By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Shimming Techniques

All Topics | Latest Posts

Search for:  in Thread Title in  
Tony Pratt 102/03/2021 08:17:56
1468 forum posts
7 photos

Suggest it's the spindle bearings.

Tony

Dr_GMJN02/03/2021 08:40:33
avatar
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
avatar
996 forum posts
Posted by Tony Pratt 1 on 02/03/2021 08:17:56:

Suggest it's the spindle bearings.

Tony

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

img_1627.jpg

Dr_GMJN04/03/2021 13:16:13
avatar
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

Howard

Neil Wyatt04/03/2021 15:18:20
avatar
Moderator
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.

Neil

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
ChesterUK
JD Metals
Eccentric July 5 2018
Warco
cowells
emcomachinetools
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest