In the Foundry and the weld shop, the Navy provided us with electric ovens that got as hot as 900 degrees F but until they installed the ovens we had some "old school" methods of preheating castings and assemblies. In the case of what you just brazed, we would preheat the casting by filling the void with charcoal (after all prepping was completed of course) light the charcoal then wait for the charcoal to be cherry red then the repairs would commence. This not only saved us the cost of using a torch to heat up the casting but it evenly heated the casting through out the mass to prevent intersticial cracking and when the project was completed, we allowed the coal to slowly die off which kept the casting from cooling too quickly and forming areas of stress. If you have more project like this one, this method might help!
I watched a video on one of the Pakistani channels where they preheated a engine block for repair by building a bonfire over it. Necessity is the mother of invention.
Considering how large this work-piece is the charcoal idea sounds like a good solution to heating it to working temperature uniformly and maybe even keeping it hot while it is being brazed. A 20 lb. bag should do it. Then when the work is finished the work piece could be left in the coals to cool down stress free while the coals burn out.
Rebuilding or making repairs to broken forging and stamping press cranks (think large ~10' long with 16"-18" journals): If not broken in two pieces the cracks are gouged out to good base material. the regional area is uniformly heated and two welders will begin to rebuild the crank from opposite sides. Welders are using flux core wire and have to coordinate timing and placement of beads. Once complete an oven is built around the welded area. For this example a cube 48" x 48" x 48" is loosely put together out of corrugated steel and filled with wood and charcoal ~64 cuft. Someone lights it off and it is tended round the clock till she burns out. The process is to stress relieve the material. Same process is applicable to any large component. I'll try to post a photo and link it here.
Hey Keith, I deal with round channel letters and sign cabinets all the time. I learned a long time ago that when you're dealing with 2 sawhorses like that, it really helps to run a strap to keep them from spreading apart. Eventually, I made a 12" latch at both ends out of a piece of flat steel and studs. Works wonders! Figured I'd tell you my little trick, it's saved my toes more than once
Here you demonstrate every brazing attempt i have ever been in on - trial and error with all the various tools at ones disposal. Let the material guide ya as to how it wants to take -or doesnt. Very good of you to show the honest truth … every attempt is a challenge all its own and just working it thru with ideas and practice is what gits rrrrrrr dun! Great video and great work. I was taught to stop drill the end of a crack but others choose to grind cracks out entirely. I wonder which most people choose?
Thanks for the education, Keith. I have something that needs to be brazed and I haven’t brazed anything in 35 years, but your clear descriptions of what you are doing and why have been building my confidence to the point that I will probably try to do the repair myself. Good content!
Hey, Kieth! If you want to save your torch gas and do better fast heat up of parts. Get you a propane weed burner wand to turn up high and blast the part big flame works well and fast!!!! Can even leave burner on part to keep hot as welding just turn down a little!
The brazing of cast iron never gets old. That was a big challenge and turned out nice. I was waiting to see if you chucked that big thing up on the lathe like they do on the Pakistan truck channel!
I appreciate you showing us all the goof ups, too many videos are edited to smithereens and you'd think guys never make a mistake. Moreover that looks like a good strong repair.
The old double Kt fracture... Also known as a stress riser. They did some amazing mechanical design work back then given the technology of the day. We have learned so much over the years about the dos and don't of engineering... We stand on the shoulders of giants... Very Cool project. A generous radius in those corners may have saved that casting from a crack.
For heating a large casting some Kayo wool insulation and a propane weed burner is very efficient in cost, time and effectiveness. You can literally get the whole casting glowing cherry red if you so desire. It isn't really necessary to do that of course to braze but it will allow you to get a good heat in the entire part before you start on the repairs and to warm it up if you lose heat.
19:18 was thinking - sure hope he has those saw horses clamped together. Good on you for showing what not to do. Reminds me of when we accidentally picked up parts before they fully cooled - "sure don't take long to look at horseshoes".
