measure displacement in "mm"

[Clecio]

Dear:

I need to development a system to mesure a displacement of a axis in mm. Let me expain: I'm control a servo system Festo with a PXI-7350 + UMI-7772. Through the analog output, we control the velocity of the motor. The UMI receive the signal of the encoder and through of him, I think to do the measure. Do you have some idea how to do this?

Thank you.

Clécio.

[AnalogKid2DigitalMan]

If you poll the encoder reading before and after the move and know how much 1 count is in displacement then just do the math. This assumes no slippage or slop in the motion mechanics. Distance = (# counts moved) * (displacement/count)

[Giridhar_Rajan]

Hi,

Are you using a ball screw arrangement to move slides. In that case,

Displacement in mm = (counts read / pitch) * encoder counts per revolution

Remember that we set encoder counts in quadrature.

Regards,

Giridhar Rajan

Automation Engineer

Cruiser Controls

Mumbai, India

[Giridhar_Rajan]

Sorry the above formula is a bit wrong, the correct one is below,

displacement in mm = (pitch / encoder counts per revolution) * counts read

Regards,

Giridhar Rajan

Automation Engineer

Cruiser Controls

Mumbai, India