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Is there a chart or formula for sanding speeds vs project diameter?
I am trying to break some of my bad habits, and start turning more safely, and using methods/techniques that are more consistent and reliable to get consistent results, and faster completion of projects. I have lots of bad habits to break. Craft Supplies USA publishes a chart of minimum and maximum lathe speeds for turning.
Formula: Diameter x RPM = 6,000-9,000
Example- A bowl blank that is 8 inches in diameter.
8" x 750 RPM = 6,000
8" x 1125 RPM = 9,000
Therefore the slowest recommended spindle speed is 750 RPM, with the highest recommended speed being 1125 RPM.
This makes setting a safe spindle speed easy.
We all know that to make sanding more efficient we need to slow down the lathe. Does anybody have a similar chart or formula for the best speeds for sanding, depending on the diameter of the piece? I have heard all kinds of guesstimated speed like turn at 1/2 turning speed for sanding, etc. A lot of people seem to have a rule of thumb, but few agree. When sanding a bowl or vessel, the max speed would vary depending on how close you are sanding to the center vs the outside of the piece, but speeding up to compensate for the slower turning center is a little over the top in terms of practicality. Does the sanding speed chart below seem to be reasonable, or do you have a better formula/method to determine speed, or you do what I have done in the past, and just wing it.?
Attachment 516596