In my much younger days, I swept floors in an old school job shop (got in the way more than anything really). They used to get BIG gears all the time. Most were from very large old school punch presses. Most were more than 4-5' in diameter. I used to help build the "furnace" using fire bricks around a big section of the gear, sometimes the entire gear. Large propane torches were used to heat the gear. They would frequently let them burn all night to get them up to temp. This was obviously after they prepped the crack or missing tooth area by spending hours grinding. When the gear was up to temp, out came the OA torch. They didn't mess with single large tips, they went right to the rose bud tips.The brazing rod must have been at least 1/4" in diameter, maybe bigger. They sometimes had to do complete build ups of a missing tooth. Once the brazing was done, the gear was moved to a huge lathe to clean up the outside and sides of the tooth or repaired area. Before it could be moved, it had to cool slowly under fire blankets and layers of insulation. I wish I could remember how they did the tooth faces, Regardless, the whole process was really neat and took numerous days to complete.
Great job Keith, not an easy piece of metal. I think I would have tied the horses together at each end to keep them from separating, just a thought. Thanx for sharing.😃
Have you tried brazing using the cutting torch tip? It has a more concentrated flame than a rosebud and puts out more heat than a welding tip. My dad always used the cutting torch when brazing heavier cast parts that needed a lot of heat.
Given some of your more difficult brazing jobs you've been handling doesn't your wife need a new oven? I mean...PERFECT excuse to get the old oven in the shop, and she gets a new oven. Of course that new oven comes with a new Kitchen, but hey...LOL.. Nice job Keith, can't say I didn't see the drop of the roller though, I saw that one coming a mile away. LOL. Glad you're OK after that, kind of scary!
Great one. I was almost going to skip. (Another brazing video...), but man, you always make it interesting. I was half wondering if you were going to stick that beast on a lathe to clean it up! (Do you have a lathe that is hefty enough to handle something that big? )Also, was on the edge of my seat when you were repositioning with the welding blanket. Great drama! I'm glad you were not hurt when it fell!
When I have to heat a large part like this I use a propane weed burner, since you don't need the high temperature of the torch for the preheat and the weed burner is a large spread out heat source you can preheat a lot cheaper and sometimes faster since the larger area of cooler flame lets you get more aggressive with the total heat going into large parts at once, you can also set the propane burner under the part on low heat to keep heat in the parts further away from your work area. I guess you wouldn't be able to use this method in tightly enclosed spaces though, due to CO and other concerns, but it works great with good ventilation.
If you were doing a lot of this kind of work you could get a pottery kiln for pre heat and post heat for stress relief but they are not cheap , even used .
I brazed up a broken handle for my vertical mill and was hoping like in soldering if i got some flux down in the crack area that i could not grind out would it "flow" into that area? like the way solder will "wet " into the metal... nicw job by the way..i learn a lot of brazing and other tips from your channel.
Here in Arizona, we just place the part out in the sun for a few minutes for Pre-heat treatment, then Braze it, for more difficult projects, we just leave it out a while longer and it melts right back together!
A firebrick brazier is mentioned below. I wondered about that as you started. I disagree though on his conclusion. I've seen heavy pieces like that in service for literally decades after the repair. If it doesn't fail in the first hour it likely won't.
I’m not a machinist, but I was a mechanic for many years. I would have ground off that hideous flashing!!! Guaranteed more cracks will grow from those stress risers. That’s even worse than the 427 SOHC Ford block castings, which had the worst I’d ever seen in a running engine.
With a part that big you need a coal fire to get it thoroughly heated. That’s the way it was done in the old days way before we were born. Hopefully we’ll get some feedback a few years down the road to see how well they held up.
A better tool to create your weld prep would be to use carbon arc, given your welding skills this would be faster and reach further into the parts that a grinder. It would also have a benefit of imparting some heat. great work thanks Richard
Any foundry man or pattern maker looking at that would just shake their head and sigh. Most of that cracking has its origin in poor design. Heavy section, light section, no provision for contraction across those four ribs. If they had just designed it with three ribs instead of four it would probably not need repair even now. 😢
@@dye8287 I think Gordon is right about the design flaws, but agree with you that it's too easy to criticize the past when looking through a modern lens. That cane mill is probably closer to 100+ years old, and made in a small, specialty foundry, as it's a highly reginal product.
If you think at the same time that piece of a rubbish casting was made vast machine tools were being produced from the 1870's onwards. Such a simple thing designed horribly and poorly made and finished. Probably crap cast iron too.
Say what you will about poor design, but clearly the design focus was to make an adequate, inexpensive product, good enough for the job it was built for, for a reasonable lifespan. I’d say this product met that requirement. Nobody deliberately engineers something like this to last 100 years.
