Program Examples:Backlash Compensation Table

Introduction

This article demonstrates the use of compensation tables for eliminating position backlash .

Program

First, attach the axis, go to an initial position (zero):

  Attach A1    
  Move A1 0

Set the backlash value and the alpha smoothing factor:

   A1.PositionBacklash = 0.5
   A1.PositionBacklashAlpha = 0.9

Checking the actual compensation value from terminal should return 0 as no motion has been done:

-->?a1.CompPCmd - a1.PCmd
0

Move back (negative direction):

  MOVE A1 -100

Checking the actual compensation value from terminal should return -0.5 as motion was in negative direction:

-->?a1.CompPCmd - a1.PCmd
-0.5

Move forward (positive direction):

  MOVE A1 +100

Checking the actual compensation value from terminal should return +0.5 as motion was in positive direction:

-->?a1.CompPCmd - a1.PCmd
0.5