Cast red brass smoothness

[Kobl]

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?

[SpudFarm]

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

[Kobl]

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.

[Eddbot]

my bad...got confused...

[Kobl]

it's brass...

specifically, McMaster # 4568K221

[iknowmy3tables]

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

[Kobl]

It's 1 inch.

[SpudFarm]

no i can try to get a pic of the inside of one of the nipples we get.

[Sticky_Tape]

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.

[Kobl]

I hope you guys are right, I'll be ordering my stuff from Mc-M's tonight (maybe).

[SpudFarm]

you can use some 1" copper pipe with threaded adaptors on the ends..

[Kobl]

It would take up too much room, I'm aiming for a fairly compact design.

[frankrede]

Its cast, therefore its safe to assume its not going tp be that smooth at all.
Look in a steel fitting....

[Sticky_Tape]

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

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.

[Kobl]

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.