CHAPTER 15 APPENDIXES
15-16
Capacity Selection Calculation
15
Module
* 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
15.5.2 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.
(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
Approximate mechanical efficiency η
Mechanism Mechanical efficiency
Trapezoidal screw thread 0.5 to 0.8
Ball screw 0.9
Rack & Pinion 0.8
Gear reducer 0.8 to 0.95
Worm reducer
(starting)
0.5 to 0.7
Worm reducer
(during operation)
0.6 to 0.8
Belt transmission 0.95
Chain transmission 0.9
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