Looked like there was a very worn bearing journal on that shaft that maybe could have used turning down or building up and turning down. I wonder if using a couple of carbon blocks as dams on either side of those webs would have made the brazing easier? It could have kept the braze from leaking out with higher heat.
A better way to repair cast iron with gray iron rod. Most welders don't know about it but my boss has been using it for many years and thinks it's far better than brazing. Try it out.
Did you drill a hole where it ended on the face of the cylinder? My Maternal Grandfather said always drill a hole at the end of the crack to keep it from cracking any farther.
Would the clay play-doh stuff you use to dam up openings when you pour babbet help to keep your braze from slumping down the sides? Also, do you normally use that powdered flux when you’re brazing?
Brazing , like oxy/fuel welding, should be possible in all positions with the proper tip. Extra flux is needed in brazing cast iron due to the graphite in the iron.
@@millwrightrick1 Silicone-Bronze is very fluid when up to the proper temperature. It's allot harder to control out of position than in position. If you get it hot enough to penetrate into the parts, it's also hot enough to flow everywhere. If you're working against gravity, it becomes that much more difficult.
Keith, I notice that you wear a Philmont belt. Were you a Boy Scout? I'm 69 and my brother is 73, we were both Eagle Scouts back in the day. I love your videos. Thanks as always.
Wouldn't it be a good idea to drill the end of the crack of the drum before heating for the top repair? This should limit the crack opening to a minimum.
On the intial grinding, the crack and the grind only went part way down. On the final pictures, after the repair, the braze went all the way down. It might have cracked the rest of the way due to not having a hole drilled at the end of the crack. ???
Very interesting repair! I wonder if gouging rods would be helpful at getting into those hard to reach places with the angle grinder. Or would those heat up the casting too much as they gouge away material?
Cast iron/steel tends to harden from electric welding (faster heating?) And I think cast iron has quite a bit higher melting temp. than mild steel, just my 2 cents.
If I were you kieth immediately after getting the roller repositioned, “Here we have this crack that was definitely not created by it falling on the floor.”
a lot of gas and a lot of brass on this one. Do you always use the prefluxed rods? I find them very expensive here in Australia, close to $10 each, so I almost always use bare rod and dip in flux when brazing.
How was this roller damaged the way it was? The location of the cracks leads me to think that it was dropped or something. To much torque on the shaft?
You're a braver man than me Keith, that roller has been seriously abused in it's time and is cracked everywhere. I wouldn't have touched that job. Simply not worth the time, gas and future trouble it may bring into the shop!
It's a roller running at low stress and extremely low speed, as noted in the video, it probably would have been OK even without fixing it. If it fails completely, at most, it annoys the mule. Everyone surely understands that these old cane mill are used for historical recreations, not real industrial sugar production, right?
its a shame you cannot lay down some sort of a ceramic first. like to cast a plaster or a fire putty / fire cement to make a dam on either sides. or even somethiing else like a clay or concrete or sand whatever might work idk. for the heat loss you also kindda want the main body of the part half sitting over a fire or a furnace maybe? but it would need to be at an even and controlled temperature. all pretty challenging i cannot really fathom
Keith just 🤔🤔you could for future projects like this one MIY cheap refractory oven. Using a roll of refractory wool and a propane weed torch placed in a 6" deep dirt pit in a metal trash can or large dia scape pipe piece and a stand for the part. 👍👍👍👍👍👍
![What's in the box?! 1890s Safe [Restoration]](http://i.ytimg.com/vi/kugqGatwLDY/mqdefault.jpg)
In the Foundry and the weld shop, the Navy provided us with electric ovens that got as hot as 900 degrees F but until they installed the ovens we had some "old school" methods of preheating castings and assemblies. In the case of what you just brazed, we would preheat the casting by filling the void with charcoal (after all prepping was completed of course) light the charcoal then wait for the charcoal to be cherry red then the repairs would commence. This not only saved us the cost of using a torch to heat up the casting but it evenly heated the casting through out the mass to prevent intersticial cracking and when the project was completed, we allowed the coal to slowly die off which kept the casting from cooling too quickly and forming areas of stress. If you have more project like this one, this method might help!
I watched a video on one of the Pakistani channels where they preheated a engine block for repair by building a bonfire over it. Necessity is the mother of invention.
