Quote:
|
How would I convert miles per hour to rpm so I could convert that to feet per minute?
|
A couple of formulas would work, but a lookup chart would probably be more helpful.
C = 2 times PI times Radius
5280 / circumference gives Revolutions required to equal a mile.
Correction: did the math wrong.
For a piece of stock 6 inches diameter, radius is 3 inches, pi is 3.14 (close enough for this work), so 2 * 3 * 3.14 gives 18.84 inches. (5280 X 12) divided by 18.84 gives about 3500 Revolutions to equal 1 mile. Your lathe spinning stock 6 inches in diameter at 3250 RPM is doing nearly 1 mile a minute. That's not bad for a cantankerous geriatric junkyard reject.
