Accu-Cut introduced diamond bore sizing to powder metal connecting rods with 0.006” stock removal  in 1990 and has since been the industry leader.  With a 0.003” stock removal, our 6-pass process (3-pass pin, 3-pass crank) can achieve a roundness of 0.00005”, surface finish of 8 Ra, bore size CPK > 2, and cycle time of < 10 seconds.  Our process also corrects bend and twist.