LAH Series Manual
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5-2 Tips for evaluating performance
(1) Repetitive positioning accuracy (See Fig. 5.)
a) Move the output rod in the pushing direction to the stroke center position.
b) From that position, 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) Again, from point P1, feed 1mm in the pushing direction and mark that point as A2. From A2, move 1mm back in
the pulling direction, measure that point and mark it as P2.
e) Repeat this operation 7 times. Take one-half the value of the max. difference of the values P1 through P7 and
prepend (±) to the calculated value to obtain the repetitive positioning accuracy.
Fig.5
(2) Full stroke positioning accuracy (See Fig. 6.)
a) Move the output rod to the limit position on the pulling side, and then move it by 1mm from there in the pushing
direction. Mark that position as the datum position.
b) From the datum position, perform sequential positioning for the full stroke by feeding 0.2mm 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.6
