Question re delrin.
Will a delrin tube with walls 2mm thick expand when subjected to an internal pressure of 3000psi?
If yes, how thick would the walls need to be to suffer zero expansion?
TIA for any answers or speculation. 🙂
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Viewing 9 replies - 1 through 9 (of 9 total)
Lang:
Look up” Barlows Formula” on the web.
Read up on it.
It is a way of calculating the strength of pipes (or tubes of delrin).
Look up the tinsile strength of Delrin, you will need this information to use the formula. (I believe its 8,000 PSI).
Doing the work you are doing, knowing this info may save your life!!
Your gonna blow yourself up, fooling around with weak materials, and high pressure air.
Barlows Formula is really not that hard to use.
Try this calculator:
http://www.texaspipe.com/barlows_formula.html
Mark
Machining titanium isn’t that difficult. Depending on what type offcourse. Use Hss that’s sharp!!! And easy does it.
Cheers
http://www.smallparts.com/s/192-9346924-9246654?searchNodeID=16310161|468240&keywords=titanium+tubing&x=0&y=0&Action=submit
Yeah, it’d do my cutters up well too. 😆
Titanium tube would do you up well
http://www.smallparts.com/s/192-9346924-9246654?searchNodeID=16310161|468240&keywords=titanium+tubing&x=0&y=0&Action=submit
Cheers Marc.
It failed anyway. Me being a prick again, thought the vacuum-force was derived from the bore, not the overall OD of the shaft ( 😳 ). So I had a 10mm OD shaft popping through a 10mm aperture in the bottom of the valve and wondered why the fecker wouldn’t open. Tee hee. 😆
The valve-body was useless as it was anyway, so it was an inexpensive experiment. I’ll now make a delrin plug to force-fit into the hole and cut a new aperture in the delrin, then try my idea again with a far thinner shaft (steel this time).
Delrin is actually pretty brittle for a plastic. So the worst that could happen is delrin shrapnell in your face. Difficult to spot on x-ray or metal detector. So I’d stick with steel for your valvestem!
Regards,
Marc
Duh. 😳
OD of 10mm, ID of 6mm. Approx length of 50mm. It’s for a valve-stem.
I can go with an ID of 4mm (area of 12.56, more than enough), so the walls will be 3mm thick. I’m just about to knock one up and give it a try. The worst that can happen is a tank-dump.
With an ID of 4mm and zero occlusion (the occlusion is usually a seal-bearing rod) the area is there, it’s just a question of whether enough air can be delivered fast enough. If not I’ll bore it out to 5mm and try, then 6mm and try again.
Cheers Marc.
One needs to know inner or outer diameter to give a educated guess.
So if you could specify what you need it for?
Cheers,
Marc
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Thanks for the link Mark!