On 1/28/25 11:42, Horváth Csaba wrote:
Dear All,
I have an old milling machine with a hydraulic spindle speed range
switch. The hydraulic valve has 2 coils (low and high speed). There
are 2 feedback inductive sensors (for low and high speed).
How can I solve this so that when a program needs to change the speed
range, it does so automatically under the following conditions.
- the spindle can only rotate (in the between min-max range
(50-3200rpm) if the inductive feedback corresponding to the speed
- the range can be changed by reducing the speed to 1-2 rpm
- low range (50-1500rpm)
- high range (1501-3200rpm)
I am looking for advice on how I can solve this properly. (I have
never done this with Linuxcnc before)
This is a bit of a conundrum, one I solved with a mux4 and tally
switches on the hand gearshift knob of my GO704. If neither tally is
true, the spindle is then sent about a 10 rpm speed so the gears are
slowly moving and can engage the next position w/o any excitement. I can
reach up and change gears at any speed as the PID slows the spindle to
a non-damagining crawl in a few dozen milliseonds, long before the
gears are disengaged and normal speed is restored when the gears are 95%
engaged in the other gear. hal is quite capable of such a task. I use
the same basic mechanism to correct the spindle tach. So the displayed
value derived from motor rpms, not spindle. is properly scaled to a
0-1500 or 0-3000 range. Some of this also changes the ini file. If
desired I can pm those files for study.
Best regards,
Csaba
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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