Olivier:
Actually, this question revolved around my Bridgeport mill. In this
case I'd like to get "feedback" to MACH2 and to a readout of RPM, but
I don't think the number is as critical as in a lathe. I just
thought it made sense to use the pulses from the VFD to drive the
readout. An error of a percent or two probably wouldn't matter for
this application. It's just that the number of pulses would have to
be able to be scaled to make the read out make sense in RPM. Is
there a way to scale in MACH2 between the pulses and the RPM?
Jeff
--- In mach1mach2cnc@..., "Digital audio Pro"
<digitalaudiopro@w...> wrote:
Not enough precision for threading. Even if you could do a PWM to
pulse
convertor it will not work. You will need a true encoder, home made
or not.
More, it will be simpler.
For threading you don't only need the exact speed of the spindle,
but his
absolute position too with a good accuracy. Can only be done with
an encoder
with index + eventually other pulses for low or medium speed
applications.
Olivier.
