The first design
The second design with milling file
milling in Shopbot
roughing toolpath:
ball nose 1/4”, pass depth 1/2”, step over 1/8” 50%
spindle speed 9000 r.p.m, feed/plunge rate 10 inches/sec
finishing toolpath:
ball nose 1/4”, step over 0.0375” 15%
spindle speed 9000 r.p.m, feed/plunge rate 10 inches/sec