Given that the request was to return to a "good" condition, one can extrapolate that Stefan's definition of "good" would be most peoples definition of perfect. Watching these uploads is like being invited to a world class lecture, the most enjoyable and educational content on TH-cam.
There are people with horrible skills, then people with some skills, then people that are good , then people that are really good and then there is Stefan's level . Amazing work Stefan 👏👏👏
@@zumbazumba1 Tom is excellent but Robin Renzetti works in jaw dropping detail when it comes to overall skillset as a toolmaker. Robin is also a master in his craft with eyeball deep nerdology. Stefan is excellent in his own right and has many more years ahead of him to grow. That being noted, Stefan is VERY good at his craft and shares much insight, sans any "bob's your uncle".
@@zumbazumba1 Is Tom Lipton really considered "more precise" than Stefan? Do other people agree with that? Genuine question. I am too ignorant in machining to have an opinion.
Obviously you can tell Stefan has seen it, but for anyone who hasn't I do want to suggest people look up Robin Renzetti's video rebuilding his mill spindle, all of Robin's videos are excellent
If you see what drills they actually use to perform brain and spine surgery you will be dissapointed. I didn't know how crude these surgeries were until my spinal surgery failed and I ended up learning the nitty gritty myself (in the time of the internet one can just attend medical specialty schools like neurology, neurosurgery, radiologist and orthopedic without actually being a student there as long as you don't perform surgery on anyone who is alive) after a dozen doctors failed to see the obvious signs that other doctors were too ashamed to admit they missed too.
A suggestion for an option other than the double nitriles I learned from grilling use - cotton gloves inside the nitriles. It provides a really nice insulation layer while maintaining the dexterity you need and still costs next to nothing.
yes ! what he said ! we are so fortunate to have you on TH-cam. You are always in some topic discussion around our round table in our shop thank you for that. regards Skip
Thanks to this video, I learned two things, besides how to put a drill press spindle together 😉 1. I learned why and how you preload bearings on a shaft. 2. Faber-Castell makes more than art supplies. I never knew they made stuff for machinists. I happen to like their PITT brush pens.
@@jimsvideos7201 you don't really need ceramics to cut kevlar, just make a quite rough 90 degree grind on decent steel scissors and they will cut kevlar just fine, rough texture helps holding the fibers from slipping out of the V, 90 degree grind is the magic ingredient they won't last as long of course, but in a pinch it works very well on this tough bendy stuff
Some TH-cam Creators attempt to conceal their intellect for the purpose of humor, some just modesty. Your abilities and intelligence show brightly without effort on your part, and you frequently perform work outside and beyond Paradigms. Very awesome to observe your approach to improvements and enhancements to machines and components. Not a dull or boring subject to be fair, but cool none the less. Thanks for posting!
Excellent education in the finer parts of machining and tool making! Thank you for your constant precision and for your detailed explanation and commentary! You are the finest machinist/educator I have found on you tube and I aspire to achieve 1 tenth of your skill on my own projects!!!
Hi Stefan, Since I recently purchased a TB 10, I came across this video two days ago. By now I must have watched at least half the videos you have posted. Which means on Monday I‘ll be through.... very impressive whats possible in a basement shop. You really accumulated some serious equipement. I‘ll definetely get in touch with you about my spindle.
Beautiful job Stefan! It's worthy work to restore a well built machine to full service, preserving all the work the original makers put into the rest of the machine and allowing it to continue to serve :)
I thoroughly enjoy your videos. Seems each time I learn something new. This time it was the hint about steel wool. I was never taught there was a good way in a wrong way. Thank you. Your pointer long time ago about CRATEX has improved many a part!
I enjoy your channel , you are one of the few who have an understanding of what you're doing. To qualify that, I am retiring soon as a mechanical engineer and a class A tool maker in my own precision mold / job shop. I just don't know why all the TH-cam machinists turn their grinder spindles off after they dress them. Once you dress a wheel it is in dynamic balance and should not be shut off till grinding is complete. I have over 40 years experience in high precision grinding. Everything we do is in the micro range. Take it for what it's worth.
Funny I got bit by the hot bearing a few videos back when I was working on the valve grinder spindle and now you got the same thing. Makes me feel better about my oops. 😂 Might you should have ground a little off the end so no danger of the spindle end bottoming out before it reaches the taper? Seems that could possibly be an issue.
