Turning Speed for Aluminium

He simplified the formula:

For aluminum you divide the number 1200 by the diameter of the rod you are turning. That gives the RPM your piece of rod should turn to make it into a wheel.

This assumes we are working in imperial and not metric

Good point - at the scrap yard I buy my metal they separate it as they know it will not sell unless the grade is marked. I buy aircraft grade - you can look up the number and the charts will tell you if it machinable.

Kaiser Aluminum has this chart for their products: http://www.kaiseraluminum.com/customers/pr...extrusions/rod/

Another helpful page: mdmetric