Got a bearing in a blind hole to remove?
https://www.youtube.com/watch?v=ggsEewAg2YM
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Got a bearing in a blind hole to remove?
https://www.youtube.com/watch?v=ggsEewAg2YM
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<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/blind-bearing-removal-method"> <img src="/uploads/146067/blind-bearing-removal-method.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/blind-bearing-removal-method">Blind Bearing Removal Method</a> <span> by <a href="http://www.homemadetools.net/builder/bstanga">bstanga</a></span> </div> <div class="tags">tags: <a href='http://www.homemadetools.net/tag/bearing'>bearing</a>, <a href='http://www.homemadetools.net/tag/disassembly'>disassembly</a> </div> </div> </div> </div>
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A favorite combination; useful hack, logical steps, humble surprise, with proof of results. And humor in the issue of bearing packed with paper towel. Hydraulics! Later it'll be when the designated household engineer is missing half roll of paper towels.
Point out repair of that #3 or #4 taper live center would buy maybe 10 cases.
Way back in reloading odd cartridges, we'd pop out Berdan primers with water and a close-fitting punch. Again, Hydraulics!
Imagine this; what if Archimedes, Michelangelo, and Industrial Age inventors had youtube...
Thanks for the kind words toolmaker51, that's why I love this site great feedback and tons of good content..Quote:
Originally Posted by Toolmaker51
All the best
Brian
Back when I was running a Battalion Motor Pool While we were on a field readiness exercise a clutch went out on 1 of the vehicles I assigned 2 of what I thought to be qualified mechanics to replace it, A young sp4 came to me with what he thought was a severe problem the Pilot bearing had seized. When you are in the field you cannot carry the full complement of special tools you would normally be able to check from the tool room, so not having Special tool # bla bla bla bla, he couldn't figure out how to remove the bearing from the counter bore of the crankshaft.
Bring me the new bearing I told him. I took a look at it then said I need 1 of the sections of the tent pole from your shelter half and a grease gun plus the hammer from your tool box.
A few pump of grease insert the blunt end of the tent pole and a good hard rap with the hammer. out came the bearing. Simple matter of Hydraulics like TM51 stated. Something I thought he should have learned in his MOS training, but after thinking about it, it wasn't taught there. I had learned the trick from my Dad
Oh, I'm sure it was taught; just the young Spec4 hadn't truly realized theory and recognized potential mechanics. It's real hard to get out of the box imposed by A & C schools. Uniform means a lot more than field gear or what I hauled around in a seabag.
After watching the youtube, I analyzed paper reduced volume, with likely increase of direct pressure, with advantage of 'sealing' the bearing and unknown broken races. Pop!
TM51 there is that about the possibility of broken races. reducing a paper towel or tissue paper to a near pulp state or a thick slurry packing that in as tightly as possible then inserting any object to serve as a piston then striking the piston. Like you say POP.
The same could be said for using sugary molasses or peanut butter
there is one thing that I will never forget when I was taking one of my secondary MOS courses. On or about our first day the instructor held up a torque wrench then asked if there was anyone who thought they were a mechanic in the group. Several held up their hands. He then asked what the tool was he was holding. Only 3 or 4 us us still had our hands up. I must have made a gesture of being bored or something that made him call me out.
Well I've never seen one like you have with a dial on it but you have a torque wrench which is used to determine if you have a bolt or nut tightened to the proper specs if you don't have one you can get nearly the same results with a 24 inch breakover bar and a 75 lb fish scale by hooking the scale on the end of the break over bar and pulling on the scale until you read the number on the indicator but you have to multiply the number by 2 because the bar is 2 ft long. He called me a smart azz and made sure to try and trip me up throughout the course. Being my Father's son really paid off but also Being the son of a retired Gunnery Sgt and my big mouth got me into just as much trouble as well.