Very nice job on the rebuild. Thank you for taking the time to bring us along, and show us how a craftsman repairs a spindle. That drill press has probably never been so smooth. As always, Thank You for the lessons learned. Take Care and Stay Safe. Bob
I always love watching you go to the a level of precision just beyond what is necessary. Thank you for explaining all of your decisions. Great video, THANKS!!!
I took an old junk Taiwanese drill press that someone was giving away. It had a Jacob's taper 2 1/2 on the spindle. I successfully converted the spindle over to JT6 and put a keyless chuck on it. Great usefull tool in the shop now. That was my first time to use the taper attachment that came on my Logan lathe.
Thanks I enjoyed this video. I also figured out what to do with my old NiCad Cordless Drill. I have a old bench top Canedy-Otto drill press with external taper. Someday I will get around to restoring it. I measured run out with a indicator in a chuck relative to the bed and it was pretty much spot on. The only problem is the chuck sometimes falls off because the taper is a little beat up. I am checking eBay because I am thinking about replacing with a internal taper because I have a lot or taper shank drills. Thanks again.
Great Job Stefan!!! very satisfying as always. I have a drillpress that I'd like to rebuild the spindle on so Ill definitely be watching this one more than once!
Stefan, I am always amazed by the high quality of the work you do! You may have exceeded NASA specifications on this spindle. I cannot thank you enough for what I am learning from your videos. I completely understand your comment about how much fun this work is. Sadly, I think we will be losing a great deal of the knowledge craftsmen like you possess since too many children today are afraid to get their hands dirty. :-(
I really liked how You did the tapered grinding just indicating it in. Great result. The axial load of a groved bearing is quite good, best for deep groved ones. Had several arguments with people on this, its in the data sheets. I think the issues people have are more from improper alignment and pre load. And sometimes over lubricating which causes heat problems.
Thank you for another great video. Your work habits are always spot on and that is the way any young machinist should learn the craft from the start of his quest to be good at what he/she does all thru life.
Tip: When deburing/polishing a journal, shaft, etc, then us a 321 block, or a parallel with a piece of wet and dry abrasive paper(with/without light oil) instead of a stone. Works faster, cleaner and saves on irregular slip stone wear. 321 blocks are best as the holes act like reliefs and holds the grinding sludge away from the interface.
Nice Job! I did the same thing for my old Flott, but on the lLathe with a support grinder. It was OK, but not as sophisticated as your job. An old and very experienced mechanic that was reparing old drill presses once told me that the deformation of these tapers normally come from a slipping chuck on the taper. When the chuck slipps, the higher points get warm and harder than the rest of the taper.. When the chuck slips again, the harder points will remain and the softer parts will wear a bit more. You can't remove the hard tips with a simple honing stone then and you need to grind it with a grinding wheel, like you did.
yes i caught a 1 in drill bit in a work piece and bent our drill press (visibly), yey that back bearing was pretty rough sounding, the axle bearing on a john deere 4430 uses a hot install course its a 4 in axle shaft, cool job my first time watching
Excellent. Step by step demonstration with clear discussion of each detail. There's a world of teachers who could benefit from your example. But! The center hole in the taper end is now out of concentricity with the spindle axis. That might mislead the guy who replaces the bearing in 2089. My solution would be to chuck the spline in your lathe, support the quill barrel in the steady rest, and fine tool the center hole back to concentricity. It'll only take a few minutes. A trivial refinement but since we tend to take undamaged reference features as Gospel it couldn't hurt.
@@forrestaddy9644 No, sir -- sorry. Stefan did a stellar job, with runout down in the micron region (which would be 0.000039 inches... 39 miillionths...) and my conclusion would be that he's both very bright and very skilled, as well as possessing excellent judgement. I suspect that if he thought the center hole had any significance, he would have addressed it. I wouldn't have been surprised, but neither am I surprised that he ignored it. It hit me oddly that you would think the best response would be to pick up this arguably inconsequential detail. I think the best way for you to show your perspective on the matter would be to... show your perspective on the matter! :) Clearly you would have dealt with the center hole, but what else would you do differently? How would you go about it?
