Chapter 2 Engineering Design of Servo Mechanism
19
(b) Shaft direction clearance
Repeat positioning accuracy: ± 0.010 (mm)
Min. resolution: 0.01 mm/pulse
From the above,
Shaft direction clearance: T clearance 0.005 (mm) or less
Table 2-2. Combination of accuracy grade and shaft direction clearance
Unit: mm
Z T S N L
Shaft direction
clearance
Accuracy grade
0
(Pre-load)
0.005
or less
0.020
or less
0.050
or less
0.3
or less
C0 C0Z C0T – – –
C1 C1Z C1T – – –
C2 C2Z C2T – – –
C3 C3Z C3T C3S – –
C5 C5Z C5T C5S C5N –
C7 – – C7S C7N C7L
[Results]
Use the following spec. ball screw.
Shaft dia. 20 (mm), lead 20 (mm)
Screw length (temporary) 800 mm
Accuracy grade C5 shaft direction clearance T (0.005 mm or less)
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