I am making two suppressors on ATF form 1's next year. My first can had welded on end caps, but I decided I need to use threaded on caps for my next two projects. I will be using aluminum tubing and bar stock. The tubing is 2" wide and has 1/4" walls.
I have yet to decide the exact dimension of the threads, but I want to cut about half way into the tube wall cutting the threads. I am thinking of ordering a small 60 degree thread cutting tool bit from a mail order catalog.
Is a slow speed the best way to cut? I can only get my lathe down to about 180 rpm. Maybe a variac can slow it down a bit. I practised a little using a 90 degree tool, and wound up with threads that were rather rough. How do I avoid rough threads? Since the end cap will center itself on the barrel using a shoulder cut into the cap I do not have to worry about slightly uneven threads. I would use a tap/die if I could get them cheap, but any tap/die over an inch will cost 3 times more than all the materials I am using to build the suppressor. I will be using a steady rest to hold the tube in position while cutting the threads.
Any other suggestions? Thanks.
Ranb
I have yet to decide the exact dimension of the threads, but I want to cut about half way into the tube wall cutting the threads. I am thinking of ordering a small 60 degree thread cutting tool bit from a mail order catalog.
Is a slow speed the best way to cut? I can only get my lathe down to about 180 rpm. Maybe a variac can slow it down a bit. I practised a little using a 90 degree tool, and wound up with threads that were rather rough. How do I avoid rough threads? Since the end cap will center itself on the barrel using a shoulder cut into the cap I do not have to worry about slightly uneven threads. I would use a tap/die if I could get them cheap, but any tap/die over an inch will cost 3 times more than all the materials I am using to build the suppressor. I will be using a steady rest to hold the tube in position while cutting the threads.
Any other suggestions? Thanks.
Ranb