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Quick Navigation Tormach Personal CNC Mill Top No I didn’t heat treat the tap since it was used to make soft Turcite-X & Turcite-A antibacklash nuts such as the ones shown here: Since the tap was machined from O-1 drill rod it could have been heat treated. I suppose an ACME thread form could have been made on a similar double start thread by using a fine pitch insert such as a Vardex 3ER16ACME on threading a double start 8tpi ACME leadscrew.
Here is a picture of my threading setup: Note the follow rest for the 5/16" diameter rod. I selected double start 11tpi with my 8tpi lead screw lathe because then I could close the half-nut on odd/even numbers of the threading dial for the separate thread starts. How did you go about making it? Is it heat treated?Made it on my manual 12x36 lathe using a Vardex 3ER20UN insert. Don wrote:"Although not ACME I made my own double start 5/16-11 tap for tapping Turcite "
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