Scale Application; End Clamps - Renishaw RGH22 Installation Manual

Scale application

RGA22 - scale applicator
(recommended for longer axes)
The RGA22 scale applicator kit (A-9531-0265) is designed specifically
for installing RGS20-S scale for use with the RGH22 readhead.
When installing RGS20-P scale use applicator kit (A-9531-0280).
For instructions on how to use the RGA22 please refer to the
'RGA22 scale applicator User's guide' (M-9531-0297).
RGA22G - scale applicator
(recommended for shorter axes or where space is limited)
The RGA22G scale applicator (A-9531-0239) is designed specifically for installing RGS20-S scale for use with
the RGH22 readhead. When installing RGS20-P scale use scale applicator (A-9531-3528).
1
Allow scale to acclimatize to installation environment prior to installation.
2 Mark out 'START' and 'FINISH' points for the scale on the axis substrate. Ensure that there is room for the
end clamps (see 'RGS20 installation drawing').
3 Thoroughly clean and degrease the substrate using recommended solvents (see 'Storage and handling').
Allow substrate to dry before applying scale.
4 Mount the scale applicator to the readhead mounting bracket using M3 screws. Place the shim supplied
with the readhead between the applicator and substrate to set the nominal height.
NOTE: Scale applicator can be mounted either way round
to enable easiest orientation for scale installation.
5
Move axis close to scale start position, leaving enough room for the scale to be inserted through the
applicator, as shown below.
6
Begin to remove the backing paper from the scale
and insert scale into the applicator up to the
'START' point (as shown).
Ensure backing tape is routed
under the splitter screw.
7 Apply finger pressure to the scale at the 'START' point, using a clean lint-free cloth, to ensure scale end
adheres well to the substrate.
Direction of scale application
Scale
Splitter screw
Backing paper
RGH22 RGS20 installation guide
'START' point
M3 mounting holes
START
8
Slowly and smoothly move the applicator through the entire axis of travel, ensuring the backing
paper is pulled manually from the scale and does not catch under the applicator.
9
Remove applicator and, if necessary, adhere the remaining scale manually.
Apply firm finger pressure via a clean lint-free cloth along the length of the scale after application
to ensure complete adhesion
10
Clean scale using Renishaw scale cleaning wipes (A-9523-4040) or a clean, dry, lint-free cloth.
11 Fit end clamps (see 'End clamps' section).
12
Allow 24 hours for complete adhesion of scale before fitting reference mark and limit magnets.

End clamps

A-9523-4015 is an end clamp kit designed to be used with Renishaw RGS scale.
IMPORTANT: End clamps should be used to ensure positional stability of the scale and
reference mark repeatability.
NOTE: End clamps can be mounted before or after readhead installation.
1
Remove the lacquer coating from the
last 15 mm of each end of the scale
with a knife and clean with one of
the recommended solvents
(see 'Storage and handling').
3
The end clamp features two small regions
of contact adhesive. These will temporarily
hold the end clamp in position while the
glue cures. Remove the backing tape
from either side.
Ensure that excess glue is wiped away from scale as it may affect the readhead signal level.
2
Thoroughly mix up a sachet of glue
(A-9531-0342) and apply a small amount
to the underside of the end clamp.
4
Immediately position end clamp
over the end of the scale.
Allow 24 hours at 20 °C
for full cure.
5