JB Weld

[mickParticipant @mick65121]

I've just bought an 1920/1930 bench shaper, which is in suprisingly good over all condition. About a third of the clapper box slide castings has snapped cleanly and has been repaired with a piece of bent sheet metal, with screws through to the broken and intact pieces of the casting, must have been repaired years ago as they used square headed screws. The fracture between the two pieces of casting is clean and the two pieces sit quite firmly together. My question is: has any one repaired a working casting with JB Weld and if so was the bond tough enough to be considered totally repaired. The only other option would be to braze the pieces together, but there is the chance of the parts moving during this process.

[mickParticipant @mick65121]

[john kennedy 1Participant @johnkennedy1]

A photo would help .. As far as I'm aware it is some sort resin with metal bits in it. OK for filling holes etc and would probably stick 2 nice flat surfaces well,but an edge joint with any bending or shearing forces,I doubt it. Anyway the bent metal seems to have done a good job up to now,unless you want to pretty it up.Or get a casting made , be a good job to do on the shaper.

[JasonBModerator @jasonb]

I've certainly used it to fabricate parts of engines which have stood upto subsequent machining but I don't think I would want to subject it to the stresses on a clapper box. Also being quite thick you would have a job getting the two parts to sit back together once a layer had been applied to the fracture.

I think I would drill some dowels through the fracture to give some strength plus a couple of threaded fixings then bolt it together with the JB Weld just filling any slight gaps.

J

[Sub MandrelParticipant @submandrel]

As you have a plat to jig the two parts in place, why not try brazing or welding? I've sucessfully silver soldered cast iron but I'm not sure it would be strong enough. You could get someone skilled in the art to weld it with CI sticks, or sifbronze it.

Neil

[mickParticipant @mick65121]

I've used JB Weld before and it does give a very strong bond, the advertising says "don't bin it JB weld it" so I was hoping some one had put it to a real test. I fully intended to drill a series of small holes along both faces of the fracture to act as a key. Can't use the fixing plate as a jig, as it would obscure the area to be brazed/ welded. I'll give it a go over the weekend and see if it stands up to the advertising claims.

[_Paul_Participant @_paul_]

I remember the JB weld display stand in our local motor factors years ago had a display where they had stuck two motor car valve heads together…no one ever broke them apart.

I have five Shapers, these machines are subject to very high (interrupted) cutting forces.

If it were me I would CI weld using a Nickel rod of some sort.

Paul

[Trevor Drabble 1Participant @trevordrabble1]

Mick,

I have some CI sticks available for welding CI with Oxy-Acetylene. If you can find anyone local to you to do the work, then would post to you. I have used them to weld a 6" bench vice and they have worked well for a number of years. Please be aware though, the process is "heat hungry". I pre-heated extensively and then needed a No25 nozzle to do the actual weld. Afterwards the assembly was then put into a bin full of sand to slow the cooling process. In addition,please note that in such a stressful application, even Nickel rods require careful application if ultimate cracking is to be avoided. As an alternative, in some magazines such as Vintage Spirit and Old Glory I have seen adverts for companies who specialise in CI welding. Perhaps this would be a more viable option? Also, have you tried asking JB for their advice on this application? Hope this helps.

Trevor.

[michael coleParticipant @michaelcole91146]

I have done a very similar repair to a shaper clapper box using JB Weld and two studs. It is still working fine after 2 years since the repair.

Mike

[mickParticipant @mick65121]

Thanks for all the input, think I'll try the easy option first and fall back on the welding if the bonding and pinning fails.

Mick

[mickParticipant @mick65121]

This is the first attempt at posting photos, so please forgive the presentatiom.

The first is the repair to the tool slide casting.

The second is the two pieces centre drilled to act as a key for the bond.

Next, after 24 hours the bonded casting is pinned with 1/8th sliver steel secured with bearing lock

Last, the new repair.

Edited By David Clark 1 on 10/09/2012 10:18:47

Edited By David Clark 1 on 10/09/2012 10:19:44

[Sub MandrelParticipant @submandrel]

If that's a strong as it looks good, you can be proud.

neil

Edited By Stub Mandrel on 09/09/2012 21:05:33

[SpringbokParticipant @springbok]

Why are these blasted adverts getting in the way of the readable text come on you geeks who manage this site, sort it out. it is as bad as haveing to do shift enter to do single space instead of doing just enter and then you get double space. DUHH !!! as Homer would say…

Bob

[David Clark 13Participant @davidclark13]

Hi Sprinbok

The geeks do not read this website.

regards David

[Gordon WParticipant @gordonw]

Back to JBWeld, does anyone know if it's any good as a sliding surface, assuming a smooth finish? This would be for a reciprocating motion, slow speed, to act as a grease seal.

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