Syntec 22/220 Series User Manual

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Backlash Compensation–43
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Method 3: Use dial indicator to measure backlash value
Step (1) Preparedial indicatorand fix it on the machine where does not move with axis.
Step (2) Switch to MPGMode, move the axis with positive direction to touchindicator's probe
until dial reaches aspecific number. Notice not to move to negative direction after touching
the indicator to avoid backlash effect. (Assume the indicator is at 50)
Step (3) Record the machine coordinate X, i.e. 100.000, then use MPG to move in negative
direction, and stop until indicator number reduces 1 (dial indicator should be at 49 at that
time)
Step (4) Record the machine coordinate Y, i.e. 99.985, and the backlash value is equal to X
subtracted by Y and distance of 1 in dial indicator. As a result, the backlash value is X-Y-1=14
um.
The steps above is a basic example, measurements under same concept can have different
procedures.
Step4: Enter the backlash value into Pr1241~.
Step5:Repeat similar measurement to verify the effect of compensation.
The steps above are examples of Linear Way backlash. For Box Way backlash, the measurement is similar but
has two major differences:
Use dial indicator to measure the "excess distance (assume Q)" under G00 speed
The value of Pr1241~ for Linear Way backlash (assume P) should be entered to Pr1261~ for Box Way
cases; and enter Pr1641~ with value of (P-2Q).
9.5 Application Example
Pr1241 = 10(B), Pr1261 = 20(A)
Box way compensation:
G00: If the moving andHome Searchingdirections are the same ,the compensation value
is0.5*(A-B)=5; when it is opposite,the compensation is0.5*(A+B)=15
G01: When Moving and Home Searching directions are opposite, the compensation is 20.
Linear way compensation: When Moving and Home Searching directions are opposite, the
compensation is 10.
Assume the Home Searching direction is positive.
Execute the program below
G90 G01 X0. F500  //G01 position
M0
G00 X10.  //G00 positive direction
M0
G01 X20.  //G01 positive direction
M0
G00 X10.  //G00opposite direction
M0
G01 X0.  //G01opposite direction
M30
When executing backlash compensation, the equation holds: absolute position command =machine
coordinate + backlash value, and use System Data 40~ (command value) and System Data 72~ (machine
coordinate) to observe the compensation situation.
Linear Way Compensation (Assuming just finished Home Searching)

Syntec 22/220 Series Specifications

General

Brand	Syntec
Model	22/220 Series
Category	Controller
Language	English