Renishaw RGH24 User manual

Installation guide
M-9541-0035-03-A
RGH24/25 Scale guide
Scale applicator tool for RGH24 and RGH25 readhead installations
The RGA245 scale guide is mounted in place of any Renishaw RGH24 or RGH25 readhead
and uses the motion of the axis to apply RGS20-S tape scale parallel to the guideway whilst
simultaneously removing the backing paper - a one man, one hit operation.
Scale installation
Prepare scale and surface
Ensure scale is cut to correct length and mounting surface has been prepared
(refer to Scale installation guide M-9517-2855 for details).
Install the scale guide
Mount the scale guide to the readhead bracket as shown in Figure 1.
Be careful to check that the readhead and the scale guide have the same orientation, as the
readhead does not lie centrally over the scale.
Move the guide to the start of axis travel. Note the direction of scale application as shown
in Figure 2.
Figure 1
Mounting screws
Readhead mounting bracket
RGA245
Scale guide
Splitter screw
Limit of travel
Figure 2
Splitter screw
Direction of
scale application
Limit
stop
RGS-S
tape scale
Backing paper
RGA245
Scale guide
>20 mm

Renishaw plc
New Mills, Wotton-under-Edge,
Gloucestershire GL12 8JR
United Kingdom
T+44 (0)1453 524524
F+44 (0)1453 524901
[e-mail]
www.renishaw.com
© 1999-2004 Renishaw plc Issued 0904 Renishaw reserves the right to change specifications without notice
For worldwide contact details, please visit our
main website at www.renishaw.com/contact *M-9541-0035-03*
Load the scale into the scale guide

Remove the splitter screw (see figure 1) from the scale guide body by turning until the flats on
the screw are parallel to the slot.

Separate the backing paper from the first 40mm of scale and feed it into the scale guide
as shown in Figure 2 and lock in place by turning through 90°.

Relocate the splitter screw behind the backing paper as shown in Figure 2.

Push the scale carefully through to the end of scale mark, ensuring that it does not stick to the
mounting surface until it is in position.
NOTE: To prevent the scale sticking to the mounting surface during this operation it may be
necessary to re-apply approximately 20 mm of backing paper to the end of the scale before
inserting through scale guide. This can then be removed before fitting end clamps.

Attach the end of the scale to the mounting surface with light finger pressure.
Apply the scale

Traverse the axis through its full travel at a slow, steady speed.

While moving the axis apply a light finger pressure to the scale behind the scale guide
to attach it to the mounting surface.

Gently pull the backing paper away from in front of the scale guide as it is separated.
Remove the scale guide

When the axis has reached the limit of its travel, lock the axis in place and unbolt the
scale guide from the readhead mounting bracket.

Withdraw the scale guide along the scale whilst applying the remaining scale using
light finger pressure.
Ensure complete adhesion of the scale to the mounting surface by applying firm finger pressure
along the full length of the scale from the centre outwards to each end.
Fit end clamps part number A-9523-4015 (refer to Scale installation guide M-9517-2855 for details).
Scale handling precautions
Reel for lengths
over 1 m
Keep coils tight
during storage
Plastic extrusion for
lengths under 1 m
Scale surface
is immune to
handling
No sharp objects
Do not twist
>100 mm
DO NOT remove the scale for refitting or use elsewhere once it has been applied to the mounting surface.
Avoid aggressive solvents
refer to Scale installation guide
M-9517-2855 for details