Need Help!- different lead on x and y

[Claude Boudreau]

How is mach 3 handling 2 different lead on x and y axis?
I m thinking of increasing my table size and might end up with 2 differents screws for a while.
One is acme 10 tpi single start , the other will be a metric ballscrew 5mm per turn . Witch should double my speed on that axis.
If I remember correctly Mach 3 can handle this , is this going to give me problems like oval round?

[dertsap]

won't be a problem , once you've got your steps setup in motor tuning then you'll be rockin

[Claude Boudreau]

Can you use metric on one axis and inches on the other?
what will happen to your feed rate if one axis is say 25 ipm (10tpi@250rpm)
and the other, 125 cm per min, or 49.2 imp (.5cm lead@250rpm)

So in the motor tunning can one axis be mm the other inches? or do you have to put the equivalent and use the same system?

[garagefela]

Originally Posted by Claude Boudreau Can you use metric on one axis and inches on the other? what will happen to your feed rate if one axis is say 25 ipm (10tpi@250rpm) and the other, 125 cm per min, or 49.2 imp (.5cm lead@250rpm) So in the motor tuning can one axis be mm the other inches? or do you have to put the equivalent and use the same system?

Keep it all the same, either metric or imperial and just convert the amount.

The control could not care less about what pitch screw that you use as long as it knows how many steps it will take to move a certain distance.

Regards

[ger21]

You can't mix units during setup. It has to be either inches or mm. But different screws don't matter, just convert to whatever the native units are.

[Claude Boudreau]

Thanks everyone,

One last thing, with my xylotec driver and 425oz in stepper my top motor speed is approx. 250rpm , so I should get around 50 inches minute with my new screws on x and y axis (5mm lead) and a bit higher on z with a 8mm lead. So my feedrate should be ok at 50.



For argument purpose, let say my z axis had a much slower travel than x and y would my feedrate be limited to the lower speed axis?

Would it lower the speed of the other axis when they move all together, and regain top feedrate when z is not moving?

[ger21]

For argument purpose, let say my z axis had a much slower travel than x and y would my feedrate be limited to the lower speed axis? Would it lower the speed of the other axis when they move all together, and regain top feedrate when z is not moving?

It really depends on the direction your moving. Mach will try to move at the commanded feedrate, but if that involves your slow axis, and that axis limits the speed, then it'll go as fast as that axis allows. Does that make sense?

Say your Z moves 10ipm, but your X50ipm. If you go from X0 Y0 Z2 to X50 Y0 Z0, at a feedrate of 50 ipm, then it'll move at 50 ipm.

[Claude Boudreau]

Originally Posted by ger21 It really depends on the direction your moving. Mach will try to move at the commanded feedrate, but if that involves your slow axis, and that axis limits the speed, then it'll go as fast as that axis allows. Does that make sense? Say your Z moves 10ipm, but your X50ipm. If you go from X0 Y0 Z2 to X50 Y0 Z0, at a feedrate of 50 ipm, then it'll move at 50 ipm.

I see , moving 50 on Xaxis is gonna take a minute, so if your move on Z is more than 10 it will start slowing down your feedrate. Make sense...thanks