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Cast red brass smoothness

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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Cast red brass smoothness

Unread postAuthor: Kobl » Fri Jul 25, 2008 2:11 pm

I'm ordering some brass nipples off McMaster for my newest cannon and I need to know whether or not cast red brass nipples are smooth on the inside.

Anyone have any experience?
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Unread postAuthor: SpudFarm » Fri Jul 25, 2008 2:22 pm

the brass nipples we get in norwas has something that can look like a seam on the inside..

if you want to set a piston in there - go4it
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Unread postAuthor: Kobl » Fri Jul 25, 2008 3:00 pm

Well, its just that it needs to be SUPER smooth because I'm using rubber rod as the piston which is (hopefully) exactly 1 inch in diameter and the inner diameter of the nipple is 1.049 inches so if its rough at all it won't slide.
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Unread postAuthor: Eddbot » Fri Jul 25, 2008 4:25 pm

my bad...got confused...
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Last edited by Eddbot on Fri Jul 25, 2008 5:56 pm, edited 1 time in total.
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Unread postAuthor: Kobl » Fri Jul 25, 2008 4:44 pm

it's brass...

specifically, McMaster # 4568K221
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Unread postAuthor: iknowmy3tables » Fri Jul 25, 2008 4:47 pm

I don't have experience with mc master ones, but I'm sure thet are, waht size are they maybe you can bore it with a drill if it isn't
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Unread postAuthor: Kobl » Fri Jul 25, 2008 4:49 pm

It's 1 inch.
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Unread postAuthor: SpudFarm » Fri Jul 25, 2008 4:57 pm

no i can try to get a pic of the inside of one of the nipples we get.
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Unread postAuthor: Sticky_Tape » Fri Jul 25, 2008 5:08 pm

These are the threaded ones right? The ones I can get at home hardware are smooth on the inside yours might be different but I remember someone here said they use them (The brass nipples) for a piston housing because the insides of them are smooth. I believe that the one you are going to order is the same way.
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Unread postAuthor: Kobl » Fri Jul 25, 2008 5:19 pm

I hope you guys are right, I'll be ordering my stuff from Mc-M's tonight (maybe).
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Unread postAuthor: SpudFarm » Fri Jul 25, 2008 5:40 pm

you can use some 1" copper pipe with threaded adaptors on the ends..
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Unread postAuthor: Kobl » Fri Jul 25, 2008 5:41 pm

It would take up too much room, I'm aiming for a fairly compact design.
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Unread postAuthor: frankrede » Fri Jul 25, 2008 7:00 pm

Its cast, therefore its safe to assume its not going tp be that smooth at all.
Look in a steel fitting....
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Unread postAuthor: Sticky_Tape » Fri Jul 25, 2008 7:03 pm

The seam in a steel fitting is a weld line other than that I find that the inside of steal fittings are smooth these nipples are different there isn't a weld line and is smooth right around
frankrede wrote:Its cast, therefore its safe to assume its not going tp be that smooth at all.
Look in a steel fitting....

He never says it is cast it might just be brass pipe cut and threaded.
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Unread postAuthor: Kobl » Fri Jul 25, 2008 7:08 pm

Hmm, well they're not toooo expensive, so I might as well give it a shot, I'm also really excited about my solid rubber piston. I think I'm going to start a build log for this cannon.
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