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Missing Strip Spring Needed

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Martin King 212/04/2019 16:12:36
593 forum posts
211 photos

Hi All, At least I actually know what this fine old tool is for!

It is a rare French leatherworking lasting clamp of some value.

grabclamp 1.jpg

grabclamp 2.jpg

Sadly as can be seen one of the strip type springs is missing and the other is in incomplete shape, it should have little more length and a curl at the top end to bear on the clamp jaw.

I an going to have to take this apart anyway for cleaning and to make new pivot pins as the old ones are too worn, I wll also sharpen up the jaw ghrips a bit.

Can anywone please tell me how to go about making the springs, what material shall I require, heat treatment etc. Never had anything to do with spring construction before. I do at least have a pattern.

Cheers, Martin

Jeff Dayman12/04/2019 16:16:18
1529 forum posts
37 photos

AISI 1080 steel strip, austemper after forming. Varnish after heat treat for corrosion protection.

Circlip12/04/2019 16:16:34
948 forum posts

Piece of clock spring?

Regards Ian.

Martin King 212/04/2019 16:46:26
593 forum posts
211 photos

Thanks guys, how would I rework a piece of clock spring please? I can probably find one of them without too much trouble.

Jeff: Austemper? Details please if possible.

Does one have to 'over bend' the spring to allow for movement or spring back?

Cheers, Martin

Jeff Dayman13/04/2019 01:38:01
1529 forum posts
37 photos

If making the spring in 1080 and austempering, do not overbend - make to pattern. Do not scratch or mark the surfaces of the stock.

Austempering according to the pros that do it every day for industry:

**LINK**

JohnF14/04/2019 19:58:52
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824 forum posts
92 photos

Martin see your PM's

John

JohnF14/04/2019 20:05:49
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824 forum posts
92 photos

Martin sent you a PM

John

Sorry double post Mods please delete -- thanks 

Edited By JohnF on 14/04/2019 20:07:51

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