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Wot's this for ? help please

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Stewart Hart17/06/2020 08:58:17
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I bought a spindle and drive belt for a project I'm developing as part of the kit there was a small "C" clip that I can't for the life of me work out where it goes see attached picture, its got something to do with the bearing assembly but that's as much as I can work out there is no obvious place for it to go. Can any one shed a bit of light on this mystery

Stewdsc03824.jpg

Brian Wood17/06/2020 09:17:37
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Stewart,

I looks as though it should retain a bearing, perhaps the right hand one on the mounting block that doesn't look as though it is fully home.

Other views may help

Regards Brian

Bo'sun17/06/2020 09:25:15
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I agree, the "C" clip groove might be obscured by the bearing.

JasonB17/06/2020 09:28:27
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I would say it just slips loosly onto the shaft between read bearing and toothed pulley as a crude spacer so the pully boss does not rub against the bearing's outer race. Better to bin it and turn a small spigot onto the pulley boss or make up a thrust washer as position of pulley sets the end float.

There are usually no grooves in the spindle on these items.

Edited By JasonB on 17/06/2020 09:29:58

Stewart Hart17/06/2020 09:29:14
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Hi Brian that was my thoughts but it’s a lose fit on the shaft there’s no groove on the shaft or in the bearings for it to fit the bearings which are flanged are fully home

Stew

Stewart Hart17/06/2020 09:51:31
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Hi Jason

I was thinking it was something to do with end thrust the shaft is a tight fit in the bearings but I cannot see how end thrust when drilling will be restrained I’m intending to use Loctite to fix the bearings better and ditch the clip

Thanks for your input chaps

Stew

Nicholas Farr17/06/2020 10:55:40
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Hi Stew, maybe the shaft has moved in the bearings one way or the other and there might be a groove hiding under one of them.

Regards Nick.

Phil P17/06/2020 11:11:03
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The clip could not have just dropped off the shaft if that is where it fits.

Was the whole thing assembled like that when it arrived ?

Phil

JasonB17/06/2020 11:16:17
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To save any more suggestions If you look at the many of these on e-bay etc none have grooves but all have the ring

Stew I would say that the larger dia at the base of the chuck taper should go against one bearing to take the drilling pressure and the pulley slid up to take out and play.

spindle2.jpg

Edited By JasonB on 17/06/2020 11:19:27

not done it yet17/06/2020 11:17:13
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Have they supplied a ‘c clip’ instead of a ‘chuck key’?

JasonB17/06/2020 11:21:45
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Found itsmiley From the same set of images to the ones I posted above

spindle3.jpg

Edited By JasonB on 17/06/2020 11:22:37

Stewart Hart17/06/2020 11:40:23
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Hi Chaps

I think Jason is correct its just a crude spacer to go between spacer and pulley to take some of the thrust, as for the other end I'm going to fit a sleeve between the slightly larger collar diameter and the bearing locating on the inner race this should take up the thrust, I'm unsure wether to fit another spacer between the two bearing again on the inner race so that they share the thrust. I want to see just what duty these spindle will do, there's a few videos of them in use doing light work.

Just what I'm planning to do with it you'll have to wait until next week some time when I've got the fixture completed I'll post a video of it in action hopefully:- its another bit of pottyengineering devilry devil.

Stew

duncan webster17/06/2020 13:01:43
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If they are flanged bearings then if you attempt to apply end load to the one at the pulley end won't it just be pushed out of its housing?

 

Edited By duncan webster on 17/06/2020 13:03:29

not done it yet17/06/2020 13:30:56
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The clip appears to be a simple spacer, rotating with the shaft/pulley/inner race to crudely prevent the pulley bearing on the outer race. As those components are all totating at the rame speed there should not be a problem. A small diameter washer would suffice just as well.

Are both bearings properly designed to accept axial thrust, I wonder?

Ian P17/06/2020 14:20:51
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Posted by not done it yet on 17/06/2020 13:30:56:

The clip appears to be a simple spacer, rotating with the shaft/pulley/inner race to crudely prevent the pulley bearing on the outer race. As those components are all totating at the rame speed there should not be a problem. A small diameter washer would suffice just as well.

Are both bearings properly designed to accept axial thrust, I wonder?

I think products like this one a mainly 'designed' with saleability as the first priority, performance and longevity are further down the list.

I doubt the bearings are anything special.

I bought a 'Dremel' type power tool that looked quite good in the pictures. It has a cylindrical aluminium body and is fitted with a 1/4" Jacobs type chuck, it also has a supplied 24VDC power supply with speed control all came in a nice moulded carrying case. Now its arrived I find it near useless, It has a brushed motor bonded (I think) into the ali tube outer case and the chuck is bushed in some way so that it fits the 3mm motor spindle (not removable). It has the about 3mm axial freedom in the motors plain bearings and obviously no provision made for thrust.

Yes, it a hand power tool and it was not expensive but not one I would recommend

Ian P

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