LAH-80 Series Technical Document
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4-2 Performance evaluation method
(1) One-way positioning accuracy (in compliance with JIS B6201)
a) Move the output rod to the specified lead-in side limit, and then move it 1mm to the push-out direction.
The position is the reference position.
b) From the reference position to the push-out direction, perform positioning sequentially for 50mm (2mm) in
steps of 0.5mm (0.02mm), and measure each of the positions.
c) At each position, an error is the difference between the distance of actual movement from the reference
position and the expected distance of movement. The positioning accuracy is the maximum difference
of these errors.
(2) Repeatability (in compliance with JIS B6201)
a) Move the output rod to the push-out direction, and then move it to the center of displacement (±0mm).
b) From that position, feed it 1mm to the push-out direction. The point is A1.
c) From Point A1, feed it 1mm to the pull-in direction, and measure the point. The point is P1.
d) From P1, feed it 1mm again to the push-out direction. The point is A2. From A2, return it 1mm to the
pull-in direction, and measure the point. The point is P2.
e) Repeat this 7 times. The repeat positioning accuracy is 1/2 the maximum difference of P1
、
P2
…
…、
P7 with (
±
).
1 step: 0.5mm (0.02mm)
Erro
rs
Po
sit
io
nin
g
ac
cur
ac
y
Figure 2
Center position
Repeatability
Figure 3
Note: Values in parentheses are for accuracy
measurement with a travel of 2mm.
