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adrianschlatter / threadlib

thread library for OpenSCAD
BSD 3-Clause "New" or "Revised" License
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First try at Glass Packaging Institute threads #78

Open alainchiasson opened 1 year ago

alainchiasson commented 1 year ago

I have added GPI-33 (common plastic bottle top) and GPI-63 (bud light glass base).

I still need to review a little more and add to the general readme ( a description )

alainchiasson commented 1 year ago

Will verify what changes I missed from develop.

adrianschlatter commented 1 year ago

Hey @alainchiasson

Do you have a drawing or a norm you derived the thread_specs from? My search ended at a paywall.

alainchiasson commented 1 year ago

I started GPI-63 before I new there was a spec - to replace a cracked bottom of a "bud light goal lite glass". I then found out about the GPI spec. While I have not found the exact spec - I found sheets from other companies - for example: https://www.thecarycompany.com/media/pdf/specs/57W63F.pdf for the 63mm and https://www.thecarycompany.com/media/pdf/specs/68WF34.pdf for the 33mm.

As well as measurements that I have taken. All of these are 6tpi - the 33/63 mm is the outer diameter of the threads on the neck. Right now, I wanted to get one to fit right. https://www.pipelinepackaging.com/cap-and-neck-finishes

So are these "as spec" I would not say so - and beyond what I have on hand, I can't validate everything.

alainchiasson commented 1 year ago

It may be better for me to do this as a separate project or repository instead of integrating it directly, at least until there can be a consensus that it is correct enough. The spec does seem complex and goes way beyond just the thread, but also tolerances for pressure : https://cnocoutdoors.com/blogs/blog/lets-talk-about-threads.

One of the links leads to this: http://file.yizimg.com/175706/2012051520551543.pdf

For me, I'm just trying to easily make things that screw on things I already have. This project has been very useful to me, I figured I would give back.