5.1 Example Setting of Motion Parameters for the Machine
5.1.2 Electronic Gear
5-3
Motion Parameter Setting Examples
The following setting example uses ball screw and rotating table workpieces.
( 1 ) Parameter Setting Example Using Ball Screw
• Machine specifications: Ball screw axis rotates 5 times for each 7 rotations of the motor axis (Refer to the follow-
ing figure.)
• Reference unit: 0.001 mm
To move the workpiece 0.001 mm for 1 reference unit input under the conditions outlined above, i.e., for 1 reference
unit = 1 output unit, make the following settings for fixed parameters 6, 8, and 9.
•
Fixed Parameter 6
: Travel Distance per Machine Rotation = 6 mm/0.001 mm =
6000
(reference units)
•
Fixed Parameter 8
: Servo Motor Gear Ratio = m =
7
•
Fixed Parameter 9
: Machine Gear Ratio = n =
5
Set the SERVOPACK gear ratio to 1:1. However, if you are using a
Σ
-7-series SERVOPACK, refer to
11.8 Pre-
cautions When Using
Σ
-7-series SGD7S SERVOPACKs with Rotary Servomotors
and set the SERVOPACK’s
electronic gear.
( 2 ) Parameter Setting Example Using Rotating Table
• Machine specifications: Rotating table axis rotates 10 times for each 30 rotations of the motor axis (Refer to the
following figure.)
• Reference unit: 0.1
°
To rotate the table 0.1
°
for 1 reference unit input under the conditions outlined above, i.e., for 1 reference unit = 1 out-
put unit, make the following settings for fixed parameters 6, 8, and 9.
•
Fixed Parameter 6
: Travel Distance per Machine Rotation = 360
°
/0.1
°
=
3600
(reference units)
•
Fixed Parameter 8
: Servo Motor Gear Ratio = m =
30
•
Fixed Parameter 9
: Machine Gear Ratio = n =
10
The gear ratio for fixed parameters 8 and 9 (m/n) may be constant, e.g., m = 3 and n = 1.
Set the SERVOPACK gear ratio to 1:1. However, if you are using a
Σ
-7-series SERVOPACK, refer to
11.8 Pre-
cautions When Using
Σ
-7-series SGD7S SERVOPACKs with Rotary Servomotors
and set the SERVOPACK’s
electronic gear.
Ball screw
Workpiece
P (pitch) = 6 mm/rotation
m = 7 rotations
n = 5 rotations
Motor
Workpiece (Rotating table)
360
°
/rotation
n = 10 rotations
Motor
m = 30 rotations