On 07/17/2019 03:51 PM, John Dammeyer wrote:
There are a number of videos out there changing up the G0704 gear driven
spindle to belt drive. Some use toothed belts, others a double set of pulleys.
Most of the videos explain that they will soon but the slotted RPM sensor disk
back on but for most of them they've not done that yet.
For LinuxCNC what sort of encoder resolution is required on the spindle to be
able to do tapping. I know I can do it with one pulse per rev with my
Electronic Lead Screw to cut nice threads but I also don't slow down the
spindle at the end of a tap into a blind hole while tracking spindle speed.
Well, if you are using a software encoder counter, you have
to limit the encoder count * RPM to what that counter can
follow. If using a hardware encoder counter, then that is
not a limitation.
On my Bridgeport, I am using the 81-tooth bull gear to
create an encoder, so that gives 324 quadrature counts/rev.
That has worked very well.
Jon
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