openclassterror Posted September 19, 2013 Share Posted September 19, 2013 Just wondering if anyone has done this. I have a 5.25 XDM, and I noticed when I threaded it for a comp that the material is really hard and gummy about .02 deep from the nitride. Nearly impossible to cut with HSS, used carbide. I am thinking that if I drill a popple hole, it will push a gnarly burr into the bore, and a reamer will not peel it out since the interior of the barrel is also nitride. Thinking about pecking the hole in with a 1/8 carbide end mill. Any thoughts from someone who has fought this? Tom Link to comment Share on other sites More sharing options...
openclassterror Posted September 20, 2013 Author Share Posted September 20, 2013 Ok, so I am not the most patient person in the world. After I got the last customer outta my shop for the day, I set it up in my mill. 1/8 carbide ball end mill cut great! Started at about 2K rpm, dropped it to 700 as it started to break thru because it began to chatter. Looked Beautiful! Re-assembled with the comp, test fired into the bullet tube, still a little up-n-down. Opened up to 3/16. Used a ball end mill again, but had to drop all the way to 450 rpm to keep it from chattering. Still no burr though! Muzzle flip is just about non-existent now. So, now the next guy knows! Sharp carbide ( I used TiAln coated), low rpm, steady pressure. Make sure to keep the chips clear so the cutter doesn't rub. Tom Link to comment Share on other sites More sharing options...
stardust tommy Posted September 20, 2013 Share Posted September 20, 2013 Thanks for sharing this info, I'm not a machinist but I've got a milling machine at home... Link to comment Share on other sites More sharing options...
wes777 Posted September 20, 2013 Share Posted September 20, 2013 Just wondering if anyone has done this. I have a 5.25 XDM, and I noticed when I threaded it for a comp that the material is really hard and gummy about .02 deep from the nitride. Nearly impossible to cut with HSS, used carbide. I am thinking that if I drill a popple hole, it will push a gnarly burr into the bore, and a reamer will not peel it out since the interior of the barrel is also nitride. Thinking about pecking the hole in with a 1/8 carbide end mill. Any thoughts from someone who has fought this? Tom The GUNSMITHING forum would have been better for your query. Link to comment Share on other sites More sharing options...
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