AX
Series
10
Terminology
6
5
4
3
2
1
+5″
-10″
-27″
-18″
-7″
Reference station
Example of index accuracy measurement
Index
precision
±16
0
+5″
-10″
-27″
-18″
-7″
1
2
3
4
5
6
Measured
value
Measuring
position
The ABSODEX index precision is the difference between the target
position set by an NC program and the actual stop position.
The target position is an angle (s) from the reference station
(origin return position).
As shown in the diagram on the right, the index precision is calculated
from the maximum and minimum values of the differences between
the target positions and the actual stop positions. Measurement is
expressed in terms of the width using positive and negative seconds,
as shown on the right.
A high precision encoder is used for the angular measurement.
Repeatability expresses the deviation in the angles of the stop
positions measured repeatedly under the same conditions for the
same target position. It is expressed as an angle in seconds.
Depending on the precision characteristics that the machine requires,
repeatability and index precision must be used separately.
Terminology
Index accuracy
Repeatability
* sec. A unit used to express angles (degrees, minutes, and seconds).
1 degree = 60 minutes = 3600 seconds
The out-of-roundness of the spigot side of the table installation surface.
Run out of output shaft
Face deflection
The out-of-roundness of the table installation surface.
Run out of output shaft
Surface run out of output shaft
