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Threading ABS

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Threading ABS

Unread postAuthor: demilus » Tue Aug 14, 2007 10:14 pm

I am currently working on a new project. It is a metered propane combustion launcher built out of ABS cell core pipe. Can I thread my meter directly into the ABS? I haven't worked extensivley with ABS, as I
usually use pressure rated PVC.

Thanks
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Unread postAuthor: Pilgrimman » Tue Aug 14, 2007 10:17 pm

Umm... isn't celllular core pipe just laminated foam?
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Unread postAuthor: hi » Tue Aug 14, 2007 10:17 pm

i did and i never had any problems.

spudblaster thinks that may be the way his failed, but i think it would be safe it you threaded it into the femal adaptor and the pipe rather than just the pipe itself.
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Unread postAuthor: SpudBlaster15 » Tue Aug 14, 2007 10:46 pm

You can thread into ABS without problem, if you use a tap to cut the threads, and don't over tighten the connection. Attempting to force the meter fitting to cut it's own threads may cause the pipe to crack, as will over tightening the fitting. You don't have to leave the connection loose, but once you begin to feel resistance on the threads, do not tighten the connection more than one additional turn.
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Unread postAuthor: demilus » Wed Aug 15, 2007 6:58 am

Thanks guys, I just wanted to be sure. Whenever I thread into a cannon, I try to go through the pipe and a fitting. I should also teflon this like always, correct?
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Unread postAuthor: DYI » Wed Aug 15, 2007 8:20 am

It may be in your best interests to use solid wall ABS pipe. It is easy to find in most places, and is a lot safer than cellular core pipe.

I have tapped threads into solid wall ABS for propane meters before, and you shouldn't have any problems as long as you follow SB15's advice. I don't know how well tapping threads would work on foam core pipe though, since it's basically just a layer of foam sandwiched between two thin layers of solid wall pipe.

If you want it to be airtight, you should put teflon on it, and its really not that much extra work anyway.
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Unread postAuthor: CannonCreator » Fri Aug 17, 2007 10:25 pm

ya dde that will be completely fine. Just make sure that ABVIOUSLY drill a hole smaller then the fittings diameter thats going to be getting attached to the cannon, So that when your screwing in the fitting it creates threads for itself. (Im sure you were going to do that, just making sure)

O and if you think thats not enough to hold in the metering system (Which im sure it its) Depending on the threads on the fitting thats going to be screwed into your cannon, You might be able to add a nut on the part of the fitting that is inside your cannon. But you don't Have to, It would just insure longer, and safer use.

HOPE EVERYTHING WORKS OUT! :D
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