
B-63943EN-1/02 11.SPINDLE SPEED FUNCTION
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The table below indicates the spindle speed range of each gear in rigid
tapping.
Spindle speed range (during rigid tapping)
Gear
Lower limit Upper limit
Low-
speed
gear
1 revolution
Maximum low-speed gear speed
Basic spindle motor speed + α
=
Low-speed gear ratio
Medium
speed
gear
Maximum
low-speed gear
speed + 1 revolution
Maximum medium-speed gear speed
Basic spindle motor speed + α
=
Medium-speed gear ratio
High-
speed
gear
Maximum
medium-speed gear
speed + 1 revolution
Maximum high-speed gear speed
Basic spindle motor speed + α
=
High-speed gear ratio
NOTE
This table show an example of three gears. For the
basic spindle motor speed, refer to the spindle motor
description manual. "+α" means that the spindle
motor speed may slightly exceed the basic spindle
motor speed.
If the M type gear selection method (M series only) is used, use gear
change method B (bit 3 (SGT) of parameter No. 3705 = 1) in the
tapping cycle to specify the following:
The table above shows the maximum low-speed gear speed during
rigid tapping for low-/medium-speed gear change position D
(parameter No. 3761).
The table above shows the maximum medium-speed gear speed
during rigid tapping for medium-/high-speed gear change position E
(parameter No. 3762).
If the T type gear selection method is used, add the rigid tapping logic
to the logic programmed in the PMC.
See "SPINDLE SPEED CONTROL" for details of the spindle gear
change specifications.
A loop gain can be set for each gear. Set the loop gain of each gear in
parameter Nos. 5281 to 5284, and set a loop gain multiplier in
parameter Nos. 5291 to 5294. Specify the time constant and the
maximum spindle speed for each gear.
Use parameters Nos. 5261 to 5264 to specify the time constant.
Use parameters Nos. 5241 to 5244 to specify the maximum spindle
speed.
For M type gear selection method, set the maximum spindle speed to
parameter No. 5243, irrespective of the number of gear stages used.
Setting bit 2 (TDR) of parameter No. 5201 to "1" enables setting of
the time constants used during extraction for each gear set.
Specify the extraction time constant for each gear in parameter Nos.
5271 to 5274.