Gunsmithing Machining a nitrided part

[ddavis]

I just received the brake for my brake attach 30 caliber TTF Archangel. The problem is that this particular brake will be going on a 6.5x55 with a sporter barrel, which is threaded 1/2x28 due to the light barrel contour.

The brake is threaded 1/2x28, and not surprisingly, the only way to get this thread pattern was to get a .223 brake. The bore of the brake is very close to .264 and needs to be opened up a bit. The problem is that the brake has been nitrided/melonited/etc. I have a friend with a lathe that can do this. My question is about machining something this hard. Am I going to need to replace his cutting tool after this job? What tools do you use for say, machining a Glock slide? Any insight is much appreciated.

-Dan

 

[JJones75]

It is hard but not terrible , use a carbide tool and make your first cut at least .015" , that will get you down past the heat treated section.
A 9/32 carbide drill is another option. Assuming the original hole is true to the threads the drill will chase the existing hole. I've heard of people drilling Melonited parts with cobalt tools with little issue just use lower RPM and more pressure forcing the tool to cut and not rub any

 

[HodgdonExtreme]

A little carbide boring bar and traditional use of the lathe will have you up and running in no time.

It is possible with HSS tooling, but it'll put a hurtin' on the tool in a hurry.

 

[MikeEzell]

Here ya go.
shars.com - 02840 Solid Carbide Chucking Reamer

 

[ddavis]

Thanks for the info guys. He may already know all of this, but I just wanted to make sure it was doable before I ask for his help, and Google wasn't able to give me an info.

Regards,
-Dan