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2
Attach the scale clamps loosely (1 or 2 full turns looser than the semi-tightened position) by using the
mounting screws, as shown in the figure.
BS77-70N/NS, 270N/NS, 320N/NS
M4 x 8
Plain washer
3
Check the mounting surface and the datum surface of the scale for dust and dirt. If the surfaces are dirty,
wipe them clean with gauze moistened with alcohol.
4
Insert the scale between the scale clamp and the mounting surface while pressing the scale (datum
surface) lightly against the reference abutment surface (Note). Gradually and alternately tighten screws
A and B of the scale clamp indicated in the figure. (Final fastening torque: 1.4 N.0m = 14 kgf.cm)
BS77-70N/NS, 270N/NS, 320N/NS
B
A
n
When pressing the scale against the reference surface, lightly press two points on the edge of the scale surface opposite
the reference surface with your fingers with a force of 9.8 N = 1 kgf or less as shown in Figure 1 below.
If the middle part of the scale is pressed with a force of 4.9 N = 0.5 kgf or more, as shown in Fig. 2 below or if the scale is
installed with deformation, the specified accuracy cannot be achieved. (This also applies to the following procedures. If it
appears that the scale has been bent by force, loosen the scale clamp and mount it again properly.)
BS77
BS77-120N/NS, 170N/NS, 220N/NS, 370N/NS, 420N/NS
Scale clamp
Spacer
Reference plate
BS77-120N/NS, 170N/NS, 220N/NS, 370N/NS, 420N/NS
CORRECT
Reference plate
Mounting surface
Datum surface
B
A
Fig. 1
WRONG
7
(E)
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