Locate an old book on "Gunsmithing" or "Rifle making" and check on the part about "Gain Twist" as this is the method of doing it inside a rifle barrel and the same method, I suppose, could be used to do it to the exterior of a rod. Al Messer --- peter.chadwick@xxxxxxxxxxx wrote: > Any ideas on how to cut a variable pitch spiral on a > round rod? > (Variable picth lead screw is NOT the answer I'm > looking for!) > > Peter Chadwick > > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email > to, > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject line. > _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.