John D sharing his spindle encoder speed to leadscrew stepper has me thinking, actually I have been mystified/wondering about this for a long time.
This is a question.
If I have a 8tpi (thread per inch) leadscrew and I want to thread 1" rod at 8tpi with 100 rpm at the spindle the leadscrew has to rotate 100 rpm?
What would the leadscrew rpm be at 1,000 rpm spindle speed? What would the SFM (Surface Feet per Minute) be?
I am looking at a and getting more confused.
With Tool Steel at 75 -175 SFM? that seems the leadscrew would be in the 1,000s of rpm.
You have to excuse me I am completely self taught, I flunked out of Machine Shop II 55 years ago
and have not touch a machine tool since.
There are no classes nearby and the only local machinist I know of, are those I go to their yard sales
when they are dead and the shops are being sold off.
This is why we have the forums, which I am so thankful for.
Ralph
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Clausing 8520, Craftsman 12x36 Lathe, 4x12 mini lathe, 14" Delta drill press, 40 watt laser, Consew brushless DC motors and a non working 3D printer
