for Machining Non-Metallic Materials

DAPRA insertable cutters are designed for critical blending of complex contours and shapes

Suggested starting parameters

For additional information on machining with Dapra inserts consult the Dapra catalog

Profiling graphite, carbon, unfilled plastics
Cutting dia. inches	Machine speed rpm	Cutting speed sfm	Operation	Feed rate fpt (in/tooth)
5/16	7,500 to 16,000	640 to 1,320	Rough Finish	.005 – .008 .001 – .004
3/8	6,500 to 13,500		Rough Finish	.005 – .008 .001 – .004
1/2	4,900 to 10,000		Rough Finish	.009 – .015 .002 – .008
5/8	3,900 to 8,000		Rough Finish	.009 – .015 .002 – .008
3/4	3,200 to 6,700		Rough Finish	.009 – .015 .002 – .008
1	2,400 to 5,000		Rough Finish	.013 – .020 .004 – .012
1-1/4	2,000 to 4,000		Rough Finish	013 – .020 .004 – .012
rpm - revolutions per minute; sfm - surface feet per minute. fpt - feed per tooth (feed per cutting edge/flute) per revolution. Feed per revolution (fpr)=feed rate (fpt) x no. of teeth (flutes). Example: .006 fpr=.003 fpt x 2 for 2-flute insert. Feed per minute (fpm)=fpr x rpm. Example: 9" fpm=.006 fpr x1500 rpm.