I've been making pepper mills; most start out with a 3" X 3" X 12" blank and end up around 2-1/2" diameter. I've been turning at about 1,000 RPM. I was just reading the safety section in the front of the Woodturner's Catalog and they say that diameter X RPM should equal between 6000-9000. For a 3" spindle, that says my RPM should be between 2,000 and 3,000. Does that sound right?