SNNC 300 P1 626 Mill Bearing Replacement

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[@sjb59]

This is such a good channel, watching someone who knows what they’re doing, I’m learning loads 👍

[@MaturePatriot]

I agree. It is one of my must watch channels. John doe s OKAY for a mechanic "who pisses about in the shop". LOL

[@samrodian919]

emsjb05 Aye! John knows his way around all sorts of machinery, from steam to plasma power! And more power to his elbow! Keep 'em coming John

[@rosswaring2835]

SNNC 300! Congratulations John... Thanks for sharing so much of your handiwork, swearing and good humour!

[@eyuptony]

Quack quack. Great these type of videos John we watch in suspense waiting to see what you unearth. Roll on part two.

[@robowens3030]

300 Night Caps!!! Congratulations!!! Thank you for so much learning and entertainment.

[@MyTubeSVp]

Congratulations on number 300, and my sincere thanks for makin’ ‘em !

[@TheChristeepher]

I know exactly what you mean about the garage John, takes me longer to find the bits for the job than to do the job! Congrats on SNNC300 you have certainly put the hours in to get there. Thank you young man.

[@MaturePatriot]

...and I have watched every one of them!

[@Davidthomasv8]

And me now

[@tomthumb3085]

Congratulations on the 300th episode. Always great to watch.

[@dalejones4186]

If I could thumbs up 1000 times I would. Thanks John. Love the channel. May God bless you and yours.

[@mhbh1979]

Hi John, when two bearings are on a shaft right next to each other like that without a spacer for the outer races I have found that the force of installing them in the casting causes them to wear prematurely. The force of installing them puts a kind of preload on them. The ball bearings in one or both then chatter their way round eventually wearing radial grooves in the outer race. That noise is typical of this. When you install the new bearings give the shaft a tap in both directions to relieve the sort of preload from installing them. You will be able to feel how much more free they are after doing this. Great video as always👍 Edit... In fact thinking about it surely the nut also forces the two inner races together which will also badly preload the bearings. Maybe a thin shim between the two inner races would sort that out.

[@KozmykJ]

When John was driving the bearings out from underneath the quill shaft moved up, through the inners, quite a way (as shown by the seal dirt mark) before the bearings started to move. Looked like 2mm or so from the video. I wonder if that distance might have been home to a spacer originally, before John bought it perhaps ?

[@mhbh1979]

Quite possibly, I missed that

[@therealspixycat]

Hi John. You can pop out the plastic black rings to check the inside of the bearing.

[@ÁREAJ27]

Hola meu amigo gosto de ver muito seus trabalhos e aproveito para aprender um pouco mais!Excelente trabalho,e aguardando a continuação deste reparo!

[@paulmorrey733]

Thanks John I have the same mill - good to know how it comes apart.

[@farmersteve129]

A couple of things - as others have said, check the bearings on the intermediate pulley, the other is check that the pulleys are running true.

[@cathyroberts4887]

Hi John, Just watched you dismantle your mill with the mystery noise. Just a thought, if the new bearings fail to eliminate the noise try spraying WD40 on the belts when the mill is running at high speed with the noise to see if the belt/pulley is generating the issue. keep up the good work. Regards, Med.

[@rosswaring2835]

cathy roberts I use candle wax so the belt doesn’t slip afterwards. Just run the machine slowly and press a candle onto the contacting surfaces of the VBelt...works a treat.

[@rickwebb3172]

Way y to go, John!!! Let us see three hundred more!!

[@KozmykJ]

Idea just came to me. Make timing marks (white paint) on the 3 wheels and 2 belts then watch to see which mark coincides with the noise. Either in real time or measured on video. You've most likely sorted it before I type this but hey ! Thought I'd share ...

[@nikond90ful1]

Thanks for the video John,

[@bostedtap8399]

Happy 300 SNNC. Maybe a small burr on one of the pulleys? Great vlog John.

[@MaturePatriot]

Congrats Steve! How will we know it's you with out the mill noise? LOL John, you left us hanging! I knew you would want to make a new nut for that. I would.

[@colmone5592]

The noise is because the belts are too thick in their depth, not the width. On the small diameter pulleys they have to compress themselves too much. A toothed belt on the motor will cure it. Toothed belts can cope with small diameter pulleys. The belt on the larger pulleys is fine as it is.

[@colmone5592]

I am wrong about the second belt as it too can use a small diameter pulley. Alternator belts on older cars used toothed belts or very thin sectioned belts.

[@colmone5592]

Fitting a pair of extremely cheap Dayco belts off the internet ironically will cure the problem.I use them and they have lasted well.

