Leslie Newell wrote: > Thanks for the responses. > > >> In the upcoming EMC 2.3 there is a "spindle at speed" HAL input, so >> EMC will pause motion to let the spindle speed up or slow down before >> starting a feed, if in CSS mode >> > > So what happens with this signal if you are using CSS when facing? In > that case the spindle speed is changing with the cut diameter. > > Is there any timetable for diameter mode or is it a case of finding a > volunteer? > > If you just want diameter readout, what would happen if you changed the INPUT_SCALE to be half the value? Obviously, both the commands and the display would give the right scale in diameter units. Would it adversely affect something else, like tool offsets? Obviously, if you entered a circular move in the XZ plane with a G02 or G03, it would actually move in an ellipse. > I am contemplating using EMC on my next lathe retrofit. Mach will do > most of what I want but currently it is pretty hopeless when it comes to > threading. The anticipated setup is: > 0.75kW brushless motors for X and Z - not sure if I'll use s/d or analog > control yet. It depends if I can re-use the existing Fanuc drives. > 7.5kW inverter spindle, driven with an anlog output > 2x electronic handwheel (high res MPGs) > high resolution spindle encoder. > Touch screen. > All of this is done and ready for immediate use. > Analog inputs (modified joystick) for FRO + spindle override. Is there > an option for separate rapid speed override? > First part doesn't sound too hard, but I haven't heard of anyone using the joystick inputs like that with EMC. The way the analog joystick works on most PCs requires timing loops, which is sort of messy on a real time system. You might look into USB joysticks, but again, I don't know anyone that has done this. > Front/rear tool posts - Can EMC handle a rear tool post without using > negative coordinates for the rear post? > No. Using them together sounds a bit tricky. The X axis is a continuum, and you want to have the sign flip over when you switch to a different tool. I suppose there probably is a way to do this, though. It would require something between EMC and the servo axis to flip the direction. HAL could cetainly do that, but getting it to move smoothly when you change the sign and offset would take some care. Also, making sure everything was in a safe position when you switch over would need to be addressed.
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