Worn taper pivot pin
Gray62 | 13/05/2014 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 |
Ady1 | 13/05/2014 11:35:01 |
![]() 6137 forum posts 893 photos | May help “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 |
Ady1 | 13/05/2014 14:52:56 |
![]() 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 |
mick | 13/05/2014 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. |
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