[@colmone5592]

OR. To prove the point take the old discarded belt from motor to the idler pulley and convert it with the tools of your choice to either a toothed belt or low profile belt by removing about 1 / 8th inch from the inside.. Fit it to motor and noise will be gone hopefully .Point proved at no cost.

[@bookerol]

John, looks like you should plasma cut a wrench for that lock ring.

[@MaturePatriot]

Great idea. Cut it out of 1/4" plate and weld to a pipe with a plug in the other end for a torque wrench.

[@JoeBee999]

I wonder if the bearing in the middle post is causing the sound. Not that after repairing the front, the noise is still there.

[@JoeBee999]

@@MaturePatriot Great Idea. And he can do this without the mill which is in peaces.

[@silverbullet7434]

Would drive me batty listening to that whine . Nice n easy repair tho, glad of that for you.. Thanks John.

[@stevecallachor]

John, I'm surprised you didn't show us the screwdriver in your ear to isolate the bearing noise, it's a very effective and quick diagnosis tool. Don't put the pointy end in your lug hole though, but I guess you know that. Steve, the monaural diagnostician

[@johnmcdyer7297]

Them bearings you pulled off the shaft are pre loaded make sure you put the new ones back on with the thrust faces the correct way round at least that’s the way they were on my mill only they were on the lower part of the spindle John hope this helps

[@mc_cpu]

Could you test the bearings in the lathe? Clamp them in the chuck and drive them somehow? Looking forward to the solution.

[@roeng1368]

Would it be the bearings moving on the shaft or in their housing ? Any sign of fretting or scoring on either ?

[@barrygerbracht5077]

My guess is the idler pulley mechanism is either worn or crooked (manufacturing defect). Pulleys that are not aligned properly will make the belts squeal. It could also be the motor pulley is to high or low and needs alignment. Put some straight bars across them and see if they are parallel and aligned.

[@FrontSideBus]

The Pulley looks like it's got a bit of run out? Maybe causing the belts to vibrate at high speed?

[@BruceBoschek]

Thanks for another very informative and enjoyable video, John. I couldn't help but wondering about the bearings in that intermediate shaft. Have you checked them. Also wondered about the belts themeselves. Can they be making noise at high speeds? Hope you get this sorted.

[@craigbrown790]

Those bearings do sound to be rough when you spin them by hand at 13:24. Hope the new bearings sort the noise out 👍

[@oldninjarider]

Yay! No more groaning mill noise!

[@chriscraven9572]

I sympathise about the reorganising. I'm moving house in just under 2 weeks time and have to dismantle my workshop and set it up again in the new location. Plus the new workshop need the floor and walls painting, electrics and lighting. Arghhhh.

[@mealex303]

Might need a metal washer between the two rubber seals on those bearings? Or look further inside the housing see if its out of round.

[@MatthewTinker-au-pont-blanc]

Just an idea, sounds like belts, they arn't touching the bottom of the "v" are they? have you thought about running link belts? Regards, Matthew

[@scottgibson7534]

Sounds to me it,s the belts John, if you look back at the replay you can see the belts resonating.

[@johnmcdyer7297]

Me too

[@micbanand]

please test the center pully. bet its where the sound comes from

[@fx1c333]

It would be interesting to see the bearings put back on the shaft and then put into thee lathe. Then run it up to speed grabbing hold of the bearings to make sure. Holding the bearings would tell if they were bad at speed. At on the video 5:28- I'm sure I saw the pulley move up and down Might be wrong.

[@larrymunday7519]

Definitely sounds like the belts.

[@larrymunday7519]

Spray some WD on them while running and I bet the noise disappears.

[@larrymunday7519]

Looks like it is the rear belt.

[@martinda7446]

Surprised to see standard ball races, would have expected a tapered roller bearing? Not that I know ought mind.

[@martinda7446]

Does that end handle any axial thrust?

[@doubleboost]

@@martinda7446 Just the belt tension The quill has high quality taper rollers

[@martinda7446]

@@doubleboost Aha! Thanks. Great, great channel BTW.

[@andrewbranthwaite5240]

The subtitles on the preview when you hover over the thumb nail are hilarious.

[@randomdude1786]

Some scary noises on Halloween. You look.... nothing there, or is there! Ive got 280 zx guts spread everywhere includes the complete engine wire harness no brain box, gotta find that brain box

[@bryz5232]

Emailed you John.

[@johnoregan8245]

Hi John, Have you checked the bearings in the idler pulley ? John

[@lloyd4768]

I was just going to say that.

[@colinsalter3516]

Looks like a easy mill to work on . You won't know yourself when those bearings are replaced. Nothing worse than a high pitched whine ringing in your ears.

[@Xlaxsauce]

the noise that comes from your mill is not a noise i've heard from any other machine