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What size copper pipe fits marbles??

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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What size copper pipe fits marbles??

Unread postAuthor: cwazy1 » Fri Dec 07, 2007 12:25 am

Im making a marble cannon and i need to know which type of copper pipe fits marbles?

like give me a diameter and also a type of copper. inches please.

i've seen ppl use 1/2" copper but i dont know which type of copper? M or L??
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Unread postAuthor: Hubb » Fri Dec 07, 2007 12:31 am

It depends on the size of your marbles :D

The wiki may provide the answer
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Unread postAuthor: paaiyan » Fri Dec 07, 2007 12:43 am

Yea, the size of the marbles in question is what really matters. Most I think are about a half inch or maybe 5/8. I don't have any to measure at the moment, my psychiatrist says I lost all mine a while back. Or you could shoot those hulking shooter marbles that are over in inch.
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Unread postAuthor: ALIHISGREAT » Fri Dec 07, 2007 2:44 am

Well the pipe class wil have no effect on what marbles fit into it because 1/2" copper will always have a 1/2" id because imperial pipe is measured by the id. However 15mm copper has a 13-14mm id because metric is measured by the od not the id so if you are using 1/2" copper you want 1/2" marbles :)
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Unread postAuthor: mark.f » Fri Dec 07, 2007 6:26 am

ALIHISGREAT, in the imperial system copper is measured by nominal size. 1/2" copper has a constant I.D. of 5/8", and the I.D. changes with the pressure rating.

Use type M copper for marbles. This pipe fits most marbles out of a bag of Wally World craft marbles, (the clear cheap kind).
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Unread postAuthor: Ragnarok » Fri Dec 07, 2007 6:29 am

@ ALIHISGREAT: That would be great, if only the imperial pipe sizes were actually true to their nominal diameter.

The marbles I use are 5/8", but I fire them from a .80 cal barrel with wadding, so you're not too limited.
If you have access to a set of vernier callipers, the problem is easy to solve. Assuming you don't, you'll have to take some marbles to your local hardware store and experiment to find the best fit.
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Unread postAuthor: cwazy1 » Fri Dec 07, 2007 7:49 pm

ahh, okay gottcha,

apparently the marbles i have are a lil under 3/4" so i found an alum barrel that fits mine perfectly =) yay
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