开云体育

"Ralph Hulslander said
John Dammeyer's original ELS accepted one pulse per rev and still does
accurate threads and turnings."

Yes maybe it does but that has nothing to do with your original question
which discussed putting the encoder on the motor instead of the spindle.
If you have a Low/High gear your counts per revolution of the spindle
will change with the gear change. If you have a gear ratio between motor
and spindle this needs to be taken into account. These parameters are
"embedded" in the software and not modifiable at run time.

John Dammeyer's ELS is an excellent bit of kit but it still has
problems. I built and ran the system for a few years and therefore have
a little knowledge. If everything is perfect one pulse per rev works
well, however we do not live in a perfect world. If the spindle slows
slightly during a cut the tool is still being controlled at the original
rate therefore the cut load will increase. If cutting a thread with a
large pitch that can cause problems. When I had the system after having
problems I overcame them by using "Spreadsheet CNC" to cut deep threads,
typically when making a worm or a Hob in Silver Steel (Drill Rod).
Since fitting the Russian ELS I have had less problems to the extent
that I can alter my spindle speed during a cut with no problems and even
a stall does not result in a broken tool. (VFD on 750watt motor but the
drive belt tends to slip sometimes).
The JD ELS also still has problems with cutting internal tapers, but
that is a different subject.

Richard