Fanuc Series 15i/150i-MA (Programming) Operators Manual

B-63324EN/03 PROGRAMMING 19.AXIS CONTROL FUNCTIONS
- 737 -
×
Both Kn and Kd are within the allowable range. No alarm is
output.
(b) For a millimeter machine and inch input
Command :G81.5 T1 V1.0 ;
Operation : Synchronization between the spindle and V-axis is
started at the ratio of a 1.0 inch movement (25.4
mm) along the V-axis per spindle rotation.
Pm : (Number of pulses per spindle rotation) × 1
revolution 72000 × 1
Ps : (Amount of V-axis movement) × CMR × 254 ÷ 100
10000 × 5 × 254 ÷ 100
×
××
Both Kn and Kd are within the allowable range. No alarm is
output.
(c) For a millimeter machine and inch input
Command : G81.5 T1 V0.0013 ;
Operation : Synchronization between the spindle and V-axis is
started at the ratio of a 0.0013 inch (0.03302 mm)
movement along the V-axis per spindle rotation.
Pm : (Number of pulses per spindle rotation) × 1 rotation
72000 × 1
Ps : (Amount of V-axis movement) × CMR × 254 ÷ 100
13 × 5 × 254 ÷ 100
×
××
In this case, an alarm is issued because Kd exceeds the specifiable
range.
- Based on the controlled axis configuration described in Subsec. II-19.9.1,
suppose that the spindle and V-axis are as follows:
Spindle pulse coder : 72000 pulses/rotation (4 pulses for
one A/B phase cycle)
C-axis least command increment: 0.001 degree
C-axis CMR : 1/2
V-axis least command increment: 0.001mm
V-axis CMR : 1/2
Then, the C-axis detection unit is 0.002 degree. The V-axis detection
unit is 0.002 mm. In this case, the synchronization ratio (Kn, Kd) is
related with a command as indicated below. Here, let Pm and Ps be the

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