By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Forum House Ad Zone

Myford chuck security

All Topics | Latest Posts

Search for:  in Thread Title in  
Trevor Davies 212/11/2012 18:40:38
5 forum posts

Myford ML7R

When trying to use rear parting tool and running the motor in reverse I found that the chuck was unscrewing itself off the headstock spindle. When fitting the chuck I lock the spindle by engaging backgear and then with the chuck key tighten the chuck on its thread as much as possible by hand..

How do I stop this happening so I can use the rear toolpost parting tool?

blowlamp12/11/2012 18:47:11
1663 forum posts
106 photos

Mount the parting tool upside down and rotate in the usual direction.

KWIL12/11/2012 19:05:09
3564 forum posts
70 photos

Please do not engage backgear, you may well end up with a broken gear.

Does the ML7R have a pin (like the Super7) on the left hand face of the headstock which engages with the step pulley for the purpose of locking the spindle?

I exhibited a simple device at Sandown MEX which prevents the chuck unscrewing and which may well appear in published form shortly.

Brian Wood12/11/2012 19:43:30
2579 forum posts
39 photos

The ML7R does have a pin as KWIL describes, use that instead of back gear, it is much more positive ion use.

joegib13/11/2012 06:48:21
154 forum posts
18 photos

You could always fit a chuck lock of the type discussed in this thread when running in reverse:

Chuck Lock by Woofity

Similar chuck locks were supplied for their screw-nose lathes by respected companies such as Schaublin so they're not gimcrack devices. This assumes, of course, that your chuck backplate has a spigot 'neck'.

Incidentally, Woofity's version is a little more elaborate than commercial versions. The latter were commonly a simple split collar with a single screw spanning the gap (the strain relief hole opposite the split is still required, though).


Edited By joegib on 13/11/2012 06:55:12

Nobby13/11/2012 11:29:43
587 forum posts
113 photos

Hi Trevor
As blowlamp says mount parting tool upside down


rear parting

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

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at

Latest Forum Posts
Support Our Partners
Eccentric Engineering
Rapid RC
Eccentric July 5 2018
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