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Gluing laser cut kits

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Bob Bertram06/07/2020 12:25:05
308 forum posts
27 photos

Does anyone lightly sand the mating surfaces of laser kits to get a decent glue joint? I read somewhere that you should but cannot remember where.

Erfolg06/07/2020 12:40:29
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11781 forum posts
1340 photos

No, I do not.

I guess some argue that there could or will be some residual dust or ash from the cutting process.

Although I have never considered the possibility, nor have I observed any dust, which may be present, I have never noticed it. The box the kits come in do not seem to have any dust in the bottom either.

If there is any dust, I would argue it is trivial, to an extent that the PVA just incorporates it into the joint, without any issue. Likewise with Cyno.

I guess all sorts of arguments ca be made from die cutting and routing, I believe I would remain unconvinced of any problem.

Ron Gray06/07/2020 12:57:20
2229 forum posts
978 photos

But you do get messy fingers!

Erfolg06/07/2020 13:07:52
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11781 forum posts
1340 photos

Ron, what are you really asking?

Bob Bertram06/07/2020 13:11:39
308 forum posts
27 photos

I was thinking more along the lines that the brown/burnt edges do not take glue that well.

Ron Gray06/07/2020 13:26:22
2229 forum posts
978 photos

I must admit that I do wipe the edges to get rid of most of the burn marks but don’t sand.

Bob Bertram06/07/2020 13:34:25
308 forum posts
27 photos

What do you use as a wipe Ron?

Bob Bertram06/07/2020 15:53:25
308 forum posts
27 photos

Have found quite a few threads on the forum regarding this. Why didn't I look first?

Erfolg06/07/2020 16:34:32
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11781 forum posts
1340 photos

I have a small number of models built from laser cut kits. To-date I have no joint failures as far as I am aware.

A reasonable practical test is to take one of the scrap pieces (which has been cut),from the supporting sheets, then glue it edge on, onto a bit of scrap. After the assembly or assemblies have dried, pull them apart. I would suggest a straight pull on one, on another, a shearing, torque type of load.

What matters did the joint fail, or the wood adjacent to the joint. If the joint fails, it matters, if it is the adjacent wood, it does not matter. Adhesives like PVA rely mostly on penetrating the wood for a small distance, when the wood fails it proves the glue has penetrated, and the wood has less strength than the glued joint.

A real test is always much better than hypothesizing.

Edited By Erfolg on 06/07/2020 16:34:53

martin collins 106/07/2020 16:55:56
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429 forum posts
199 photos

Saw this in this months RCM&E, anyone tried it yet? Supposed to be designed for laser cut kits.

**LINK**

Bob Bertram07/07/2020 17:10:21
308 forum posts
27 photos

Thanks Erfolg, some test pieces were what I intended with different adhesives. In fact, I did one a little while ago but wasn't too impressed and being a doddery old twit, I can't remember which glue I used!

Martin, I did spot that and will get hold of a bottle and do some tests. Another glue to add to my armoury.

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