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

coventry die head m8 1.25 1/2"

All Topics | Latest Posts

Search for:  in Thread Title in  
lug lord27/12/2017 18:15:45
avatar
60 forum posts
20 photos

I thread a lot of 8mm stainless 316 did a bar today and i noticed the 1st cm of the thread is just mashed like its been ground down the nut just slips over the end . I had to cut this off and re cut a chamfer on the thread afterwards is this because maybe chasers are not sharp enough cant figure out whats gone wrong.

the rest of the thread was ok just that 1cm was no good almost like a mm had been turned off the end

thanks

Nick Hulme30/12/2017 21:26:23
750 forum posts
37 photos

It sounds like it didn't initially feed correctly and because of that stripped off material down to the base diameter of the thread.
How do you prep the bar end for threading?
I'd be tempted to try a test piece and if that works OK just put it down to an unknown variable.

- Nick

lug lord30/12/2017 22:01:14
avatar
60 forum posts
20 photos
i use a chamfer tool to cut a neat chamfer on the end of the bar . I think maybe next time i will cut a lighter cut on the first pass then re adjust for a final cut see how that works out
lug lord30/12/2017 22:01:52
avatar
60 forum posts
20 photos
i have also changed the chasers for what look like sharper ones
JohnF31/12/2017 11:03:05
avatar
1243 forum posts
202 photos

Hi don’t forget there is a roll over lever on your die head so you can take a 1st ans 2nd cut no adjustment between cuts is necessary

John

lug lord31/12/2017 11:25:17
avatar
60 forum posts
20 photos

cheers yes i do use the lever but i might try taking lesser cuts 1st pass .my chasers are not the correct rake for stainless steel so might be hard on them i believe i should use am5 or as but i am just using the standard s20

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 www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Shopping Partners
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

 

Donate

donate