Grinding “These parts have a print tolerance of 0.0005" [0.013-
mm] runout. We’ve run these same shafts on other machines and achieved 0.0003" [0.008 mm] from diameter to diame- ter, giving us a Cpk
of 1.394. On our new S33 we are holding 50 millionths from diameter to diameter giving us a Cpk of
3.0134. In fact, when I initially ran this part on the S33 and checked it with my tenths indicator, the needle didn’t even move. I had another operator check the part and he said my indicator must be broken. Then we checked with a 20-mil- lionths indicator, turning the part slowly, and found it to be 50-millionths runout.”
The sixth axis of the ShapeSmart NP6 allows grinding unround parts, eccentric shapes that are off-center, and superhard materials.
keyway on one end. The diameters gradually step down. There are bearing journals on each side that are about 1" [25.4 mm] in diameter. There is a keyway on one end.
Smart Toolmaking Processes
Rollomatic Inc. (Mundelein, IL) has made five- and six-axis GrindSmart tool and cutter grinders since 1995 for produc- tion-grinding end mills, drills, reamers, specialty cutting tools, form tools, inserts, and medical and dental devices including form drills, orthopedic drills, and bone drills. “Recent devel-
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