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Finish concerns on a 11 degree crown - suggestions?

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29 July 2007, 20:26
fireball168
Finish concerns on a 11 degree crown - suggestions?
I'm having a hard time getting a nice finish cutting an 11 degree crown.

I've tried a couple of different barrels, used both my own tools and a Brownell's preground crowning bit.

I've cut all the way down to 125 rpm, and all the way up to 900. My usual speed for crowning is 325-540 at approximately .002"/sec feed rate.

Recommendations?
29 July 2007, 20:43
Westpac
I use carbide exclusively and I run my lathe at 1250 RPM. I would increase the RPM's a little more and make sure the height of the cutting edge is on center with the bore. A higher RPM produces a better finish and is more forgiving when "hand cranking" the compound. If you will PM me your email address, I will send you some pictures of how I set up.


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30 July 2007, 04:33
fireball168
RPM made all the difference in the world.

Thanks!