LM Guide Actuator KR - THK - #17

The precision of the Model KR is determined by repeat positioning accuracy, positioning accuracy, backlash, and travel parallelism.

Positioning from the same direction is repeated at any position seven times, the stop position is measured at each operation, and half of the maximum error in the readings is obtained. This measurement is basically performed at each position in the center and at both ends of the travel distance. The largest of the obtained values is taken to be the measurement value, and is indicated by adding the ±sign to half the maximum error.

The maximum stroke is taken to be the reference

length, and the maximum error between the actual

traveled distance from the reference position and the instructed distance is expressed as an absolute

value.

Feed is applied to the nut block, and the reading on the test indicator obtained when slight movement is

applied is taken to be the reference. A load is then applied on the nut block from the same direction (table feed direction) from that state independent of the feed equipment, and the subsequent error between the return and reference after movement is canceled is taken to be the measurement value.

This measurement is performed at each position at the center and at almost both ends of movement, and the largest of the obtained values is taken to be the measurement value.

A straightedge is placed on a leveling plate mounted with the KR, and parallelism is measured over almost

the entire travel distance of the nut block using a test indicator. The maximum error in the reading within the travel distance is taken to be the measurement value.

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