On Wed, 25 Oct 2023, Todd Zuercher wrote:
Date: Wed, 25 Oct 2023 15:15:36 +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: Re: [Emc-users] Mesa Step Pulses?
Peter,
Thanks, But is it even going to be worth the effort? Since I'm sure the
regular minimum pulse length signal is still going to at least work albeit
with some possible theoretical performance limitations. I may not even
require step rates beyond where this is a non-issue?
Well since you can certainly get near square waves at the maximum speed
with the current setup, it doesnt seem that much is gained by always having
square wave step signals, since the minimum timings are always met.
That said, there is an advantage of square wave outputs in simplifying
setup (since the step length and step space settings are unnecessary)
I've asked the drive manufacturer. See if they get back to me.
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
-----Original Message-----
From: Peter Wallace <p...@mesanet.com>
Sent: Wednesday, October 25, 2023 10:36 AM
To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Mesa Step Pulses?
[EXTERNAL EMAIL] Be sure links are safe.
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.<https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2F
http://www.pgrahamdunn.com/%2Findex.php&data=05%7C01%7Ctoddz%40pgrahamdunn.com
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ta=Zwbdv69ESSXKwXR%2FvXYbyijq1wOtyar%2FYeCMJAr6fgg%3D&reserved=0>
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
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Mesa Electronics
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Peter Wallace
Mesa Electronics
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