PMDX Forum

General Category => General Discussion => Topic started by: crchisholm on March 15, 2017, 06:48:15 PM

Title: WPMDX-SmartBOB-USB DEVICE ERROR: SYSTEM ERROR(7): Motion Underrun
Post by: crchisholm on March 15, 2017, 06:48:15 PM

What does this mean (above)?  I can't see anything about the job that would explaifun this. The job was running smoothly until this happened.  I was about 20 minutes into a 32 minute job

Win 7 sp 1
Mach4hobby 3233
PMDX 411
G5490
gcode from Fusion 360.

Thanks
Charlie     

Title: Re: WPMDX-SmartBOB-USB DEVICE ERROR: SYSTEM ERROR(7): Motion Underrun
Post by: crchisholm on March 15, 2017, 08:06:43 PM

G540. that is

Title: Re: WPMDX-SmartBOB-USB DEVICE ERROR: SYSTEM ERROR(7): Motion Underrun
Post by: Steve Stallings on March 15, 2017, 10:59:51 PM

If your job has lots of short moves and your computer is on the slow side,
then it is possible to consume the motion queue faster than the host can
build it at times. There may be other faults that can cause this error but
this is a good first guess.

The solution in this case is to make the motion queue larger. The PMDX
plug-in defaults to a G-code motion buffer of length 250. You can edit
this using:

Config > Plug-ins > PMDX-SmartBOB and choose the Performance Settings
tab.

A larger buffer will help prevent under-run, but will also lengthen the
response time to Feed Hold and Stop commands from the console.

Title: Re: WPMDX-SmartBOB-USB DEVICE ERROR: SYSTEM ERROR(7): Motion Underrun
Post by: crchisholm on March 16, 2017, 03:20:58 PM

I will give that a try.  There was a lot of "short moves" in that I was cutting a flourish.

Thanks