@@ydonl Au contrair. I have the highest respect for Stefan, a fine machinist and craftsman with a real talent for explaining the arcana of our trade. He does fine work expeditiously, neither hurrying nor fussing over trifles. Maybe I should explain: I'm a retired machinist. I entered my apprenticeship in 1961. I have 40 years diversified and progressive experience usually specializing in large machine tools in a busy Naval shipyard. Over the years, I worked most places in the shipyard where a machinist was needed, the outside machine shop, the gyro shop, the instrument and director shop, the optical shop, the shipfitter and pipe shops, nuclear, transportation. The place was a feast for anyone fascinated with the metalworking trades and I took full advantage of opportunities to enlarge my experience. Add to that stints in layout and inspection, shop floor instruction, and a final eight years in production engineering. Thus, Steven and I are peers. He deserves adulation for his ability, trade knowledge, and craftsmanship, no less so for his clear and well-presented exposition and running commentary on the work he is performing. As a peer from two generations ago, I think it's appropiate for me to gently zing him over trifles as peers do from time to time. Whether my nit-picking about dressing the center hole was unnecessary depends on circumstances. If the drill press spindle was in a system under programmed maintenence, centerhole concentricity could save steps in a future repair; consequently, a few extra minutes re-tooling it might save the next guy time. However, most of the time that step might be, as you say, inconsequential. I'd do it because that was the way I was taught. I've spent too many exasperated hours doctoring battered shaft centers. Stefan may not because chances are the centerhole will be obliterated by a bearing puller, or worse, hammer blows.
Zehr gut!!! I live in California and I was wondering where can I buy that wonderful German or Suisse rust preventative used on precision tools which smells nice and leaves a fine lubricated layer?
very interesting. I also didnt know rubber shielded bearings were more prone to generating heat. That answers a question i have had around a new roller I have been working on that seemed to generate a bit more heat with the rubber shielded bearings I decided to try. I will try some with metal shields.
Ich hab die gleiche Reparatur angefragt per mail. Noch keine Antwort bekommen. Aber jetzt, wo ich gesehen habe, wieviel Arbeit und Zeit das braucht, bin ich nicht sicher, ob das wirtschaftlich Sinn macht. Die Art und Weise dieser Reparatur ist aber auch wirklich alleroberste Schublade! Vielen Dank für die Dokumentation!
Thanks Stefan, really enjoyed that. I like seeing the improvised cylindrical grinding that you and Robin have done (Adam, too, come to think of it). If you come up with a job that calls for a centerless grind, I’d be interested to see your way of doing it!
Ahh, you can’t beat a bit of spindle building good practice to put the world to rights. I have been lapping a myford type m lathe spindle which was lightly scored with a split aluminum lap with excellent results but maybe if I had a precision flat stone I would not have had to make a lap.
Beautiful results Stefan, when do you have to consider removing some of the end as you have slightly lengthened the taper section? Enjoyed very much, cheers!
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Given that the request was to return to a "good" condition, one can extrapolate that Stefan's definition of "good" would be most peoples definition of perfect. Watching these uploads is like being invited to a world class lecture, the most enjoyable and educational content on TH-cam.
👍
every time i lull myself into mediocrity i just watch stefen heh, snaps me right out of my "good enough" rut. lol
There are people with horrible skills, then people with some skills, then people that are good , then people that are really good and then there is Stefan's level . Amazing work Stefan 👏👏👏
eeeh he is just really good ,insane pecision would be range of tom lipton from ox tools.
@@zumbazumba1 Tom is excellent but Robin Renzetti works in jaw dropping detail when it comes to overall skillset as a toolmaker. Robin is also a master in his craft with eyeball deep nerdology. Stefan is excellent in his own right and has many more years ahead of him to grow. That being noted, Stefan is VERY good at his craft and shares much insight, sans any "bob's your uncle".
Oh wait, you forgot Peter from Edge Precision, he is the Yoda of CNC machining world
@@zumbazumba1 Is Tom Lipton really considered "more precise" than Stefan? Do other people agree with that? Genuine question. I am too ignorant in machining to have an opinion.
@@planaritytheory Imo Stefan is at least equal to Tom, but they both excel in there own slightly different areas.
