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quick question

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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quick question

Unread postAuthor: colty-bear » Wed Jul 15, 2009 12:23 am

how do i tap a tank with a shrader valve and have it airtight to 150 psi plase tell me how
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Unread postAuthor: inonickname » Wed Jul 15, 2009 12:29 am

Topic delete someone?

Mate, you've asked this question at least twice already and I've already answered it.

With a tap and teflon tape.

/topic.
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Unread postAuthor: theBOOM » Wed Jul 15, 2009 12:43 am

Hm you need a tap ... I would recommend a schrader valve that has 1/4 threads ... then you need to buy a 1/4 npt tap and the corresponding drill for it.Next you will need to drill the hole with the corresponding tap drill, after the hole is drilled use the 1/4 npt tap and start tapping the tank, for tapping you can use either a tap wrench or a normal wrench will do just finee. Make sure that while you are tapping go in a couple threads then back... then in 1 or 2 more threads than last time , then back again (ill explain how if you need more detail). After you have the threads ready put some teflon tape on the schrader valves threads ... and thread it in. Make sure you have atleast 3 or 4 layers of teflon tape to get an Airtight seal....

Also make sure you have a pretty thick wall to get enough threads on there if not you wont get to good of a seal :S

I think this is as dumb proof as it gets? :roll:
hope this helped

Boom :twisted:
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Unread postAuthor: colty-bear » Wed Jul 15, 2009 1:28 am

yes thank you
sorry did not know what a tap was(noob) :D
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Unread postAuthor: UKSGC » Wed Jul 15, 2009 1:39 am

But you did a search right?
You tried google and yahoo and a few others right?
You asked at school in shop?

Or you just thought you would let someone else work it out for you again?
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Unread postAuthor: colty-bear » Wed Jul 15, 2009 1:42 am

i dont have school right now
summer break
im only 13 i dont get shop till i go back this august
sorry :oops:
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Unread postAuthor: theBOOM » Wed Jul 15, 2009 1:50 am

Glad I could help colty.. PM me if you have any problems
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Unread postAuthor: UKSGC » Wed Jul 15, 2009 2:47 am

Good work theBOOM Sorry colty-bear woke up grumpy this morning didnt take age into account at all. Good luck with your build buddy.
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Unread postAuthor: inonickname » Wed Jul 15, 2009 2:53 am

As a note, you'll find most schrader valves have a 1/8" NPT thread.

By the way, the tap won't be cheap. If it's only for one gun then you might as well remove the rubber from a schrader and epoxy it into your chamber.

Some things boom missed:

Tap through two layers of PVC (eg. In a coupler)
Always use grease when tapping PVC
Take your time to tap the hole very straight.

You might be better off to go the cheap method
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Unread postAuthor: theBOOM » Wed Jul 15, 2009 3:00 am

Grease in pvc? !?!? O dang I thought that was only for metals :shock:
O well all my taps have gone right without it.. but it won't do anything to damage it in the future I guess :roll:

Boom :twisted:
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Unread postAuthor: jimmy101 » Wed Jul 15, 2009 11:45 am

For tapping in PVC you really don't need a tap.

Just take a piece of scrap PVC and drill a couple different size holes in it. Take your threaded part and screw it into the holes. The hole that it fits the snuggest in, and hence cuts the best threads, tells you what the best size drill bit is.

A tap is better and quicker but really not needed for a threaded metal part into PVC.
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