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PostPosted: Thu Sep 22, 2016 4:48 pm 
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Hi, I’m making a little dolly to run along some tracks and I need to be able to slide the smaller, 27mm, scaffolding tubes through it sometimes so I’ll cut holes in either side. Then I’ll need to find a way to fix them somehow so I thought I’d have this kind of pinch fitting where there is a slit cut and a hole drilled and tapped so that a bolt can be tightened up to clamp the poles in place. I’ve seen this solution about before but am unsure if it’ll work in this circumstance. The metal dolly has 10mm thick walls though that can be made a little larger if necessary and is made of aluminium, any advice on whether this will work if I have the dolly walls cut to these shapes?

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PostPosted: Thu Sep 22, 2016 7:12 pm 
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what material is it made from ?? :dunno:

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PostPosted: Thu Sep 22, 2016 8:00 pm 
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yadnom1973 wrote:
... and is made of aluminium ...


:roll: :thumbleft:


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PostPosted: Thu Sep 22, 2016 10:34 pm 
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if its ally then it would be better with a hinge
otherwise it needs to be loose enough to allow for deviations in the round to slip through
without a hinge this would cause a lot off strain and force when tightening with most off the effort simply closing the gap enough to touch before it grips
or perhaps a bolt each side with a loose enough fit to allow adjustment with both bolts then just one loosened to allow movement

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PostPosted: Fri Sep 23, 2016 9:25 am 
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Thanks for getting back to me. Yes aluminium, the picture has no scale it is just to convey the idea. The hole would be the exact size of the tubing so the gap that has to be closed could be small, something like 2mm. I could thin the left hand side where the metal has to flex I suppose. I have see in before but don't know much about aluminium or metals for that matter. Here's a picture I found:

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PostPosted: Fri Sep 23, 2016 9:30 am 
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Is it possible to make something using the Key Klamp? https://keesystems.com/store/fittings/kee-klamp.html

There are lots of lookalike products that are cheaper

DWD


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PostPosted: Fri Sep 23, 2016 9:45 am 
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Yes this would be a solution but they have to come on and off all the time and these are one time fittings. There is a large grub screw that tightens onto the metal tube to secure it. I need something that will not damage the surface of the tubes and really I'm not convinced for my application about these, I think there would be occasional give and wobble. I need an absolutely tight fit that with make a completely solid unit once tightened up.

I do also need a range of fittings like the ones pictured to rig a frame with this piping. I've searched and searched and can't find anything for these 27/34mm tubing that is reusable.


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PostPosted: Fri Sep 23, 2016 9:46 am 
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Or do you mean adapting a key clamp. that might be an idea.


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PostPosted: Fri Sep 23, 2016 9:26 pm 
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Without knowing more details it's tricky.
I reckon B-A is right, a split clamp with either a hinge on one side or a bolt either side would seem to be the best answer.

A Google image search for "Clamps for 27mm tube" gives lots of results which if nothing else give an idea of what is available, including clamps for industrial use, rc models, and stage lighting. Laboratories also use tube clamps for making up racks.


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PostPosted: Sat Sep 24, 2016 3:35 pm 
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http://www.ebay.co.uk/itm/1-2-1-1-2-BSP ... kvnxdGReCg
http://www.ebay.co.uk/itm/Universal-Exh ... LPEHTj6QHg
http://www.ebay.co.uk/itm/Pipe-Clamp-Ha ... yGZFTzpEJA


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PostPosted: Sun Sep 25, 2016 2:30 pm 
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Thanks for all the advice and links guys, I'm going to mock a little test up and if it doesn't work I'll just have to try and use one of the clamps of eBay you guys have pointed out


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