[Lotus23C]

Hi
Running mach3 on a rack & pinion router. Hitting the Go to zero button sets a speed 25 - 30% higher than my rapids and at that speed I lose steps. I cannot find any setting to change it.
My rapids can be as high as 15000 mm/min but hitting the go to zero button shows 20000 mm/min and it loses steps like crazy, making 'go to zero' unusable.
I have set my rapids to 11000mm/min which gives me about 13000mm/mn velocity on go to Z.

Is there a setting to change this extra 25%?

Thanks
Patrick

[ger21]

It's probably because both X and Y are moving at the same time, which gives a velocity higher than the rapids. Neither axis is actually exceeding the rapid speed.
Try moving to your Max X position, and keep Y at zero. Goto Zero should then be at your rapid speed.

[Lotus23C]

Thanks Ger21, so you are saying the velocity reading on mach 3 is incorrect when 2 axis are running at same time? . The thing is,when individually jogged the axis don't miss steps, but they do when 2 are running at the same time as when the goto Z button is pushed. Maybe it isn't missing steps, rather there is too much demand on the power supply.

[ger21]

Thanks Ger21, so you are saying the velocity reading on mach 3 is incorrect when 2 axis are running at same time?

No, the Velocity is correct. When both the X and Y axis are moving at the same speed, at the same time, the velocity of the tool is I think 1.41x the X and Y speed,

if you were at 100,100, the move to zero is 141 units. So the velocity of the tool is the combined speed.

Maybe it isn't missing steps, rather there is too much demand on the power supply.

It's still missing steps, but the reason is different, as it's not exceeding the velocity setting.