Chapter 1 Overview of the RSF supermini series
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11
1-6 One-way positioning accuracy
The following table shows the “one-way positioning accuracy” and “repeated positioning accuracy.”
The following table contains representing values. (JIS B 6201:1987)
The one-way positioning accuracy of RSF supermini actuators is almost equal to the angular
positioning accuracy of the Harmonic® drive gearing, because the effect on the positioning error of the
built-in motor is reducted to its 1/30 or 1/50 or 1/100 by the gearing.
The accuracy for each gear ratio is shown below.
Mode
RSF-3C
RSF-5B
Gear ratio
Item
30
50
100
30
50
100
One-way positioning accuracy
arc min
10
4
3
3
rad
2.9
"
10
-3
1.20
"
10
-3
0.87
"
10
-3
0.87
"
10
-3
Reference
(Accuracy display and measurement method according to JIS B 6201: 1987)
One-way positioning of rotation shaft motion
First, perform positioning at any one position in a fixed
direction. This position is the reference position. Next,
perform positioning in succession in the same direction,
and measure the difference between the angle actually
rotated from the reference position and the desired angle
at each position. The maximum difference in one
rotation among these values is taken as the measurement
value. Measurement of equipment with the continuous
positioning function for rotational motion shall be done
once per 30 degrees or 12 positions throughout the entire
rotation range as a rule.
Start position
Actual position
One-way positioning
accuracy
Positional difference
