Paintball

[LK-13]

here these guy might have it:
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[Z50]

I can't really follow this thread; are you trying to get a 1/4 by 28 tpi hole to accept a 1/16"ish auto cocker tube?

If that is the case, my suggestion is for you make your own hose barb. It shouldn't cost you more than an hour and $1.00; go to go to a hardware store and buy a bolt of the material of your choosing (mine would be stainless) of the proper threading (1/4 by 28 tpi) and long enough that it has a thread less portion towards the head. Chuck the bolt in a hand drill or drill press (assuming you are in a similar position as myself and do not own a lathe) such that the chuck is holding the threads but not marring the entire threaded portion. Cut the bolt head off of the bolt and use various files to shape the un-threaded portion bolt into a barb. Remove the bolt from the drill and place it in a bench vise so that the same threads that were damaged by the drill are being held in the jaws of the vise. Drill the barb out for air flow starting at the shaped end to ensure that you get the hole right down the middle of the barb; drill deep enough so that when you cut the damaged portion of the threads off your hole will extend past the cut. Cut the bolt off while it is still in the vise, the remaining portion should resemble a 1/4 by 28 tpi barb with a rough back. Finish by smoothing out the back side with a file, you can counter sink the hole from the back for a fancy look and smoother air flow.

EDIT: you will probably want to file some wrench flats onto the side before cutting the barb, this will give the vise somewhere to hold the barb while you file the back side and some way to install the barb.

[Mayvik]

Originally Posted by Z50

I can't really follow this thread; are you trying to get a 1/4 by 28 tpi hole to accept a 1/16"ish auto cocker tube?

That's basically the point, yes. I'm not sure I trust myself to dremel/file a hose barb without it mangling the hose when it's installed, but I suppose I could try since $1 for a pack of bolts < $100 in custom pneumatics parts. As usual, tinker mentality does not always lead me to the simplest solution!