It looks as if you may be having a problem with the direction line and pulses. Instead of ;losing pulese you are always getting an extra pulse to the left. In other words the tool is always shifting in the same direction. This is a oribklem that others have had with timong of the Step signal along with the direction change pin. I am not expalaining this very well but it has been discussed quite a bit. To check you need to set up a reference poiont on one axies then write Gcode to move off the reference say 3 inches and then move back. Repeat this as 100 times. Or you can start with 10 and move up from there. See if you are losing reference in the same direction on every change in direction. Actually it is usually just on one change either when direction goes positive or when it goes negative. If it only happens under load then it is probablly lost steps. If it is timing them it will probablly show up even when cutting air.
Garry
PS
The curve on the sides of the piece makes some sense but the sloped line on th top would seem to have to be from the piece moving or bad Gcode as the maching has to be cutting a diagional on the last pass and I can't think of a driver issue that could cause that.  |