HF 8x12 Lathe - Lead Screw specs

gorlosky

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I have a HF 8x12 Lathe and I am trying to figure out the Lead Screw specs. It appears to be 20 mm and 12 TPI, but since the threads are flat on top, not sure what the true OD would be, and there is no 20 mm 12 TPI tap ?
 
ah ha - so this flat peak and valley ACME thread must have a tap that is 12 Threads per Inch, but I can not find one even close to about 7/8 to 1 inch diameter.
Any more thoughts ?

Half Nuts.jpg
 
Last edited:
Well I guess these are not a normal ACME tap thread, but Robert Bertrand at LATHEMASTER METALWORKING TOOLS had them - lucky me.
 
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