Nothing to add except to say thanks for the chance to see you work in your shop.Never a boring moment here.
"This is a good time not to drop the spindle" always great quality content with your humor, thank you, Stefan 👍😊
"à little bit of work" understatement of the year. This Flott must be a family heirloom.... Thanks for the nice video!
It is now
Everything Stefan does is “precision” which is why I love
his channel, and does it with style.👏🏻👏🏻👌🏻✌🏻
when I do something it ends up 0,05mm off
👍
Very nicely done Stefan! Enjoyed.
ATB, Robin
Obviously you can tell Stefan has seen it, but for anyone who hasn't I do want to suggest people look up Robin Renzetti's video rebuilding his mill spindle, all of Robin's videos are excellent
That video will humble the greatest of precision veterans...(mill spindle is very different than a drill spindle though)
Indeed his videos are excellent but far too few of them.
"Let's take some dead Smurf and check this for fit" - Who says the Germans have no humor! Excellent rebuild!
Smurfs are from Belgium, not that funny for them! 😁
Stefan rebuilding a drill press spindle so it can be used for brain surgery :-) Brilliant Stefan
If you see what drills they actually use to perform brain and spine surgery you will be dissapointed. I didn't know how crude these surgeries were until my spinal surgery failed and I ended up learning the nitty gritty myself (in the time of the internet one can just attend medical specialty schools like neurology, neurosurgery, radiologist and orthopedic without actually being a student there as long as you don't perform surgery on anyone who is alive) after a dozen doctors failed to see the obvious signs that other doctors were too ashamed to admit they missed too.
@@Sketch1994 they just use a normal drill people use in their garage
@@DolezalPetr Pretty much yes...just in stainless. And while I thought it's more like precision machining it's more like contractor's work...
@@Sketch1994 Doctor's are just mechanics that work on people.
@@orangedream267 It's like trying to fix leaks without first draining the liquid.
I missed hearing the happiness perfection giggle. Great job.
A suggestion for an option other than the double nitriles I learned from grilling use - cotton gloves inside the nitriles. It provides a really nice insulation layer while maintaining the dexterity you need and still costs next to nothing.
Really nice job on the Quill. That will be a really nice drill press now.
yes ! what he said ! we are so fortunate to have you on TH-cam. You
are always in some topic discussion around our round table in our shop
thank you for that. regards Skip
Today I learned that "Dinkly dinked" is a technical term. What a glorious spring Sunday..
I was going to ask how that was spelled
It’s the European standards version of the ubiquitous Tom Lipton “Dingus McGhee” 😁
Thanks to this video, I learned two things, besides how to put a drill press spindle together 😉
1. I learned why and how you preload bearings on a shaft.
2. Faber-Castell makes more than art supplies. I never knew they made stuff for machinists. I happen to like their PITT brush pens.
You should make carbide bladed scissors for your abrasive cutting needs. Would be a great project video.
carbide is good
but cbn is better ;)
actually you can buy carbide tipped scissors from medical supliers.
I saw ceramic-edged ones at an electrical supplier; they're for cutting the kevlar jacket on fiber-optic cable.
@@jimsvideos7201 you don't really need ceramics to cut kevlar, just make a quite rough 90 degree grind on decent steel scissors and they will cut kevlar just fine, rough texture helps holding the fibers from slipping out of the V, 90 degree grind is the magic ingredient
they won't last as long of course, but in a pinch it works very well on this tough bendy stuff
Why not just go to single crystal diamond scissors? Cost maybe?
Some TH-cam Creators attempt to conceal their intellect for the purpose of humor, some just modesty. Your abilities and intelligence show brightly without effort on your part, and you frequently perform work outside and beyond Paradigms.
Very awesome to observe your approach to improvements and enhancements to machines and components.
Not a dull or boring subject to be fair, but cool none the less. Thanks for posting!
That is one happy spindle, getting the Stefan Gotteswinters special spa treatment😁
Nice rebuild Stefan👍
Excellent education in the finer parts of machining and tool making! Thank you for your constant precision and for your detailed explanation and commentary! You are the finest machinist/educator I have found on you tube and I aspire to achieve 1 tenth of your skill on my own projects!!!
That drill press is now a mill. I learn something every time I watch your videos, thank you.
