Gunsmithing Anyone here do EDM hole cutting on barrels?

sirhrmechanic

Command Sgt. Major
Full Member
Minuteman
Looking for someone who can EDM cut about 12 - 16 holes in a rifle barrel. They will go all the way around the barrel and are a pressure relief/diversion. Holes will be about .1875" in diameter and round. Need to do 2 barrels. I can post or send a print if needed. But here is roughly what I am looking for.

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^^^ These holes are a bit large, but are on a prototype c. 1940's. Above is the print and the holes are about 3/16th. .1875 ish. Not too critical... so large tolerance on these.

If anyone can do this or has a good source... let me know!

My backup plan is to cut most of the way through with a drill and then do the 'breakout' cut with a mill. But that still risks having some burrs in the rifling.

Cheers,

Sirhr
 
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If you don't go the EDM route, Cogsdill makes internal de-burring tools (Burr-Off). There are some limitations on minimum bore diameter, which vary depending on the hole diameter, unless you modify the tool. New products have gotten expensive in the last few years, especially for single or low quantities, but look at places like Ebay for used ones.

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A friend insisted I mill some ports in 3 rifles for him. Similar to magnaporting. I said he will get burrs inside but he insisted.
So I made a few small endmill with a 45degree helix. The idea being that the drastic upcut would leave the burr on the top. It worked pretty good! A real gunsmith thought it looked usable. Without a Cnc it is hard to do that in a circle though.

An alternative is actually contact Magna Port. I believe they do EDM.

 
A friend insisted I mill some ports in 3 rifles for him. Similar to magnaporting. I said he will get burrs inside but he insisted.
So I made a few small endmill with a 45degree helix. The idea being that the drastic upcut would leave the burr on the top. It worked pretty good! A real gunsmith thought it looked usable. Without a Cnc it is hard to do that in a circle though.

An alternative is actually contact Magna Port. I believe they do EDM.


Thanks! I tried Mag-na-Port a few years ago and they only do... Mag-na-porting. Not specialty.

But appreciate it!

Cheers,

Sirhr
 
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This is what structured barrels does in Arkansas. Reach out to John and ask him.

Thanks! I know John well and have been to his shop! I don't remember him having EDM, but I'll definitely reach out!!! He has another barrel underway for me. Great stuff they do!

Cheers,

Sirhr
 
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