On Wed, 25 Oct 2023, Todd Zuercher wrote:
Date: Wed, 25 Oct 2023 12:22:40 +0000
From: Todd Zuercher <to...@pgrahamdunn.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: [Emc-users] Mesa Step Pulses?
Hello,
It is my understanding that the step pulses generated by Mesa cards are
always the minimum pulse length set by for example
hm2_5i25.0.stepgen.00.steplen, only the space between the pulses is varied
by the step rate, is that correct?
I was reading the manual for the new drive I was planning to use in my next
build and see that the drive calls a preference of a 50% duty cycle for step
pulse inputs. I am guessing that it may have something to do with how the
drive's pulse filtering system works, such that for maximum noise filtering
and step reliability having the pulse length be approximately equal to the
step spacing gives the best results.
So my questions are; Would it be possible to make a Mesa card output a 50%
duty cycle step pattern instead of the current default pattern? And would
doing this even be worth the effort?
Its possible with a minor firmware change and LinuxCNC driver
change to enable the mode.
Todd Zuercher
P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php>
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
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Peter Wallace
Mesa Electronics
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