I recently started getting this crippling "motion under run" error. I have actually had a lot of problems which may or may not be related. But lets take them one at a time.
This motion underrun error happens as soon as I start using the machine during jogging the machine.
The sequence is very repeatable.
1. start up Mach 4
2. home all axis
3. referencing completes without a problem
4. start jogging the machine. The first jog direction works no matter which one I pick. Second one is iffy... but if I go x+ then x- or y+ y- etc it stops and gives the error.
Slowing down the jogging rate has no effect even at 1%
Therefore I can't get to the point I can set a work offset and start milling.
I attached the debug log per the instructions in the FAQ.
my setup
Windows 10 Pro 64bit. All the specs match Mach 4 requirements.
PMDX 424
Other issues that have persisted since I first installed the PMDX 424. These may or may not help resolve the upper more urgent issue.
1. When I close Mach 4 by clicking the x in the corner, the window goes away but the app continues to run in the background. I usually find out when I go to open the app again and it says "Mach 4 is already running". I have to open the task manager and force close Mach 4. This happens about 7 out of 10 times when I close the app. Its pretty annoying. I have begun to close Mach 4 then immediately open the task manager and "close" it again.
2. I frequently get this error PMDX: "No synchronized position from motion planner". If I click enable several times it goes away. Again I have a work around but it really sucks that is keeps happening.
3. Another less frequent but regular error says Mach 4 can't communicate with the device. I have to close everything and disconnect the PMDX 424 and reconnect it. It starts working again.
Again the first issue is the most important as I have parts I can't run until we figure this out.