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[dallen]

(03-26-2015, 04:23 PM)PixMan Wrote: David,

While the grade and "extra sharp" geometry was developed for aluminum alloys. the fact that it's a Titanium Carbo-Nitride coating allows it to work on other materials. I would run the barrel at 250 to 300 surface feet per minute. This will be a good test because with a tapered gun barrel it's a long, unsupported cut and subject to chatter. The sharp edge should eliminate that completely.

A gun barrel taper should be low enough angle to use the offset tailstock method rather than waiting to find a lathe with a taper attachment. You should find one of the "bell mouth" style center drills to drill center holes in plugs you make for the ends of the barrel, offset the tailstock and set taper by checking the "per side" taper with a long travel indicator mounted on your carriage. It's easier than it may sound.

Best of luck.

Ken

I will have access to a lathe with a taper attachment on it in a couple weeks, also the brains of the instructor at the tech school where I have signed on of another round of gunsmithing.

This barrel is only 20 inches long with only about 17 inches planned to be tapers from 1" to .875" just enough to make the barrel look longer then it will actually be.

I only plan to use the inserts to do the final finish pass on the barrel, and your right they are sharp, shop monster wanted to use on to sharpen his gopher hooks with. 

Thanks for the tap calculator.

DA