I'm not sure why there is a limit. I assume over the period would not be
good.
From the stepper timing chart
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Stepper_Drive_Timing
it appears the TB6560 is 150,000 and is by far the worst one on that
chart, but I'm not sure that is a reasonable number. The Linistepper
Open Source RULMS1 30000 100000 4000 4000
I would think that 30,000 is a reasonable limit for step timing and
direction.
Thanks
JT
On 6/30/2021 2:37 PM, Chris Morley wrote:
Yes... what limit do you think is reasonable?
Chris
-------- Original message --------
From: John <j...@gnipsel.com>
Date: 2021-06-30 7:49 a.m. (GMT-08:00)
To: emc-developers@lists.sourceforge.net
Subject: [Emc-developers] Pncconf Step Timing Limit
Hi Chris,
Can you increase the step timing to > 12,000?
"When I was using the parallel port, the step and hold were 12000 and
3500. The software maxes this out at 10000 for the 7i92 so I used that
instead of 12000.
X axis will move, but NOT very smoothly. Y and Z do not move at all.
All 3 axis are identical, with the exception of the length of the
leadscrew (china cnc3040 machine). Same motor, same leadscrew pitch,
same wiring, etc. The motor driver is a TB6560 (not great, but works
fine for my tinkering)."
After advising the chap to edit the ini file and set the step timing
where he needed for his drives.
"Ok, I finally have 3 axis working smoothly. Editing the ini file and
playing with the step and hold times did the trick.
My apologies for being a little cranky, but I was working on it all last
week and into the weekend and was just hitting the brick wall. I had
assumed that the PncConf was showing the true max limits (step/hold) of
the card, so I didn't think there was anything else to be done."
Thanks
JT
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