Disc Specifications - Renishaw ATOM Installation Manual

Disc specifications

Material
Reference mark
Graduation accuracy Discs < 100 mm
Discs > 100 mm
Disc size (mm) 17 20
Graduation accuracy
15.81 12.95
(arc seconds)
Coefficient of thermal expansion
Nominal outer diameter (mm)
40 µm
20 µm
62 ATOM rotary encoder system
Soda lime glass (2.3 mm thick)
Single reference mark
±0.5 μm
±0.7 μm
25 27 30 36 50 56
9.82 9.0 7.91 6.49 4.5 3.95
~8 µm/m/°C
17, 20, 25, 27, 30, 36, 50, 56, 68 and 108
30, 36, 50, 56, 68 and 108
68 108
3.24 2.78