Lathe Speed Calculator
RPM from Diameter
Calculate optimal lathe RPM from workpiece diameter
Formula
RPM = (Surface Speed x 12) / (Pi x Diameter) | Surface Speed adjusted by wood type factor
Frequently Asked Questions
How do I determine lathe speed?
Start slow and increase speed gradually. For roughing, use lower speeds. As the piece becomes round and balanced, increase to finishing speeds. Always stay within your lathe's rated capacity.
What if the workpiece is out of balance?
Start at the lowest speed and increase gradually. Out-of-balance pieces create dangerous vibration at high speeds. Rough the piece round at low speed first.
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