I am interested in grinding a HS steel tool for cutting great crowns. Looking for a shape that will enable me to cut a 45* chamfer without leaving burrs after I have cut the face. If someone could post a picture of theirs, I would appreciate it.
Thanks,
Pete
Either HHS tool pictured will work.
Notice the extreme secondary clearance to allow clearance in the bore when machining from inside to OD.
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Pete
Here is a HSS crowning tool that Dave Kiff sells
Michael
Pete
I use a really small carbide boring bare. Insert is a CDCD . I cut 30 degree chamfers on crowns all the time. Good friend of mine just placed 7th in the two gun at the east west shooting one. i think its pretty safe to say, it will work. I see nothing wrong with a 45 Degree chamfer either. I actually think its a good idea. On my personal stuff i usually use an inside out, straight sharp crown. They shoot well, but as you know can be very delicate. Having the resources to re cut at any time, i dont worry much about it. Lee
jerry
if dialed in properly why would there be any angular differences? am in not following what your describing properly? lee
at two points
Yep. Chamber neck and within about 1/16" of the muzzle bore exit.
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For most production crowning, piloted HSS cutter.
Otherwise, this work well for me with recessed target crowns and where a "non-standard" (other than 11°) is desired. I believe PTG sells it as well.
http://www.brownells.com/gunsmith-t...e-bits/barrel-crowning-lathe-bit-prod717.aspx