The marriage between Mach3 and my small CNC mill has been blossoming nicely; my last run was a 4 hour raster cut of letters into a piece of Merbau (wood).
Now, any G01 movement in X results in excessive chatter, lots of noise, no movement or erratic; and sometimes in the wrong direction.
Unless I hold down the shift key - the direction may, or may not, be reversed, but the X motor runs nice and sweet. The other axes (Y and Z) all work as normal, both in G00 or G01.
I have swapped Nema23 motors - still the same. ie, X axis
I have swapped circuit boards in the controller - still the same; X axis
I have used an earlier copy of Mach3 - installed on another hard drive - still the same.
I have re-installed Mach3 and re-configured the settings - still the same.
I have connected another computer with Mach3 - still the same.
I have changed the parallel port cable to the driver box...
Mach3 has been set to a core frequency of 25kHz. The stepping motors are set at 400 pulses, Velocity down to 1000 and accelaration has been set down to 200 units/sec/sec.
Unless I hold down the shift key, X axis is all over the place...
I have run out of ideas what to do next...
Anyone have an experience with this?