home made c-clamps for gluing plates to rims

Got a new way of doing something? Or maybe an old method that needs some clarification.

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Mark McLean
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home made c-clamps for gluing plates to rims

Post by Mark McLean » Tue Oct 08, 2013 5:22 pm

So you are gluing a soundboard or back to the rims - what is the best way to clamp it?
I know some like spool clamps. I have previously used the go-bar deck, but that is a bit fiddly to get around it on all sides and chase the glue squeeze-out.
I recently saw a post to a video on one of the forums (but I am buggered if I can find it again now) with a nifty trick. It showed the workers at a small Spanish classical guitar maker using clamps that were each made from a piece of wood bent into a circle. It wanted to spring closed, but you could prise it open to form a spring clamp.

It got me thinking.
c-clamp 1.jpg
c-clamp 1.jpg (111.32 KiB) Viewed 6828 times
A piece of 150mm PVC stormwater pipe, cut in slices about 30mm wide, and opened on one side. It makes a c-clamp with the right width to span the sides of a guitar, and with a good degree of spring-back to provide clamping force. You just need to put some padding on the ends. I bought a length of foam water-pipe insulation from the plumbing section at Bunnings ($1.50 per metre) and attached it to the clamps with cable ties. or elastic bands when I ran out of those (the elastic bands are probably better).
c-clamp 2.jpg
c-clamp 2.jpg (87.4 KiB) Viewed 6828 times
One metre of pipe ($30 if you buy it new, but I had some lying around), 2 metres of foam ($3) made 30 clamps, which is enough to clamp the whole perimeter of a guitar. Unit cost $1.10
c-clamp 3.jpg
The guitar is sitting on a block of wood to lift it free of the benchtop. You can apply the clamps with one hand, in a matter of seconds. And I like the way that they give you plenty of clearance to wipe up glue squeeze-out (unlike a spool clamp). And the guitar can stay in the mould - the clamps wrap around.
For a uke you could probably use 100mm or 90mm pipe, which is about $5 per metre

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Craig
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Re: home made c-clamps for gluing plates to rims

Post by Craig » Tue Oct 08, 2013 7:34 pm

Geez ! looks like another banning :wh


Simple and effective . Great work Mark :cl
Craig Lawrence

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martintaylor
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Re: home made c-clamps for gluing plates to rims

Post by martintaylor » Tue Oct 08, 2013 8:19 pm

And this is why I love this forum. Creative solutions to common problems. Love it.

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charangohabsburg
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Re: home made c-clamps for gluing plates to rims

Post by charangohabsburg » Tue Oct 08, 2013 11:45 pm

That's a great alternative to the good old bed springs! :cl

(Only probable downside I can see: there will be a little problem when trying to re-heat hot hide glue with the heat gun).
Markus

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It's only the others who suffer.

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Mark McLean
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Re: home made c-clamps for gluing plates to rims

Post by Mark McLean » Wed Oct 09, 2013 6:53 am

I am glad you like it. They are not in the Craig Lawrence school of luthier jig artistry - but cheap, simple and effective. You are right Markus - it could get messy with the heat gun.

If anyone is going to make some, I suggest that you try a few different thicknesses when you slice off the first few. If you make them too thin they have less spring. I wasn't happy with them at 20-25mm, but they seem good at 30mm. If you want really stiff ones, go to 50. Your brand of pipe might have different wall thickness or a different plastic - so your mileage might vary.

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kiwigeo
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Re: home made c-clamps for gluing plates to rims

Post by kiwigeo » Mon Oct 28, 2013 12:36 pm

Those clamps would be really handy in the operating theatre
Martin

Mark Fogleman
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Re: home made c-clamps for gluing plates to rims

Post by Mark Fogleman » Tue Oct 29, 2013 5:12 am

Elegantly simple, compact, available free at most construction sites or very cheap. What's not to like! :cl

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Re: home made c-clamps for gluing plates to rims

Post by simonm » Mon Nov 04, 2013 12:17 am

Great idea. Thanks.

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