Nailed it!😄 What a nice job. That spindle nose came out perfectly. I couldn’t believe how well it blued up👍
Sometimes, just the simple non critical jobs can be the most satisfying. Simply awesome work, Stefan.
Excellent workmanship as always.
Thank you for taking the time to record, edit and upload, it must add a lot of time on a job.
Hi Stefan, Since I recently purchased a TB 10, I came across this video two days ago. By now I must have watched at least half the videos you have posted. Which means on Monday I‘ll be through.... very impressive whats possible in a basement shop. You really accumulated some serious equipement.
I‘ll definetely get in touch with you about my spindle.
Beautiful job Stefan! It's worthy work to restore a well built machine to full service, preserving all the work the original makers put into the rest of the machine and allowing it to continue to serve :)
I have added "dinklie dink" to my shop vocabulary. Thanks Stefan, great work and video.
I thoroughly enjoy your videos. Seems each time I learn something new. This time it was the hint about steel wool. I was never taught there was a good way in a wrong way. Thank you.
Your pointer long time ago about CRATEX has improved many a part!
I will love a series where you restore or rebuild old machinery. I am big fan of your work Stefan. Cheers from Argentina
I really liked your setup with the electric screwdriver. Nice out of the box way of thinking.
Great video production...discussion/demonstration/build...enjoyed
I am starting a formal petition to call Stefan Gotteswinter : "God of Machinery Stefan Gotteswinter". Anyone else agrees ?
I enjoy your channel , you are one of the few who have an understanding of what you're doing. To qualify that, I am retiring soon as a mechanical engineer and a class A tool maker in my own precision mold / job shop. I just don't know why all the TH-cam machinists turn their grinder spindles off after they dress them. Once you dress a wheel it is in dynamic balance and should not be shut off till grinding is complete. I have over 40 years experience in high precision grinding. Everything we do is in the micro range. Take it for what it's worth.
That excitement/stress/rushedness of fitting that first bearing haha been there
Thank you Stefan for another educational video. Thank you for the time you have taken to create this video for us 🙂
Funny I got bit by the hot bearing a few videos back when I was working on the valve grinder spindle and now you got the same thing. Makes me feel better about my oops. 😂 Might you should have ground a little off the end so no danger of the spindle end bottoming out before it reaches the taper? Seems that could possibly be an issue.
I'm glad you made a mistake with washer not being part of the Spindle because you did a perfect job, shows you are human.
Very nice job on the rebuild. Thank you for taking the time to bring us along, and show us how a craftsman repairs a spindle.
That drill press has probably never been so smooth. As always, Thank You for the lessons learned.
Take Care and Stay Safe.
Bob
27:00 I'm gonna call that the set up of the year! Very good!
I always love watching you go to the a level of precision just beyond what is necessary. Thank you for explaining all of your decisions. Great video, THANKS!!!
I took an old junk Taiwanese drill press that someone was giving away. It had a Jacob's taper 2 1/2 on the spindle. I successfully converted the spindle over to JT6 and put a keyless chuck on it. Great usefull tool in the shop now. That was my first time to use the taper attachment that came on my Logan lathe.
Beautiful 110% quality as usual.
True craftsmanship. Awesome work. Thanks for sharing this.
I love every video where you repair or improve the accuracy of metal working tools.
Definitely enjoyed and learned something. Thank you Stefan for a slight glimpse of the joy in your shop. 👍👍😎👍👍
es macht einfach Spass, dir zuzuschauen
Just what I needed ! Thanks Stefan. Hope everything is getting healthier over there.
I've learned so much from watching you. Thanks again.
19:40 "It even keeps the coffee warm"
Hahaha, be honest, thats the main use 😁
Wonderful to have a Stefan video for the weekend. Thanks for all that you teach us!
Thank you Stefan. I thoroughly enjoy your videos and learn a lot from everyone of them.
Magnificent workmanship!
Thanks I enjoyed this video. I also figured out what to do with my old NiCad Cordless Drill. I have a old bench top Canedy-Otto drill press with external taper. Someday I will get around to restoring it. I measured run out with a indicator in a chuck relative to the bed and it was pretty much spot on. The only problem is the chuck sometimes falls off because the taper is a little beat up. I am checking eBay because I am thinking about replacing with a internal taper because I have a lot or taper shank drills. Thanks again.