Considering how large this work-piece is the charcoal idea sounds like a good solution to heating it to working temperature uniformly and maybe even keeping it hot while it is being brazed. A 20 lb. bag should do it. Then when the work is finished the work piece could be left in the coals to cool down stress free while the coals burn out.
Rebuilding or making repairs to broken forging and stamping press cranks (think large ~10' long with 16"-18" journals): If not broken in two pieces the cracks are gouged out to good base material. the regional area is uniformly heated and two welders will begin to rebuild the crank from opposite sides. Welders are using flux core wire and have to coordinate timing and placement of beads. Once complete an oven is built around the welded area. For this example a cube 48" x 48" x 48" is loosely put together out of corrugated steel and filled with wood and charcoal ~64 cuft. Someone lights it off and it is tended round the clock till she burns out. The process is to stress relieve the material. Same process is applicable to any large component. I'll try to post a photo and link it here.
@@davemaccarter64 and you can cook some smokies while you are waiting.
Same story - used a 55 gal drum to hold cast iron oil pan off antique tractor. Remember it still being a pain because of thin cross sections.
My brazing skills have improved since watching your videos and your commentaries while performing the task. Thank you
Hey Keith, I deal with round channel letters and sign cabinets all the time. I learned a long time ago that when you're dealing with 2 sawhorses like that, it really helps to run a strap to keep them from spreading apart. Eventually, I made a 12" latch at both ends out of a piece of flat steel and studs. Works wonders! Figured I'd tell you my little trick, it's saved my toes more than once
excellent work keith, im glad you didnt edit out dropping the part on the floor, and talk about running out of gas. keeps the channel real. thanks.
And almost losing a thumb. That was a WATCH OUT FOR EVERYTHING THAT CAN BITE YOU vid. Gloves are a potential risk.
Keith grinding & brazing;
Folgers in my cup--a super start to the week.
Keith seems to be on a "roller" coaster.
Great video Keith I loved that you showed it falling u could have edited it out but u didn’t just shows your human stuff happens to us all!
Here you demonstrate every brazing attempt i have ever been in on - trial and error with all the various tools at ones disposal. Let the material guide ya as to how it wants to take -or doesnt.
Very good of you to show the honest truth … every attempt is a challenge all its own and just working it thru with ideas and practice is what gits rrrrrrr dun!
Great video and great work. I was taught to stop drill the end of a crack but others choose to grind cracks out entirely. I wonder which most people choose?
Fair play to you for including the bits where it doesn't go so well. Great job.
THANKS KEITH
Thanks for the education, Keith. I have something that needs to be brazed and I haven’t brazed anything in 35 years, but your clear descriptions of what you are doing and why have been building my confidence to the point that I will probably try to do the repair myself. Good content!
Hey, Kieth! If you want to save your torch gas and do better fast heat up of parts. Get you a propane weed burner wand to turn up high and blast the part big flame works well and fast!!!! Can even leave burner on part to keep hot as welding just turn down a little!
Keith you are a very lucky man that did not drop on your feet or leg . please take care we need you to post videos
The brazing of cast iron never gets old. That was a big challenge and turned out nice. I was waiting to see if you chucked that big thing up on the lathe like they do on the Pakistan truck channel!
I appreciate you showing us all the goof ups, too many videos are edited to smithereens and you'd think guys never make a mistake. Moreover that looks like a good strong repair.
The old double Kt fracture... Also known as a stress riser. They did some amazing mechanical design work back then given the technology of the day. We have learned so much over the years about the dos and don't of engineering... We stand on the shoulders of giants... Very Cool project. A generous radius in those corners may have saved that casting from a crack.
The "S" shaped spokes on old cast iron pulleys were not decorative. They minimized the stresses that cooling the part caused in the casting.
"That...was not the plan." Story of my life! 😂
That one's a hernia maker! Nice work.
For heating a large casting some Kayo wool insulation and a propane weed burner is very efficient in cost, time and effectiveness. You can literally get the whole casting glowing cherry red if you so desire. It isn't really necessary to do that of course to braze but it will allow you to get a good heat in the entire part before you start on the repairs and to warm it up if you lose heat.
That was certainly a challenging project. I really enjoy you videos and the knowledge that you share with us. Thank you very much for sharing.
Thanks Keith, I would not have had the patience or the skills to do that. I hope the owner compensated you for all of the extra experience.
Excellent as always.
