Magnescale SR138-025R Instruction Manual page 66

(2) Checking of mounting position and tapping
Check that the parallelism for mounting scale part meets the
specifications, and then tap for M4 screws of 10 mm/0.39"
depth referring to the outline drawing on page 34.
(3) Mounting of scale part
Mount the scale part loosely with M4×10 hexagonal socket
head cap screws and plain washers (large), and leave it for 30
minutes for the scale part to reach ambient temperature.
Then firmly mount the scale.
(4) Measuring parallelism of scale part with machine
table movement
Place a pick tester or dial gauge directly where the alignment
mark (Fig. 3-7 1) is positioned on the side of the scale part,
and check that the scale part is surely mounted parallel to the
machine table movement.
2
Fig. 3-7 Parallelness check of scale part and machine table movement
14 (E)
1
Alignment mark
Adjust the parallelism of the length between the two alignment
marks to within 0.08 mm/0.003" and tighten the setscrews. For
the scale with a measuring length of 1050 mm/41.3" or more,
adjust the parallelisms of the lengths between the alignment mark
and those on both sides of it to within 0.08 mm/0.003".
Note
Since alignment marks are not provided on scales part with a
measuring length of 150 mm/5.9" or less, place the pick tester or
dial gauge on the scale part and ensure that the allowance at the
two ends of the machine travel is within 0.08 mm/0.003".
Foot
Alignment marks
Alignment marks
Plain washer
(M)
M4×10
Fig. 3-8 Parallelism check by alignment marks
Foot
Alignment marks