One other thing, I would also suggest you disable Idle current reduction
on your controller board if that is an option. I was on the HCNC list for
quite some time and many people had strange issues when idle current
reduction was enabled, apparently the driver chips also have that feature
built in and the two different implementations don't play well together.
On Mon, Jul 6, 2009 at 8:21 AM, Damian Slavek damia...@gmail.com wrote:
I would suggest checking this page:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Stepper_Drive_Timing
It only has the HCNC pro listed but I believe they use the same driver
chips.
I have the HCNC Pro and have not seen the issues you mention, although like
Terry already mentioned, stepconf uses inches per second, not inches per
minute. That was my only gotcha when setting up.
On Sun, Jul 5, 2009 at 2:25 PM, Jeffrey Pease jpe...@peasej.com wrote:
I am working on tuning my homebuilt HobbyCNC machine with EMC 2.3. I
am using the HobbyCNC EZ driver board to interface with my PC. I have
things working, but am working on tweaking the ini settings to get as
high of feedrate as I can reliably.
One mysterious issue I've seen that I'm trying to figure out is that
very, very rarely, a movement command to the milling machine will make
an axis move the correct distance in the INCORRECT direction. This can
happen either when running a gcode program or manually jogging the
axis in a direction. If it occurs during a jog, usually all I have to
do to fix it is stop jogging and then start again.
The computer interfaces with the driver board using the normal STEP,
DIRECTION signals for each axis over the parallel port.
The question is, where do you think this issue is being introduced? It
seems unlikely that EMC2 could be getting the direction wrong in
isolated cases, but, to me, it seems equally unlikely that the driver
board is driving a particular direction incorrectly in isolated cases.
This might also be a symptom of operating at too high of a feedrate
(in the current case I have been trying to make 40 inches per second
work), but I'm hoping to hear from someone who has seen and fixed this
issue before I try dropping the feedrate. Like I say, this issue crops
maybe .05% of the time - very rare, but enough to affect the overall
reliability of my machine.
Any ideas?
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