Thanks for that bit of 'hope I don't have to use knowledge' I think after a few tries I would have took a torch and did a quick heating of the unit, not too much as I would not wont to have hot grease or even water squirting in my face, just enough to give a little expansion to it.
Pretty clever. Thinking about this I'm recalling somewhere reading about how the paper towel makers have been changing the mix of materials to include fine filaments that add substantially to the wet strength of the towel. I think this is the key to it all. When sufficiently packed into the confined space the wet towel material essentially solidifies sealing the insides of the ball bearing and turning it into a piston of sorts. You can't do this with plain grease or any other true liquid material that will simply be forced past the bearing shields (or seals as the case might be) by the "hydraulic pressure" created by the hammer blows and the high pressure shock wave that they produce.
The bottom line here is that a combination of knowledge of basic physics and strength of materials is critically important to the skill development of all mechanical technicians and not just the engineering types (like me). Not that tribal knowledge isn't important. But an understanding of underlying science can save a lot of trial and error.
And decent aim with a deadblow hammer!Quote:
Originally Posted by Ed Weldon
Thank you for sharing this information. I have had this situation in the past.
I hope you wont delete me. I read every email you send and use that information to my advantage. I am not as smart as a lot of guy's I read about. Ma be some day I will come up with something interesting. Thanks to all.
Thanks for this idea, more cleaner than mine with grease in place of paper and water under the hydraulic press!!!
Have a nice day.
Pierre
Nice hack, not messy like using grease.
I had to get a pilot bearing out of a crank once and din't have any grease handy so I used margarine.
Worked like a charm.
Lol, I just showed this trick to my stepson last week to get the pilot bearing out on his Toyota. He didn`t believe until it started moving. My foster father taught me the trick in the 60`s but using grease. Paper towels and water are significantly less messy.
How did you remove the outer race of the rear bearing?
It`s a one-piece sealed bearing so it all comes out as a unit.Quote:
Originally Posted by Gromet
Thank you for this is incredibly useful trick. Now that I have seen it done, it will be etched in my memory forever (or go senile, whichever comes first). Next time my son needs a a practical example for his school physics, I am going to show him this.
In reality a high percentage of us probably aren't smart; we all know smart folks who don't know not pull an adjustable wrench on the moving jaw.Quote:
Originally Posted by Ron Moomaw
We're more likely observant, creative, and dedicated. We certainly are welcoming, generous, congenial too.
But most of all, everyone is combined mentor and student.
Well, it looks like your paper towel method worked.
But your internet video skills really leave something to be desired. The audio levels are all over the map: in some places it is too loud for even my 75 year old ears and then it goes down to the point where you can not be understood even when I jack up the volume all the way. I completely missed the part where you perhaps explained why you did not use the grease that you talked about at the beginning.
I guess I should be thankful that you did not include the super loud music that most internet video producers seem to think is mandatory. Thanks for that, at least.
It's fascinating what atypical materials can serve as thick hydraulic fluid... I just removed a pilot bearing while replacing my clutch and used white bread to the same end (old trick, not original to me). In the attached photo you can see the seal is concave due to the pressure exerted via the dough... and the dough plug came out in one piece.
Attachment 42053
I'd not care to bet on that if I were you, Ed, as I've done it with grease and pin that fit the bearing tightly. I know just grease will do the job if the pin fits well. Remember this is in a blind hole. Unless the shields are just flat gone-rusted out or worn away, they'll still apply the force of the compressed grease. Will it work better with paper towel? Haven't tried that method myself, so couldn't say, but I know it can work with only grease. I've done it. Though honestly I hope I never need to do this again, either! ;)Quote:
Originally Posted by Ed Weldon
Bill
Stiff, almost dry mud works very good also.
This is one of the coolest tricks I hope to never need to use.
The instant that bearing popped out I said to myself, "I'll be damned!", at the very same instant the narrator uttered the same.
Thanks for sharing!
HEAT. Heat up the outside and it expands a bit, loosening up the tight fit.