19:18 was thinking - sure hope he has those saw horses clamped together. Good on you for showing what not to do. Reminds me of when we accidentally picked up parts before they fully cooled - "sure don't take long to look at horseshoes".
Heavy casting, more brazing. Gotcha!
In my much younger days, I swept floors in an old school job shop (got in the way more than anything really).
They used to get BIG gears all the time. Most were from very large old school punch presses. Most were more than 4-5' in diameter. I used to help build the "furnace" using fire bricks around a big section of the gear, sometimes the entire gear. Large propane torches were used to heat the gear. They would frequently let them burn all night to get them up to temp. This was obviously after they prepped the crack or missing tooth area by spending hours grinding. When the gear was up to temp, out came the OA torch. They didn't mess with single large tips, they went right to the rose bud tips.The brazing rod must have been at least 1/4" in diameter, maybe bigger. They sometimes had to do complete build ups of a missing tooth. Once the brazing was done, the gear was moved to a huge lathe to clean up the outside and sides of the tooth or repaired area. Before it could be moved, it had to cool slowly under fire blankets and layers of insulation. I wish I could remember how they did the tooth faces, Regardless, the whole process was really neat and took numerous days to complete.
Great job Keith, not an easy piece of metal. I think I would have tied the horses together at each end to keep them from separating, just a thought. Thanx for sharing.😃
Have you tried brazing using the cutting torch tip? It has a more concentrated flame than a rosebud and puts out more heat than a welding tip. My dad always used the cutting torch when brazing heavier cast parts that needed a lot of heat.
Wow, those were some serious cracks. Glad to see you got it done.
You have so much more patience than me. I was praying that this wouldn’t turn into a two part video. 😅
You do great job on your brazing..i would melt the rod with the pool instead of putting flame directly on welding rod..it makes a smoother weld..
challenging job there Keith, well done
The Liberty bell! Thanks for sharing.
A propane tiger torch helps get the heat in to the past, it's also easier on the acetylene to only use the brazing tip.
Thank you for sharing.👍👀
An encouragement to us all. Thanks for instruction!
Tell your customer about Clark at Windy Hills Foundry. If it cracks again, a new casting should be considered. Great Job. Thanks
Given some of your more difficult brazing jobs you've been handling doesn't your wife need a new oven? I mean...PERFECT excuse to get the old oven in the shop, and she gets a new oven. Of course that new oven comes with a new Kitchen, but hey...LOL..
Nice job Keith, can't say I didn't see the drop of the roller though, I saw that one coming a mile away. LOL. Glad you're OK after that, kind of scary!
Great one. I was almost going to skip. (Another brazing video...), but man, you always make it interesting. I was half wondering if you were going to stick that beast on a lathe to clean it up! (Do you have a lathe that is hefty enough to handle something that big? )Also, was on the edge of my seat when you were repositioning with the welding blanket. Great drama! I'm glad you were not hurt when it fell!
When I have to heat a large part like this I use a propane weed burner, since you don't need the high temperature of the torch for the preheat and the weed burner is a large spread out heat source you can preheat a lot cheaper and sometimes faster since the larger area of cooler flame lets you get more aggressive with the total heat going into large parts at once, you can also set the propane burner under the part on low heat to keep heat in the parts further away from your work area. I guess you wouldn't be able to use this method in tightly enclosed spaces though, due to CO and other concerns, but it works great with good ventilation.
excellent weld. If this wasn't 1 mule power, i would suggest drilling and pinning with 5/16 hardened rod, but you got this done right
Great video Keith, keep'um coming..
Amazing job👀.....Thanks Keith 👍
Shoe🇺🇸
If you were doing a lot of this kind of work you could
get a pottery kiln for pre heat and post heat for stress relief
but they are not cheap , even used .
I brazed up a broken handle for my vertical mill and was hoping like in soldering if i got some flux down in the crack area that i could not grind out would it "flow" into that area? like the way solder will "wet " into the metal... nicw job by the way..i learn a lot of brazing and other tips from your channel.
Thanks for the video Keith, quite a few dollars worth of gas on this project
19:19 Ouch. Glad you weren't hurt. Steel toed shoes ftw.
Here in Arizona, we just place the part out in the sun for a few minutes for Pre-heat treatment, then Braze it, for more difficult projects, we just leave it out a while longer and it melts right back together!
