Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 307

12. SERVO MOTOR
12.1.4 Servo motor shaft shapes
In addition to the straight shaft, keyway shaft and D cut shaft are available as the servo motor shafts.
The keyway shaft and the D cut shaft cannot be used in frequent start/stop applications. Since we cannot
warrant the servo motor against fracture and similar accidents attributable to a loose key, use a friction
coupling, etc. when coupling the shaft with a machine.
The shaft shape of the standard servo motor varies depending on the capacity. Refer to sections 12.5.4 and
12.6.4.
The keyway shaft (with single pointed key) is available only with the HF-KP G7 HG-KR G7 servo motor.
Shaft
Shaft
section
section
view view
Keyway shaft (with key) Keyway shaft (without key)
Shaft
section
view
D cut shaft Straight shaft
Shaft
section
view
Keyway shaft (with single pointed key)
12 - 4