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Shimming Techniques

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Tony Pratt 102/03/2021 08:17:56
1468 forum posts
7 photos

Suggest it's the spindle bearings.


Dr_GMJN02/03/2021 08:40:33
996 forum posts
Posted by JasonB on 02/03/2021 07:05:39:

Did you ever get round to checking the spindle bearing backlash?

You mean axial play effectively, or radial as well?

I've put a bar in a chuck in pulled it backwards and forwards and cant feel anything. Not put a clock on it though, apart from checking runout which was OK.

Dr_GMJN02/03/2021 08:41:22
996 forum posts
Posted by Tony Pratt 1 on 02/03/2021 08:17:56:

Suggest it's the spindle bearings.


Seems likely, but I'll have to do a much more in depth check. There's certainly nothing 'loose'.

DiogenesII03/03/2021 08:04:53
214 forum posts
108 photos

There was no play in these bearings that could be felt by hand - before & after adjustment, using same cutter & set-up..

It'd be perfectly normal to have to adjust the spindle bearings after a period of running as the cycles of heating / cooling, vibration and pressure settles the components into place against each other, and the initial cold setting made at the factory is lost..

Maybe someone (with knowledge of the SX?) could explain the 'how to'? ..I'm gonna be really late for worksurprise


Dr_GMJN04/03/2021 13:16:13
996 forum posts

I can detect no axial or radial play in the spindle at all, so the side milling problem remains a mystery.

Howard Lewis04/03/2021 14:58:50
4678 forum posts
10 photos

Looks like an impression of the helix on the flute of the end mill.

One assumes that everything is rigid, cutter tightly clamped, cutter holder firmly clamped into quill, minimal backlash in fedscrew, (nip up the clamp ) work holding rigid?

A lower feed rate, and shallower cut, might help?

Having said that, sometimes a heavier cut stabilises the cutter


Neil Wyatt04/03/2021 15:18:20
18558 forum posts
723 photos
78 articles

A pattern like that means a resonance is being set up between the cutter and work.

The movement may be undetectable, but the resonance means more movement than usual.

A small speed change should prevent it, if it is aesthetically undesirable.


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