4-6
4. Assembly
4.
Assembly
LM Guide
4-2
When Measuring the Running Accuracy for Single Rail
Application
When measuring running accuracy of the LM block, stable accuracy can be obtained by securing
two LM blocks on an inspection plate, as shown in Figure 4-17. When using a dial gauge, we
recommend placing a straight-edge as close as possible to the LM block in order to perform
accurate measurement.
2) Measurement method using a dial gauge1) Measurement method using an autocollimator
Figure 4-17 Methods for Measuring Accuracy after Installation
4-3
Recommended Tightening Torque for LM Rails
On the high-precision LM rails of the LM Guide, the rails are tightened with bolts for the final
grinding of the raceways and for the accuracy inspection. When mounting a high-precision LM
rail onto a machine, we recommend using the corresponding tightening torque indicated in
Table 4-1 or Table 4-2.
Table 4-1 When Using Pan Head Screws
Unit: N-cm
Screw model No.
Tightening torque
Not hardened Hardened
M 2 17.6 21.6
M 2.3 29.4 35.3
M 2.6 44.1 52.9
Table 4-2 When Using Hexagonal-Socket-
Head Type Bolts
Unit: N-cm
Screw model No.
Tightening torque
Iron Casting Aluminum
M 2 58.8 39.2 29.4
M 2.3 78.4 53.9 39.2
M 2.6 118 78.4 58.8
M 3 196 127 98
M 4 412 274 206
M 5 882 588 441
M 6 1370 921 686
M 8 3040 2010 1470
M 10 6760 4510 3330
M 12 11,800 7840 5880
M 14 15,700 10,500 7840
M 16 19,600 13,100 9800
M 20 38,200 25,500 19,100
M 22 51,900 34,800 26,000
M 24 65,700 44,100 32,800
M 30 130,000 87,200 65,200
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