Hi
We ran the machine with both backlash on and off to see if there was any difference but unfortunately no change, so we have left it turned off.
We have the acceleration set at 500mm per/sec and this is about where we can safely run the machine without the shudders getting too violent, so if we take the acceleration up much more than that we end up with extreme jolts inbetween each line of code.
We ran a test just doing g1 moves as suggested, and the lines ran smoothly with no slowdown inbetween each line on both the x and y axis thought we would try g2 moves
e.g. G2x50y100
G2x100y200
G2x200y300
G2x300y50
and as soon as both axis moved simultaneously the shudders and acceleration and deceleration reappeared and the feedrate fluctuated from 0 up to max feedrate between each 'g2' move.
Thanks
Shelley