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Old September 18, 2012, 09:51 AM   #13
BobGee
Junior Member
 
Join Date: September 18, 2012
Location: Sydney, Australia
Posts: 1
Ball size

Hi Unclenick, Thanks for the advice in your attachment (Crown Ball Lapping2.PDF). I shall be re-crowning my Walther GPS-C barrel using it this weekend.

However, although this post is old, for the sake of posterity I think I should mention that the formula for choosing the lapping ball size is incorrect. The diameter (phi) should be: D/sin"theta", not 2D/sin"theta".

Thanks again for the info.
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