FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
B–62764EN/01
14. FUNCTIONS TO SIMPLIFY
PROGRAMMING
249
By specifying indexing positions (angles) for the indexing axis (one
rotation axis, A, B, or C), the index table of the machining center can be
indexed.
Before and after indexing, the index table is automatically unclamped or
clamped .
Specify an indexing position with address A, B, or C (set to bit 0 of
parameter ROT
x
No.1006).
The indexing position is specified by either of the following (depending
on bit 4 of parameter G90 No.5500):
1. Absolute value only
2. Absolute or incremental value depending on the specified G code:
G90 or G91
A positive value indicates an indexing position in the counterclockwise
direction. A negative value indicates an indexing position in the
clockwise direction.
The minimum indexing angle of the index table is the value set to
parameter 5512. Only multiples of the least input increment can be
specified as the indexing angle. If any value that is not a multiple is
specified, an P/S alarm (No. 135) occurs. Decimal fractions can also be
entered. When a decimal fraction is entered, the 1’s digit corresponds to
degree units.
0°
–45°
+60°
G90 B–45.0 ; or
G91 B–105.0;
A
Value specified for rotation from A to B
(case 2 described above)
B
The direction of rotation and angular displacement are determined by
either of the following two methods. Refer to the manual written by the
machine tool builder to find out which method is applied.
1. Using the miscellaneous function specified in parameter No. 5511
(Address) (Indexing position) (Miscellaneous function);
Rotation in the negative direction
(Address) (Indexing position);
Rotation in the positive direction (No miscellaneous functions are
specified.)
An angular displacement greater than 360
°is rounded down to the
corresponding angular displacement within 360
°when bit 2 of
parameter ABS No. 5500 specifies this option.
For example, when G90 B400.0 (miscellaneous function); is specified
at a position of 0 , the table is rotated by 40
°in the negative direction.
14.11
INDEX TABLE
INDEXING FUNCTION
Explanations
D Indexing position
D Direction and value of
rotation

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