Great Job Stefan!!! very satisfying as always. I have a drillpress that I'd like to rebuild the spindle on so Ill definitely be watching this one more than once!
Mission superbly accomplished.
Stefan, I am always amazed by the high quality of the work you do! You may have exceeded NASA specifications on this spindle. I cannot thank you enough for what I am learning from your videos. I completely understand your comment about how much fun this work is. Sadly, I think we will be losing a great deal of the knowledge craftsmen like you possess since too many children today are afraid to get their hands dirty. :-(
Great job as always on the rebuild, love how thorough you are and the explanations of why you do something as you are doing it. Thank you for sharing!
I did enjoy that Stefan............simple workshop practices on the bearing change and still I learn something. I like you videos very much!!
Fantastic work Stefan turning a worn out drill press into a precision machine again!
Man I wish we could see the old drill press in action after this.
Totally enjoyable learning experience as ever, Stefan. I’ve watched it three times already! Thanks for producing this stuff so well.
I really liked how You did the tapered grinding just indicating it in. Great result. The axial load of a groved bearing is quite good, best for deep groved ones. Had several arguments with people on this, its in the data sheets. I think the issues people have are more from improper alignment and pre load. And sometimes over lubricating which causes heat problems.
Great tutorial. Will give this treatment this weekend to my Aldi drill press.
Thank you for another great video.
Your work habits are always spot on
and that is the way any young
machinist should learn the craft from
the start of his quest to be good at
what he/she does all thru life.
Everything done to spec. As always. Excellent explanations and perfect videography. Thank you very much.
Tip: When deburing/polishing a journal, shaft, etc, then us a 321 block, or a parallel with a piece of wet and dry abrasive paper(with/without light oil) instead of a stone. Works faster, cleaner and saves on irregular slip stone wear. 321 blocks are best as the holes act like reliefs and holds the grinding sludge away from the interface.
Alles in ordnung, Stefan! Sehr gut!
I was just about to go to bed! Looks like I get to wait a little longer.
Sweet, new video! The rest of my Sunday can wait 40 minutes. Nobody tell Robin he wasn't using the whole surface of the precision ground stones.
Nice Job!
I did the same thing for my old Flott, but on the lLathe with a support grinder. It was OK, but not as sophisticated as your job.
An old and very experienced mechanic that was reparing old drill presses once told me that the deformation of these tapers normally come from a slipping chuck on the taper. When the chuck slipps, the higher points get warm and harder than the rest of the taper.. When the chuck slips again, the harder points will remain and the softer parts will wear a bit more. You can't remove the hard tips with a simple honing stone then and you need to grind it with a grinding wheel, like you did.
SEEMS TO BE BETTER THAN A NEW ONE !
Very nice job, love the cylindrical griding motor set up. Thanks .
Excellent video! First time viewer. Great instructional technic. Attention to detail and practices great for novice and pro. Thanks for sharing! 👍
I love the extra mile you go in your work. Very nice!
As usual, another informatve/entertaining video from the master. Thanks Stefan.
yes i caught a 1 in drill bit in a work piece and bent our drill press (visibly), yey that back bearing was pretty rough sounding, the axle bearing on a john deere 4430 uses a hot install course its a 4 in axle shaft, cool job my first time watching
Stefan, very nice work as usual! Thanks for sharing. Joe
Excellent job, you do some amazing things,
Did I hear a contentment sigh? too good ! love your work Stefan! that made my day.
I could hear that smile when the taper checked out that close.
That was fun and educational. Thanks Stefan.
"Better than factory" is like music to the ears
I like your spindle turning motor!
Super interesting video - lots of great tips. Your attention to detail is amazing, and comparable to Robin Renzetti's videos.
Always enjoy your video. There different, not your typical machining videos.
Yeah, 6.35mm hex shank. Lovely work as always Stefan.
Sooooo satisfying! Thank you Stefan!
Thanks for video, I've got a milling machine that runs hot, suspect spindle bearings are worn out, will have to get around to replacing them.
Excellent. Step by step demonstration with clear discussion of each detail. There's a world of teachers who could benefit from your example.
