LAH Series Manual
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(3) Fine stroke positioning accuracy (See Fig. 7.)
a) Move the output rod in the pushing direction to the stroke center position. Mark that position as the datum
position.
b) From the datum position, perform sequential positioning for 100 p
oints (stroke 0.2mm) by feeding 2μm per step
in the pushing direction and measure each position.
c) At each position, the difference between the actual distance moved from the datum position and the distance to
be moved is considered as the erroneous difference. The greatest difference of the erroneous difference is the
positioning accuracy.
Fig.7
(4) Lost motion (See Fig. 8.)
a) Move the output rod in the pushing direction to the stroke center position. Mark that position as A0.
b) From A0, feed 1mm in the pushing direction. Mark that point as A1.
c) From point A1, feed 1mm in the pulling direction. Measure that point and mark it as P1.
d) From point P1, feed 1mm more in the pulling direction. Mark that point as A1'.
e) From point A1', feed 1mm in the pushing direction. Measure that point and mark it as P1'.
f) Repeat operations b) through e) 7 times. The difference between the average value of P1 through P7 and the
average value of P1' through P7' is the lost motion value.
Fig.8
