A 3/16″ reamer going 1″ deep in 304 stainless should run 458 rpm and 2.75 ipm feed. Chipload is 0.0015″. For comparison, here is the same cut with a 3/16″ HSS Twist Drill: Twist drill is 703 rpm (a little less than 2x the reamer), and 1.863 ipm (reamer is feeding a little faster). Okay, those numbers are neither 1/2 nor 1/3, though