But! The center hole in the taper end is now out of concentricity with the spindle axis. That might mislead the guy who replaces the bearing in 2089. My solution would be to chuck the spline in your lathe, support the quill barrel in the steady rest, and fine tool the center hole back to concentricity. It'll only take a few minutes. A trivial refinement but since we tend to take undamaged reference features as Gospel it couldn't hurt.
@@ydonl Good point; but moot, being so far in the future. However the issue is completeness of task in the here and now.
@@ydonl Are you trolling me? Sorry. That doesn't work
@@forrestaddy9644 No, sir -- sorry. Stefan did a stellar job, with runout down in the micron region (which would be 0.000039 inches... 39 miillionths...) and my conclusion would be that he's both very bright and very skilled, as well as possessing excellent judgement. I suspect that if he thought the center hole had any significance, he would have addressed it. I wouldn't have been surprised, but neither am I surprised that he ignored it. It hit me oddly that you would think the best response would be to pick up this arguably inconsequential detail. I think the best way for you to show your perspective on the matter would be to... show your perspective on the matter! :) Clearly you would have dealt with the center hole, but what else would you do differently? How would you go about it?
@@ydonl Au contrair. I have the highest respect for Stefan, a fine machinist and craftsman with a real talent for explaining the arcana of our trade. He does fine work expeditiously, neither hurrying nor fussing over trifles.
Maybe I should explain: I'm a retired machinist. I entered my apprenticeship in 1961. I have 40 years diversified and progressive experience usually specializing in large machine tools in a busy Naval shipyard. Over the years, I worked most places in the shipyard where a machinist was needed, the outside machine shop, the gyro shop, the instrument and director shop, the optical shop, the shipfitter and pipe shops, nuclear, transportation. The place was a feast for anyone fascinated with the metalworking trades and I took full advantage of opportunities to enlarge my experience. Add to that stints in layout and inspection, shop floor instruction, and a final eight years in production engineering. Thus, Steven and I are peers. He deserves adulation for his ability, trade knowledge, and craftsmanship, no less so for his clear and well-presented exposition and running commentary on the work he is performing. As a peer from two generations ago, I think it's appropiate for me to gently zing him over trifles as peers do from time to time.
Whether my nit-picking about dressing the center hole was unnecessary depends on circumstances. If the drill press spindle was in a system under programmed maintenence, centerhole concentricity could save steps in a future repair; consequently, a few extra minutes re-tooling it might save the next guy time. However, most of the time that step might be, as you say, inconsequential. I'd do it because that was the way I was taught. I've spent too many exasperated hours doctoring battered shaft centers. Stefan may not because chances are the centerhole will be obliterated by a bearing puller, or worse, hammer blows.
Zehr gut!!! I live in California and I was wondering where can I buy that wonderful German or Suisse rust preventative used on precision tools which smells nice and leaves a fine lubricated layer?
Servus Stefan, a very interesting video, thanks for showing it.
That was totally fascinating and entertaining .
very interesting. I also didnt know rubber shielded bearings were more prone to generating heat. That answers a question i have had around a new roller I have been working on that seemed to generate a bit more heat with the rubber shielded bearings I decided to try. I will try some with metal shields.
Nice work Stephan, cheers, Doug
very good job stefan..thanks for your time
Awesome skill...Great communication...excellent teacher...Thank You.
Ich hab die gleiche Reparatur angefragt per mail. Noch keine Antwort bekommen. Aber jetzt, wo ich gesehen habe, wieviel Arbeit und Zeit das braucht, bin ich nicht sicher, ob das wirtschaftlich Sinn macht.
Die Art und Weise dieser Reparatur ist aber auch wirklich alleroberste Schublade! Vielen Dank für die Dokumentation!
Thanks Stefan, really enjoyed that. I like seeing the improvised cylindrical grinding that you and Robin have done (Adam, too, come to think of it). If you come up with a job that calls for a centerless grind, I’d be interested to see your way of doing it!
Ahh, you can’t beat a bit of spindle building good practice to put the world to rights.
I have been lapping a myford type m lathe spindle which was lightly scored with a split aluminum lap with excellent results but maybe if I had a precision flat stone I would not have had to make a lap.
Beautiful results Stefan, when do you have to consider removing some of the end as you have slightly lengthened the taper section? Enjoyed very much, cheers!