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CA/CB Head Setup

An-102a, Copyright © by Gil Hagiz
Last updated Mar-02-2006
For version 6.11 and later


This application note describes the setup of a CA/CB rotary head for 5-axis TCP machining.
The RTCP capability is provided by a separate BIN file. Without this file the machine can work as a regular 5-axis non TCP machine.



This set up can be performed by a superuser only.
To avoid unintentional set up, the superuser has to change the security level in plc@50 to 0.
In MDI type: @50=0
Line numbers for setup data relate to the machine.cnx file, in the machine data area after line n30000.
Before you start:

Setup general

To set the machine zero for an axis proceed as follows (C is used as an example):


Setup A/B-Axis

A/B=0 is when the tool is vertical, in the minus-Z direction, same as in a three-axis machine.
For CA, A=90 is when C=0 and A is in the direction of plus-Y.
For CB, B=90 is when C=0 and B is in the direction of minus-X.
To set A/B proceed as follows:

Setup C-Axis

C=0 is when:
For CA: A turns about X-axis and A90 is the plus-Y direction.
For CB: B turns about Y-axis and B90 is the minus-X direction.
To set C proceed as follows:


X and Y offsets can compensate for misalignment between the spindle axis and the C-axis.
XY offsets are measured from the spindle to the center of C-axis.
For example, if offset x1 is entered then the machine will be at x1 when the tool is at x0.



Tool Length

Tool length is measured from A/B-pivot, however, tools can be measured from a more convenient place, like the spindle face.
To measure the Z-pivot length:

Final test