Good stuff
Wow... did you ding the floor? Crane just paid for itself again.
Good video Keith. Did these "kits" still use babbit bearings? Seems like a lot for a farmer to cobble together. Thanks again.
Hey Keith, I am curious why you didn't drill out the end of the cracks. Perhaps it wouldn't do much good in preventing them from propagating?
Something that big... you could set it up on a gas fired fish-fry burner and heat soak it pretty good.
A firebrick brazier is mentioned below. I wondered about that as you started. I disagree though on his conclusion. I've seen heavy pieces like that in service for literally decades after the repair. If it doesn't fail in the first hour it likely won't.
I’m not a machinist, but I was a mechanic for many years. I would have ground off that hideous flashing!!! Guaranteed more cracks will grow from those stress risers. That’s even worse than the 427 SOHC Ford block castings, which had the worst I’d ever seen in a running engine.
With a part that big you need a coal fire to get it thoroughly heated. That’s the way it was done in the old days way before we were born. Hopefully we’ll get some feedback a few years down the road to see how well they held up.
Looks like it could use some shaft repair as well. That is a hard part to braze with the mass.
When those saw horses started spreading I was thinking :"Don't drop it on your foot!"
thought about using a gas hob to heat the castings? aside from that, i guess you're gonna have to weld on some chain stays for your saw horses.
A better tool to create your weld prep would be to use carbon arc, given your welding skills this would be faster and reach further into the parts that a grinder. It would also have a benefit of imparting some heat. great work thanks Richard
Would that work on cast-iron though? You can't cut cast iron with a torch. I wonder if carbon arc would cut through it either?
@@24681359David Yes the arc melts the material and the air pressure blows it away.
Great brazing work but I thought for sure you would have the saw horses clamped together.
We used to call the braze “pasty” when it was melted but not thin like water.
I hope Keith is being handsomely rewarded in the form of cane syrup.
He can use it to make Ice Cream !!!
Years ago I used an asbestos based damming material, can you use the material that you use for babbet bearing pours to do the same thing?
Know an old timer that uses an induction cooking hob to pre heat his cast iron weld jobs.
Noticed small crack that delaminates outer teeth from inner ring where you fist brazed. Looks previously welded and stresscracked.
Any foundry man or pattern maker looking at that would just shake their head and sigh. Most of that cracking has its origin in poor design. Heavy section, light section, no provision for contraction across those four ribs. If they had just designed it with three ribs instead of four it would probably not need repair even now. 😢
Not trying to disagree, but I feel this is easily said some 50+ years in the future.
@@dye8287 I think Gordon is right about the design flaws, but agree with you that it's too easy to criticize the past when looking through a modern lens. That cane mill is probably closer to 100+ years old, and made in a small, specialty foundry, as it's a highly reginal product.
I agree, even if the design was made 100 years ago, it was subpar at the time.
If you think at the same time that piece of a rubbish casting was made vast machine tools were being produced from the 1870's onwards. Such a simple thing designed horribly and poorly made and finished. Probably crap cast iron too.
Say what you will about poor design, but clearly the design focus was to make an adequate, inexpensive product, good enough for the job it was built for, for a reasonable lifespan. I’d say this product met that requirement. Nobody deliberately engineers something like this to last 100 years.
Looked like there was a very worn bearing journal on that shaft that maybe could have used turning down or building up and turning down.
I wonder if using a couple of carbon blocks as dams on either side of those webs would have made the brazing easier? It could have kept the braze from leaking out with higher heat.
A better way to repair cast iron with gray iron rod. Most welders don't know about it but my boss has been using it for many years and thinks it's far better than brazing. Try it out.
Did you drill a hole where it ended on the face of the cylinder? My Maternal Grandfather said always drill a hole at the end of the crack to keep it from cracking any farther.
Curious when we will see more about the stoker engine. Last I heard Adam Booth gave up on it.
Keith: I am curios if it would be helpful to drill a hole at the end of a crack to keep it from running any more?
Would the clay play-doh stuff you use to dam up openings when you pour babbet help to keep your braze from slumping down the sides? Also, do you normally use that powdered flux when you’re brazing?
Brazing , like oxy/fuel welding, should be possible in all positions with the proper tip. Extra flux is needed in brazing cast iron due to the graphite in the iron.
You stole my question. Well the first question.
