JB Weld

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JB Weld

This topic has 14 replies, 10 voices, and was last updated 10 September 2012 at 11:45 by Gordon W.

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5 September 2012 at 17:19 #97801
mick
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@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.
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5 September 2012 at 17:19 #15593
mick
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@mick65121
5 September 2012 at 17:55 #97803
john kennedy 1
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@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.
5 September 2012 at 18:21 #97806
JasonB
Moderator
@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
5 September 2012 at 21:43 #97824
Sub Mandrel
Participant
@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
6 September 2012 at 07:55 #97838
mick
Participant
@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.
6 September 2012 at 08:46 #97841
_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
6 September 2012 at 09:54 #97845
Trevor Drabble 1
Participant
@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.
6 September 2012 at 10:15 #97847
michael cole
Participant
@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
6 September 2012 at 13:00 #97856
mick
Participant
@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
7 September 2012 at 17:25 #97912
mick
Participant
@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
9 September 2012 at 20:56 #98055
Sub Mandrel
Participant
@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
10 September 2012 at 08:47 #98082
Springbok
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@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
10 September 2012 at 10:20 #98094
David Clark 13
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@davidclark13
Hi Sprinbok

The geeks do not read this website.

regards David
10 September 2012 at 11:45 #98104
Gordon W
Participant
@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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