3
RGH25F readhead installation drawing
Dimensions and tolerances in mm
RGH25F RGS20 installation guide
*
Dimensions measured from substrate.
†
Required nominal 0.8 gap can be set using blue readhead spacer (supplied) positioned between readhead and actuator when positioning
/fixing the actuator.
‡
The recommended thread engagement is 5 mm. The recommended tightening torque is between 0.5 and 0.7 Nm.
Reference mark
actuator
(A-9541-0037)
6.2
27
21
Fixing screws
M3 x 0.5 x 8
8
0.3
11.5
*
6 (RGS20-S)
6.3 (RGS20-P)
3.8
4.8
0.09
8.5
*
36
26
21.1
8.5
> 4
2 mounting holes
M3 x 0.5 through
‡
Optical centreline
Reference mark
sensor position
4
*
8
*
A
0.6
Detail A
Scale surface
0.8 ± 0.1
Rideheight
Readhead to
scale clearance
9.5
4
(Yaw tol. ± 0.5°)
(Roll tol. ± 1°)
(Pitch tol. ± 1°)
R>20 dynamic bend radius
R>10 static bend radius
Ø4.4
max
13.5
Arrow indicates forward direction
of readhead relative to scale
3
Alternative
mounting face
Mounting face
(Extent of mounting faces)
Scale thickness
0.2 (RGS20-S)
0.3 (RGS20-P)
( )
0.8 -0.1
+0.2
See note
†