Why certainly Gene (see attached). I actually have it working a little better now. My spindle-at-speed LED will start going bonkers around 1200 rpm. I'm guessing this is when the counter "throws up it's hands and says - I quit!" lol. The spindle will operate all the way to around 4700 rpm but anything above this and the MC-2100 shuts it down -- must be some kind of voltage limiter kicking in then.
On Thu, May 7, 2020 at 2:29 PM Gene Heskett <ghesk...@shentel.net> wrote: > On Thursday 07 May 2020 13:19:23 Dan Henderson wrote: > > > I believe this is open loop. Isn’t PID only used in closed loop > > control? > > > Its (the PID is) a waste of processor time if open loop. I don't use one > of those in any spindle run by a vfd, the vfd is generally stiff enough > control by itself. If I thread on that machine, it will have a spindle > encoder, but its only job is to glue the axis motion being driven to cut > the thread, to the spindle rotation, in the case of a g33.1, going both > in and out of the hole. If you aren't useing a PID for the spindle, that > leaves motion I think. > > I think its time we saw your .hal file. Can you insert it into a mail? > > > On Thu, May 7, 2020 at 11:03 AM Gene Heskett <ghesk...@shentel.net> > wrote: > > > On Thursday 07 May 2020 11:27:57 Jon Elson wrote: > > > > On 05/06/2020 09:20 PM, Dan Henderson wrote: > > > > > I’ve confirmed the fluctuation occurs when spindle-at-speed is > > > > > configured. When I remove this feature, the spindle rpm appears > > > > > to stabilize. It’s almost like it gets caught in a loop trying > > > > > to chase its tail. > > > > > > > > This is VERY common in servo systems, and is due to delay in > > > > response of the object being controlled. > > > > You need to slow down the response of the PID to ignore the > > > > delay. This may be possible by adding > > > > D to it. > > > > > > > > Jon > > > > > > But my msg was that a near module generated spindle.N.at-speed was > > > never to be injected into any signal path leading back to a PID. > > > That near's output s/b only to that input to motion, and possibly to > > > an indicator led in the gui so the operator can be advised if its > > > acting funkity. Flickering could be worn brushes in a brushed PMDC > > > motor for instance. > > > > > > What you are describing as delays can often be fixed by the proper > > > re-ordering of the addf's involved for the oscillating axis. That > > > aspect of configuring LinuxCNC hasn't been mentioned recently or I > > > wouldn't even have included that paragraph in my reply. > > > > > > And from Dan's description above, I think this is an entirely > > > different critter from a timeing delay. > > > > > > Cheers Jon & stay well, Gene Heskett > > > -- > > > "There are four boxes to be used in defense of liberty: > > > soap, ballot, jury, and ammo. Please use in that order." > > > -Ed Howdershelt (Author) > > > If we desire respect for the law, we must first make the law > > > respectable. - Louis D. Brandeis > > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users >
my-mill.hal
Description: Binary data
custom_postgui.hal
Description: Binary data
<?xml version='1.0' encoding='UTF-8'?>
<pyvcp>
<vbox>
<relief>RIDGE</relief>
<bd>6</bd>
<label>
<text>"Spindle Speed:"</text>
<font>("Helvetica",20)</font>
</label>
<bar>
<halpin>"spindle-speed"</halpin>
<max_>3000</max_>
</bar>
<label>
<text>"Spindle-At-Speed:"</text>
<font>("Helvetica",20)</font>
</label>
<hbox>
<label>
<text>" "</text>
<font>("Helvetica",20)</font>
</label>
<led>
<halpin>"spindle-at-speed-led"</halpin>
<size>30</size>
<on_color>"green"</on_color>
<off_color>"red"</off_color>
</led>
</hbox>
</vbox>
</pyvcp>
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