine
Utiliser un extincteur co2 reformé et une taie d'oreillé pour récupérer la neige.
Vous en trouvez partout des extincteurs co2 "périmé" et pas cher ;)
Bonne idée
I vaguely remember a physics prof telling us that Antimony (Sb) is the only metal which shrinks on heating (or expands on cooling). Any experience with Antimony?
thats a great info thank you very much
I was in the Army and was stationed in Schweinfurt back in the late 80's. I read up on the city's history and the bombing campaign that took place during the war. Remember seeing ball bearing plants in Schweinfurt. Think it was SKF and/or FAG still had plants there.
Thank you, that bombing campaign was very interesting.
Bearings should never be heated too much, even the ones without sealing. INA recommends 100°C for mounting. 120°C should not be exceeded to avoid a loss of strength of the bearing races. In most cases it is sufficient to heat one part to 100°C and to cool the other part in the refrigerator to -25°C.
You need to expand a bearing to put it on a shaft. Bearings Incorporated used to have a movie showing an aluminum funnel on a light bulb to do it.
+koviack You set the funnel on a light bulb and put the bearing on the funnel. The light bulb heats the funnel and the funnel heats and expands the bearing.
+Richard Haisley Doesn't damage the bearing like a torch would. They do make commercial bearing heaters but they are expensive.
Hi Mr. Pete,Have you thought about using one of the $20 infrared non-contacting thermometers? Seems like that would be good to have with the Sterling engines, too.
Near the end of the war the daytime bombing raids were also used to intentionally bait the Luftwaffe fighters into the air so our mustangs could shoot them down. By the time D-day came Germany had no air defense as a result. Chris
+shadowdog500 You are correct about using the bombers as bait, but the D-Day timing is I believe incorrect. the Luftwaffe pulled the majority of fighters out of France for the defence of the Reich.
+Mark Fryer They had to pull all of their fighters to defend Germany by mid 43 because there weren't many fighters left for anything else. The germans lost fighter planes at an alarming rate when our daylight raids began in 1942. In 1943 we were shooting down their fighter pilots faster than they could train new ones. We shot down 141% of the fighter pilots that they started within Jan 43. In the 5 months before D-day daylight bombing raids were resumed, with Mustang escorts, and more than half of the remaining German fighters were shot down as a result. Chris
Great video
I think they are called Applied Industrial Technology now. While I'm thinking about it, we used to have Primitive Pete movies in 8th grade shop class.
Why is it heated in the oven and not just heated in the housing bearing using a torch before dousing it with ice water? What are the risks if we just heat the bearing housing using a torch and then cool it using ice water before inserting the bearing?
I bet that Stirling Hot Air engine would go REALLY fast if you put it on top of the coffee, with a bit of dry ice on the topside.
It's like Mr. Wizard, but for adults!
Hey great job sir thank you
from 12:28 to 12:55 you can hear the whistle of the gas of the torche. You have put out the flame with the CO2, but it seems to continue to propelling the gas. be careful.
+Trevor Burke ah, never mind that guy, Trevor. At first he called it a "lighter thing"..I called him on it, along with his criticism...then he edited it to "torche"..gotta laugh at that.
Another example, when I would change the ring gear around a flywheel that the starter drives I would take the new gear out of the box and set the box on fire. I would then put it in the fire. After good and hot the ring gear would fall onto the flywheel. After it cooled it was tighter than dicks hatband!
How cold do you need to get a shaft in order to slide a bearing over it without a press?
This is awesome
When a machinist wants to make a fit suitable for this technique, how much smaller should the hole for the bearing be?
+Cliff Miller Ha! I should have watched #298 first!
Apparently they use a heating technique for changing the tires on train wheels. Yes, tires. The running surface of the wheel is softer steel to take wear off the rails, and periodically they'll take the wheels off, surround a wheel with a ring of gas torches and heat the tire until it comes off then pop on a new one in the same fashion.
+Alexander Roderick There are some good "old time" videos both British and American showing this being done in workshops on large locomotive wheels using large pin wheel like gas burners. Scarey stuff.
+Alexander Roderick Are you thinking of steam locomotive drivers or are you thinking of European railroad practice? Steam locomotive driving wheels are complicated and expensive to cast and they were cast in cast iron which is less expensive than steel so steel tyres were turned to be heated and set over the cast iron centers which had the spokes, crank pins, and counterweight to cool and shrink onto the wheels to provide the running surface. When this surface and/or flange was too worn the tyre was removed, scrapped, and a new tyre installed bringing the wheel back to new condition without having to recast the center and remachine it. At least one switching railroad uses this technique to save costs in wheel changes due to the sharp curves wearing the flanges very fast compared to over the road diesels.
I believe European railroads use tyres on all equipment to keep from having to press the old wheels off. machine a new wheel to fit the axle then press the new wheel back on to the axle. It is faster to remove the worn tyre, heat the new one and then install the new one to the wheel center than the press off-machine-press on method. These wheels also have a ring installed on the backside of the wheel to help keep the tyre on.
You could put 240 volts arse-backwards through a big 240-110v transformer to get over 400v, control the AC side for simplicity and just rectify the output.
