Running it like that should make it possible to cut teeth on thread taps with
relief. Thread it 'lumpy', mill out most of the chip grooves, harden then grind
to sharpen. Used to be mechanical drive attachments for some lathes to move the
cross slide in and out for cutting threads for taps.
On Monday, July 13, 2020, 11:59:28 AM MDT, Chris Albertson
<[email protected]> wrote:
Actually making a hex head on the lathe would best be done using a
microcontroller. FPGAs can compute trig functions but I think the method
used is to first implement a "soft CPU" and then run code written in C that
uses math.h That is a silly-expensive why to replace a $5 STM32 chip.
But really, the Lathe spindle does not run so fast and you can write this
code as a HAL component that runs in the Servo loop. I wanted out how I
would do this last night and was stumped on the math until I remembered the
law of cosines and "SAS" triangle problems from some class I took in the
10th grade. Look those up on Wikipedia and then it is not hard to
computer the cross slide position as a function of spindle angle.
The hard part is getting such a good cross slide setup with no play of
backlash
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