Hello Hood

In case you did not notice, I started a new thread regarding the arrow keys problem I have "Jogging with Arrows Keys Problem"

Anyway today I was adjusting my Y axis and I typed in the MDI screen G0 Y3.0 and the axis traveled almost the whole length of the axis. Then I typed G0 Y-3.0 and did the same thing in the opposite way.

Any idea why?
Nicolas

Only thing I can think is your steps per unit are screwed.
Hood

Obviously I never done this before but this is what I did.

My motors are from Keling, 282oz.in, 8 wires, and connected as Unipolar. The +/- of each coil is connected to the respective +/- on the driver board and the remaining 4 wires are all tie together and are connected to one of the common terminal on the driver board.

My ACME screw is precision made 1/2”-10, ten turns of the screw = 1” of table movement.

The motors are 1.8 degrees per step = 360 degrees divided by 1.8 degrees = 200 steps = 1 turn of motor shaft.

To make the machine move 1”, the screw will have to turn 10 times multiply this by 200 steps we get 2000 steps for 1” movement (Full Step)

So I have set mach for 2000 steps in the motor tuning.

If I want to set mach for Half Step, the new steps in the motor tuning will be 4000.

Perhaps I got it all wrong, is the above correct?

Thank you
Nicolas

Thats correct, as long as you have the motors direct coupled or 1:1 with a belt.
Hood

Thats correct, as long as you have the motors direct coupled or 1:1 with a belt.
Hood

I'm happy I got it right

Yes the motors are direct connected to the ACME with a coupling

Thank you for your time
Nicolas

Regarding the motors calculations which I copy from the web, there is another calculation which I don't understand and did not included above.

After we figure out the steps it says: We can now calculate the resolution level. 1" table movement divided by 2000 steps = 0.00050" of movement per step.

What is the resolution and where can I use it in mach?

Nicolas

Resolution is simply the minimum movement you can make or put another way the distance it will move with a single pulse. You have determined that when you put the Steps per unit in.
Hood

Thank you Hood
Nicolas