I am running 3 A3977 driver boards, 1 of which is acting funny. The direction seems to change randomly.
I have switched the cards around to isolate the problem, and it seems to be the card itself. I had the machine running somewhat smoothly, and it seems to have come about recently.
If I am jogging the z-axis up/down, it will run for about 1-2", and then change direction. If I continue to run the axis, it may run for a little while in that direction, and then change.
I am running Mach3, and have changed out the resistor values specified on PMinMO's website. I have the pulse set to 5uS, as required as well. All the other axis seem to be working fine (electrically). I am not sure what it could be, since it doesn't seem to stall, just change direction.
Any suggestions?