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Step 2
VIONiC RESM20/REST20 angle encoder system
X
Remove the protective film from the surface of the
RESM20/REST20.
X
Clean shaft taper and internal taper of the
RESM20/REST20 as recommended in
and handling', page
3.
X
Insert the first screws:
- For RESM20/REST20 rings with 6, 9 or 18
mounting holes, use 3 equally spaced
M3 screws.
- For RESM20/REST20 rings with 12, 16 or 20
mounting holes, use 4 equally spaced
M3 screws.
NOTE: Do not lubricate screws.
NOTE: Recommended screw type M3 × 0.5:
ISO 4762/DIN 912 grade 10.9 minimum/ANSI
B18.3.1M.
X
Insert the screws so that the RESM20/REST20 is
loosely connected to the shaft, then roughly align
the ring by eye and touch.
X
Lightly tighten the screws. Use a Dial Test Indicator
(DTI) to check the radial displacement at the
screw locations.
NOTE: Disregard the radial displacement between
the screw locations.
DTI
Use a DTI with low exertion force to avoid
scratching the scale surface. A DTI with a ruby
ball stylus is recommended as a further precaution
against scratches.
X
Adjust the screws to reduce the range of radial displacement. When adjusting, identify the screw
location with the lowest radial displacement and tighten that screw, aiming for the average of the highest
and lowest indicator readings.
X
Repeat this process until the DTI readings are within ±5 µm at the screw locations.
NOTE: It may be necessary to loosen screws whilst tightening other screws.
'Storage
Step 3
NOTE: At this stage, the screws
should only be lightly tightened
(less than 0.5 Nm) to allow
further final adjustment.
X
Insert the next screws:
- For RESM20/REST20 rings with 6, 9 or 12 mounting
holes, insert all the remaining M3 screws.
- For RESM20/REST20 rings with 16 mounting holes,
insert 4 equally spaced M3 screws.
- For RESM20/REST20 rings with 18 mounting holes,
insert 6 equally spaced M3 screws.
- For RESM20/REST20 rings with 20 mounting holes,
insert 8 equally spaced M3 screws (in four groups of
two) between existing screws.
X
As described in Step 2, adjust all the screws inserted thus
far so that the radial displacement at each screw location
is within ±5 µm.
X
Again, at this stage, the screws should only be lightly
tightened (less than 0.5 Nm).
NOTE: You may notice that the torque required to achieve
the radial displacement tolerance will be slightly higher
during Step 3 than during Step 2. This is normal.
8
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