ROTTLER (Precision Counterboring and Finishing) cutting insert 9.52 mm - radius 0.4

RT321F (Precision Counterboring and Finishing)

A 3/8” (9.52 mm) IC triangular, uncoated insert with a 1/64” (.4 mm) cutting radius. Gives the best finish results when machining precision counter bores often machined in diesel engine blocks. The 1/64” (.4 mm) radius should be used when machining to a step where the mating part requires a smaller radius to eliminate an interference problem. If you are machining a long bore where the spindle must be extended towards the limits of its travel or if a long stub bar is being used, the 1/64” (.4 mm) radius will minimize the possibility

of chatter. A feed rate of .002” - .005” (.05 mm - .12 mm) should be used to obtain a typical surface finish. When machining large counter bores typically found in heavy duty diesel blocks, a feed rate of .002 - .004/ rev. (.05 mm - .1 mm/rev) should be used.