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

Boxford Shaper - clapper box wear

Worn taper pivot pin

All Topics | Latest Posts

Search for:  in Thread Title in  
Gray6213/05/2014 10:30:46
1058 forum posts
16 photos

My Mk2 Boxford shaper seems to have some wear in the clapper box taper pin which under certain conditions, allows the clapper to lift and the tool glides over the work or chatters.

I have tapped the taper pivot pin in as far as possible but I suspect the pin is too badly worn to take up the play.

I'm tempted to turn/grind up a replacement but before I do, can anyone explain why the clapper pivots on a taper pin and not a straight one?

I suspect it is to allow for wear adjustment but clarification would be good.

Also, does anyone know what the correct taper is, I can make to 'fit' but having the correct taper as a starting point will help.

cheers

Graeme

Ady113/05/2014 11:35:01
avatar
6137 forum posts
893 photos

May help

**LINK**

“The taper pin is designed to be a tight (non-moving) fit on the mount sides and a loose (but shake-free) fit on the clapper.

http://www.model-engineer.co.uk/forums/postings.asp?th=73662

 

Edited By Ady1 on 13/05/2014 11:44:50

Ady113/05/2014 14:52:56
avatar
6137 forum posts
893 photos

I have a boxford shaper operators manual but it has no parts list, only general stuff, and doesn't even mention the clapper box pin

mick13/05/2014 17:10:17
421 forum posts
49 photos

If the pin were parallel then there would have to be a working tolerance between the two, which would mean there would be movement between the two. A taper pin allows the clapper box to move without any movement against the pin. Over the years a degree of wear may occur between the hardened pin and the cast iron clapper box, in which case the two parts, the clapper box and the tool slide should be visited with a taper reamer to re-instate a continuous fit before fitting a new pin.

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
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