What would be the safest temperature for not ruining your rubber seals?
Tubalcain rules!
Mrpete I thought you and or your followers might be interested in Abom79 video that is just what you have been doing with bearings and but on a very large scale. It is Heavy Metal Machining part 1 take a look at it I think you will enjoy it.
Well there you go.
so would dry ice in water produce sufficient pressure to run a steam engine?
Great vid 👌
mrpete what would be your favorite WW2 plane made?.. mine is the spitfire.. Thankyou sir for sharing
+Kevin Willis I like the b-17 best "flying fort"
+mrpete222 And the B25's toward the end of the war. P.S. Engineers aren't worth their salt without basic common sense, street smarts (learned by hands on and failure)...and good teachers. Thanks Mr. Pete!
+Kevin Willis --- P 51 --- :-)
+OLD WIPPER-SNAPPER i do love the sound of a P51.. but the sound of a V12 rolls royce merlin engine gives me goose bumps.. but that's just me no offence....
+Kevin Willis Yepper! Nothing like it except maybe the sound of a 69' Lamborghini Maura S, wound up. Merlin's are still one of the most beautiful engines ever built, in my book. When they finally got enough in the P-51D it changed the course of the war and aerial combat in Alt/Speed....defeating more than a few ME262's toward the end.
i prefer Co2 extinguishers and have foam ones too. i hate powder ones but will use it on other peoples stuff or when a item is on fire that is fubar. as for the dry ice on the wart, well, most medicine got invented ot improved by experimenting.
Thanks!
Is that a steel cover?
Doubtful. Looks aluminum
Cast aluminum with some machining after casting.
8:41 The reason why so many bombers were lost on the Schweinfurt run was because the target was very deep in Germany, and the bombers did not yet have fighter escort all the way to the target and back. Once the long-range fighters started protecting the bombers, the losses dropped sharply.
🤙
reminds me of Mr wizard. show from the 80s
For what it's worth, I like when you go on a tangent
Mrpete -I am a HUG fan of your videos and I have learned a tremendous amount about machine work & casting so Thank you! but when you said Co2 Fire extinguisher it made me think back to your core video and using sodium silicate (water glass) binder could I use the dry ice & build a set to get the same effect to harden the sand core? I've been looking & thinking of ways to generate Lg amounts Co2 for core making ever since I watched your core video- Two Thumbs Up
+Rosario W What's with the crossed out text?
I wish I knew?- It just posted that way????
+Rosario W Stuck button on the keyboard perhaps or Gremlins in your computer?
I vote Gremlins (haha) I've been having some issues with my lap top it has a mind of its own lately
+Rosario W Maybe the Gremlins inside your laptop are jittery from too much coffee spilled onto the keyboard?
could you power one of your steam engines with dry ice ?
I think you can
Because it is a "expanding" gas that propels the engine
thanks again mr pete im just that little bit more knowledgeable
12:28 The flame goes out... we still hear gas from the torch...
12:55 "Upstairs we go"... gas still running from the torch... good thing he doesn't smoke eh?
+askjerry comments like these are very much like graffiti sprayed on a rail car...waste of time to create, and more of a waste of time to read, eh?
+dale pratt That's ok... Lyle (Tubalcain) gets a chuckle out of them.
good deal, everyone needs a laugh.
Yeah I know what carbon dioxide is. Problem is its not easy to come by in some countries. So what I do is just place the bearings in a plastic bag and put them in the freezer.
Thanks
Johnny Cash, is that you?
You should have moved the bearing to find the high spot, not the indicator
+Kenny Weimann more graffiti...
+dale pratt no disrespect to mrpete, he is part of a dying breed. I worked in machine tool for 13 yrs and am still in mfg for over 33 years. Toolmakers, at least good ones, are getting harder to find. Now where did I put that coaxial indicator???
+Kenny Weimann what I'd really like to see is apprentice programs come back. There are many young kids dying to learn about machining and who better to teach them than the veteran toolmakers.
Kenny, if you meant no disrespect, then show none...I think his resume more than matches your own. I've watched every video he has made, and he knows every correct technique there is concerning machine shop. This was a simple demo about thermal contraction and nothing more. If you want to teach others yourself, congratulations to you, indeed...just start making your own vids and do just that. I'll be the first to subscribe. For you to presume to correct a man who is a second-generation machine shop teacher and former professional machinist himself only shows you haven't taken the time to learn about him...and renders your comment to simple internet graffiti.
Dale, I guess it's just the engineer in me (currently a mfg engineer). I've watched all of his videos. When I saw him moving a non-fixed assembly instead of the bearing against a fixed plane, the light bulbs went off. I'd like to make some videos but working 2 jobs to pay for kids college is keeping me busy. My public apology to mrpete if he took offense, none intended.
If you don't know what dry ice is, your school system has failed you, and you have failed to be intellectually curious. Not sure I've met someone who doesn't know what dry ice is. I hope I haven't.
This vid coulda been 2 minutes long with editing.
WD-40. Drive the old bearing out as you did. WD-40 again, take the new bearing and drive it in using the outer race and a same size socket or bar diameter. Just keep it square. I've done this countless times.
Agr