| Sizing a hole for a glas cylinder [message #39417] Mon, 28 November 2011 22:05 UTC |
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Hello,
I have a hollow glass cylinder which is exactly 10mm in diameter.
I need to fit this cylinder into a hole in my shape; obviously the hole needs to be "10+X" mm in diameter, for some X>0.
What is a good rule of thumb for "X" so that the cylinder fits as close/tight as possible, but is still guaranteed to fit at all without damaging the shape or breaking the glass? It does not need to be air or water tight, but should not give much leeway for movement either.
Do I use the "min details" property of the material for "X"? I.e., for alumide I would make the diameter 10.4mm? Or should I rather forget about making a close fit, and add a plenty large X and use an O-ring for a closer fit?
Thanks!
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| Re: Sizing a hole for a glas cylinder [message #39424 is a reply to message #39417 ] Tue, 29 November 2011 01:29 UTC |
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Honestly, using the "min details" is probably a pretty good rule of thumb. But.. you also need to be aware that certain materials have a shrinkage factor, for example FUD shrinks about 2%
I don't know where to find the shrink amount for each material.. I just remember the one for FUD.
Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
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| Re: Sizing a hole for a glas cylinder [message #39502 is a reply to message #39417 ] Tue, 29 November 2011 17:46 UTC |
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I don't think the "shrink amount" for each material has ever been posted. I'd like this info. And it does vary quite a bit for each material.
Glenn
Glenn ------ My Website Third Dimension Jewellery
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