Rcdm Rotary Disc Installation Drawing - Renishaw ATOM Installation Manual

RCDM rotary disc installation drawing

Set-up LED
'A' ± 'E'
Forward direction
of disc
(increasing count)
Alignment band for
aligning the disc
on the hub /shaft
(Pitch tol. ±1°)
0.36
Rideheight (for calibration):
2.5 ±0.08 (40 µm version)
2.5 ±0.04 (20 µm version)
Operating rideheight:
2.5 ±0.11 (40 µm version)
2.5 ±0.055 (20 µm version)
ATOM
rotary installation guide
Centre of alignment band
10.25 ± 'F'
Reference mark
Centre of
alignment band
FPC cable
D1
D2
D3
2.3
Glass disc
Black mask 10 µm (±5 µm) thick on reverse of disc
underneath incremental and reference track
(Roll tol. ±1°)
0.22
For detailed installation drawings, including tolerances, refer to www.renishaw.com
Line count
Disc size D1 D2
(mm) 20 µm 40 µm (mm) (mm) (mm)
version version
17 – 1 024 3.275 8.10 16.9
20 – 1 250 3.275 11.00 19.9
25 – 1 650 6.46 16.10 24.9
27 – 1 800 9.625 18.00 26.9
30 4 096 2 048 12.8 21.15 29.9
36 5 000 2 500 12.8 26.90 35.9
50 7 200 3 600 25.5 40.90 49.9
56 8 192 4 096 25.5 47.25 55.9
68 10 000 5 000 25.5 58.55 67.9
108 16 384 8 192 50.9 99.20 107.9
Dimensions and tolerances in mm
Radial tolerance
E (mm)
D3 Optical diameter
A
(mm) (mm) 20 µm 40 µm
version version
13.04 10.63 –
15.92 12.07 –
21.01 14.62 – 0.125
22.92 15.57 – 0.125
26.08 17.15 0.1 0.125
31.83 20.03 0.125 0.175
45.84 27.03 0.125
52.15 30.19 0.125
63.66 35.94 0.15
104.30 56.26 0.2
Longitudinal tolerance
F (mm)
20 µm 40 µm
version version
0.1 – 0.1
0.1 – 0.1
– 0.075
– 0.075
0.075 0.125
0.075 0.2
0.2 0.075 0.2
0.2 0.1 0.225
0.2 0.125 0.3
0.2 0.225 0.3
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