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diaphram help

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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diaphram help

Unread postAuthor: jon_89 » Fri Jul 27, 2007 1:08 am

i have just built a 1 inch coaxial. i am using .125 inch neoprene disk. what diameter should the disk be? is all i need is the disk?
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Unread postAuthor: frankrede » Fri Jul 27, 2007 1:17 am

as wide as your chamber?
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Unread postAuthor: jon_89 » Fri Jul 27, 2007 1:21 am

really cause i read somewhere to make it a little bigger. so i just cut a disk put it in and it will work?
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Unread postAuthor: potatoflinger » Fri Jul 27, 2007 8:28 am

Are you putting the diaphragm in a union? If you are, it has to be the same size as your union.
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Unread postAuthor: spud yeti » Fri Jul 27, 2007 8:35 am

Put it in a union (if you're not already) and make it the same size as the union so the diaphram will hold nicely in place a have a 100% seal.
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really good quote/phrase here
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Unread postAuthor: noname » Fri Jul 27, 2007 10:38 am

DON'T put it in a union. Clearly, most of you have never made or used a diaphragm valve. A union adds cost and bulk to the cannon, and hinders performance. All you need is a female adapter and a male plug.

Get the female adapter, find the ID of it, and cut the disc about 1/8 bigger (1" ID, diaphragm should be 1 1/8" across). Make sure your barrel goes about halfway through the threads of the female adapter. Push the diaphragm in from the middle and go slowly, keeping it even on all sides. When you have it in 1 or 2 threads, screw in the male adapter with teflon tape and the exhaust sytem attached (a blowgun works fine in coaxials up to 2.5").
You're done!
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Unread postAuthor: origin unknown » Fri Jul 27, 2007 11:14 am

I personally think a diaphram in a union is more idiot proof than the male-female adaptor diaphram; if I were an idiot (no offense) I would choose it over the other in terms of simplicity only.
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Unread postAuthor: noname » Fri Jul 27, 2007 2:16 pm

A coaxial diaphragm cannon was my 2nd pneumatic, I got plans for the first online.
http://www.spudfiles.com/forums/extreme ... t2316.html
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Unread postAuthor: Intel Xeon » Fri Jul 27, 2007 2:53 pm

As the resident 'idiot', I say that getting a union adds maybe USD$0.75 to your project. whoop-dee-doo. In Worcester, I can find that on the street. However, If you have experience making cannons, (not me) definitely definitely (redundancy... definitely a sign of idiocy.) go for the male-female adaptors method. Now, time to resume my idiotdom. :confused2:
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Unread postAuthor: noname » Fri Jul 27, 2007 2:56 pm

$.75?!?! I wish! That would make it so much easier for me to make huge hybgrids/burst disc guns. A 2" union in the Bay Area, at the cheapest, is $12-15. A female adapter is $2.99.
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Unread postAuthor: Intel Xeon » Fri Jul 27, 2007 3:00 pm

HAHAHAHAHAHAHAHA! I laugh at you! In the Worcester Lowe's, right by Route 70. A 2" Sch.80 Pressure rated Union is like $4.00 The adaptors are even less! *laughs maniacally* (Remember, I may be wrong. I am a self-declared idiot)
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Last edited by Intel Xeon on Sat Jul 28, 2007 2:41 pm, edited 1 time in total.

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Unread postAuthor: frankrede » Fri Jul 27, 2007 3:20 pm

Union or female adapter, who cares, this is like the difference between stunguns or ignition coils, both work and who cares.
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Unread postAuthor: jon_89 » Fri Jul 27, 2007 7:50 pm

thanks for the input. how big of an eqaulization do you think i need?
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Unread postAuthor: noname » Fri Jul 27, 2007 8:10 pm

If you use a female adapter, you don't need one.
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Unread postAuthor: altxf4 » Sun Jul 29, 2007 3:08 am

Diaphrams don't work...thats how I ended up on this planet!
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