CHAPTER 15 APPENDIXES

Approximate mechanical efficiency η

Mechanism

Trapezoidal screw thread

Ball screw

Rack & Pinion

Gear reducer

Worm reducer

(starting)

Worm reducer

(during operation)

Belt transmission

Chain transmission

Mechanical efficiency

0.5 to 0.8

0.9

0.8

0.8 to 0.95

0.5 to 0.7

0.6 to 0.8

0.95

0.9

Module

(Module) =

(Pitch circle diameter of gear)

(Number of teeth)

* Module

0.5 0.75 0.8 1 1.5 2 2.5 3 4 5 6 7

* Metric gear

Chain size

No.

Pitch

No.

Pitch

15

4.762

80

25.4

25

6.35

100

31.75

35

9.525

120

38.1

40

12.7

140

44.45

50

15.875

160

50.8

60

19.05

180

57.15

15

15.5.2 Capacity Selection Calculation

Perform capacity selection calculation to obtain the servomotor capacity necessary for machine

specifications (configuration).

Items necessary for capacity selection calculation include the following.

 Load inertia (moment of inertia of mechanical system)

 Load torque (torque necessary to move the machine)

 Acceleration/Deceleration time

 Operation profile

In general, there is no way to measure the inertia of the mechanical system and load torque, calculate

approximate values according to the configuration of the machine.

15-16 Capacity Selection Calculation