
B-63943EN-1/02 11.SPINDLE SPEED FUNCTION
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11.12.1 Connection Among Spindle, Spindle Motor, and Position
Coder
As shown in the figure below a gear ratio can be inserted between the
spindle and spindle motor (n : m).
Spindle control
Spindle
amplifie
Spindle motor
Spindle
Error
counter
Gear ratio N : M
Position de
tector for Cs
(1) Gear between spindle and spindle motor
An arbitrary gear ratio may be set. However, the amount of travel of
the spindle per spindle motor revolution depends on the gear ratio. So,
the spindle command for the spindle motor needs to be adjusted
accordingly.
Set parameter Nos. 4056 to 4059.
(2) Gear between the spindle and position detector for Cs
Connect the spindle directly with the position detector for Cs without
using a gear.
(3) Interpolation type rigid tapping and machines with multiple gears
When performing interpolation type rigid tapping with a machine
using multiple gears, note the descriptions below.
If the M type gear selection method (M series only) is selected, the
CNC determines whether gears need changing using the gear change
specification mentioned in “SPINDLE SPEED CONTROL.” If the
gears need to be changed, the CNC generates the S function code read
signal SF (F007#2) and gear selection signals GR1O, GR2O, and
GR3O (F034#0-#2) to notify the PMC. Change gears using the PMC,
based on these signals.
If the T type gear selection method is selected, the CNC does not
process gear changes. When the CNC has the S function code, it
outputs signal SF and S function code signals S00 to S31
(F022#0-F025#7) to the PMC. (However, parameter No. 3705 and its
related parameters need to be set for S code and SF signal output).
Using the PMC, determine whether gears need changing, and make
the change if needed. Input gear selection signals (G028#1 and #2 for
the first spindle, G029#0 and #1 for the second spindle, G029#2 and