@@millwrightrick1 Silicone-Bronze is very fluid when up to the proper temperature. It's allot harder to control out of position than in position. If you get it hot enough to penetrate into the parts, it's also hot enough to flow everywhere. If you're working against gravity, it becomes that much more difficult.
Keith, I notice that you wear a Philmont belt. Were you a Boy Scout? I'm 69 and my brother is 73, we were both Eagle Scouts back in the day. I love your videos. Thanks as always.
Wouldn't it be a good idea to drill the end of the crack of the drum before heating for the top repair? This should limit the crack opening to a minimum.
On the intial grinding, the crack and the grind only went part way down. On the final pictures, after the repair, the braze went all the way down. It might have cracked the rest of the way due to not having a hole drilled at the end of the crack. ???
Very interesting repair! I wonder if gouging rods would be helpful at getting into those hard to reach places with the angle grinder. Or would those heat up the casting too much as they gouge away material?
Cast iron/steel tends to harden from electric welding (faster heating?) And I think cast iron has quite a bit higher melting temp. than mild steel, just my 2 cents.
@@moparlarsson Oh very good point! That seems like some pretty sound logic.
You know that material you use to dam up for pouring babbit? Could you not use that to make a dam to keep the braze under control? Just a thought.
I'm curious to ask why you didn't drill the end of the cracks to stop them from starting up again?
Eric
If I were you kieth immediately after getting the roller repositioned, “Here we have this crack that was definitely not created by it falling on the floor.”
That must have been some mule to crack that roller.
You said for PRI heat and cool down "take a little Willie" so that's about the same amount of time correct?
Very entertaining
A propane weed burner would be great to preheat parts, cheaper too.
Ive always wondered if on these large pieces one of those propane weed torches wouldn't be the way to do a preheat vs oxy acetylene???
Have you ever considered spray welding for repairing cast iron, such as a stoody torch.
Hi Keith, why don't you made a role in the end of the big crack to stop it?
a lot of gas and a lot of brass on this one. Do you always use the prefluxed rods? I find them very expensive here in Australia, close to $10 each, so I almost always use bare rod and dip in flux when brazing.
How was this roller damaged the way it was? The location of the cracks leads me to think that it was dropped or something. To much torque on the shaft?
Damn kids probably hooked two mules to it and over reved it. Kids these days, always after more mulepower.
@@paulcopeland9035 🤣🤣🤣🤣
Maybe setting it in an old pottery kiln would work for preheating it.
would it be worth useing an arc gouge?
3:03...THOSE ARE THE BREAKS-(?)
(get it? get it? get it? snucker-snucker-snucker-snucker!!!)
how would using a turky fryer burner set part on it and then braize it
Great 👍 👌
You're a braver man than me Keith, that roller has been seriously abused in it's time and is cracked everywhere. I wouldn't have touched that job. Simply not worth the time, gas and future trouble it may bring into the shop!
It's a roller running at low stress and extremely low speed, as noted in the video, it probably would have been OK even without fixing it. If it fails completely, at most, it annoys the mule. Everyone surely understands that these old cane mill are used for historical recreations, not real industrial sugar production, right?
No argument about its function
Just wouldn't take it as a job in my workshop!
The bearing shaft looks kinda rough for a bearing surface?
its a shame you cannot lay down some sort of a ceramic first. like to cast a plaster or a fire putty / fire cement to make a dam on either sides. or even somethiing else like a clay or concrete or sand whatever might work idk.
for the heat loss you also kindda want the main body of the part half sitting over a fire or a furnace maybe? but it would need to be at an even and controlled temperature. all pretty challenging i cannot really fathom
Any bigger and you'd need to dual wield.
19:19- saw that coming.
Why didn't you say something? A man who can predict the future is very valuable!!
In hindsight, couldn't a drill have been used to drill out the web crack?
Could you use your fordge and a sheet metal tent to help preheat the part?
"fordge".....Is that a Ford or a Dodge?
@@paulcopeland9035 auto correct is not my friend
Keith just 🤔🤔you could for future projects like this one MIY cheap refractory oven. Using a roll of refractory wool and a propane weed torch placed in a 6" deep dirt pit in a metal trash can or large dia scape pipe piece and a stand for the part. 👍👍👍👍👍👍
To prevent the filler metal from running all over the workpiece, why not make a dam with the damming material you used for pouring Babbitt?