FANUC Series 16i /18i /21i Additional Manual Page 2
Additional Manual
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FANUC Series16i/18i/21i–MB, 18i–MB5
Improvement of AI contour control
/ AI nano contour control
040322
A-79490E
1. Specification
During AI contour control / AI nano contour control mode, when a command of rotation axis is specified in
inch input, the time constant of acceleration/deceleration becomes 25.4 times compared with that at millimeter
input.
By this improvement, when the parameter AIH (No.7057#1) is set to “1”, the time constant of acceleration
/deceleration at inch input becomes the same as that at millimeter input.
CNC controls so that the total feedrate, which is calculated from the each axis feedrate, is changed with a
constant acceleration/deceleration ratio at the acceleration/deceleration before interpolation. When CNC
calculates the total feedrate, the each axis feedrate is calculated with the unit of F command. That is, CNC
assumes that 1 mm/min and 1 deg/min are the same at millimeter input and that 1 inch/min and 1 deg/min are
the same at inch input. And when using inch/metric conversion, CNC decides so that the
acceleration/deceleration becomes the same at inch input and millimeter input. Therefore, the time constant of
rotation axis at inch input becomes long as follows.
Time constant of acceleration/deceleration before interpolation
Target feedrate (parameter No.1770) = 10000 mm/min
Time constant (parameter No.1771) = 800 msec
l At millimeter input --- Acceleration ratio = F10000 / 800msec
l At inch input --- Acceleration ratio = F394(=10000mm/min) / 800msec
Linear axis
800msec
F10000
(=10000mm/min)
Rotation axis
800msec
F10000
(=10000deg/min)
Linear axis
800msec
F394
(=10000mm/min)
Rotation axis
800msec
F10000
(=10000deg/min)
Acceleration ratio
= F394 / 800msec
F394
Contents Summary of FANUC Series 16i /18i /21i Additional Manual
- Page 1FANUC Series 16i /18i /21i – MB FANUC Series 18i – MB5 Improvement of AI contour control / AI nano contour control ( Feedrate control at inch input / mm output ) Specifications Index 1. Specification.....................................................................................................
- Page 21. Specification During AI contour control / AI nano contour control mode, when a command of rotation axis is specified in inch input, the time constant of acceleration/deceleration becomes 25.4 times compared with that at millimeter input. By this improvement, when the parameter AIH (No.7057#1) is
- Page 3When parameter AIH (No.7057#1) is set to “1”with inch input and millimeter output during AI contour control / AI nano contour control mode, CNC does the following inch/metric conversion before executing the acceleration/deceleration before interpolation. By this method, CNC controls the acceleration