Found this on a sunnan site today regarding their rigid hone.
[QUOTE]Optimum RPM is calculated by dividing 1200 by
the bore diameter in inches... for example: 1200 ÷ 6 inches = 200 RPM;
or dividing 30,000 by the bore diameter in millimeters... for example
30,000 ÷ 150 millimeters = 200 RPM.
If the power source is a drill press or other rigid stroking device, make
sure your portable hone is equipped with two universal joints to provide
full floating action at the honing head.[/QUOTE]
