Data sheet
L-9517-9348-01-B
RGSZ20 scale
Renishaw’s patented RGSZ20
20 µm gold scale features
customer selectable optical
IN-TRAC TM reference marks.
Uniquely these are directly
embedded into the
incremental channel to enable
electronic auto-phasing
simply by pressing a button.
RGSZ20 scale is suitable for use with the
new
encoder, featuring dynamic
signal processing, ultra-low cyclic error
(±30 nm) and resolutions to 1 nm.
The scale is supplied with a specially
formulated adhesive backing tape.
Installation is quick, easy and suits both
high volume production and one-off field
service installations.
To simplify customer inventory and
maximise production flexibility, the scale
can be supplied on a reel for ‘cut-to-suit’
convenience at the point of installation.
RGSZ20 is suitable for mounting to most
common engineering materials including
metals, granites, ceramics and composites,
whilst the RGSZ20-P polyester coated
version has an increased resilience to
solvent and lubricant attack.
The scale ends are rigidly fixed to the axis
substrate by means of epoxy fastened
end clamps, eliminating the need to drill
holes. Because the scale has a very small
cross section, it is ‘mastered’ to the
substrate and matches its thermal
expansion. Differential movement
between the scale and the substrate is
close to zero, even throughout significant
temperature swings.
• IN-TRAC optical reference
marks embedded directly into
the incremental channel
• Compatible with the new
encoder system
• ‘Cut-to-length’ flexibility
• Lengths from 100 mm to
over 50 m
• Protective lacquer or tough
polyester coating option for
applications using harsh
solvents
• Quick and easy one-person
installation
• Affixes to most common
engineering materials
• Self-adhesive
• Dual limits provide end of
travel indication
• Linearity of ±3 µm/m;
±0.75 µm/60 mm
• RGSN20 version is
supplied without IN-TRAC
reference marks
50 ±0.1
0.5
F
Q limit trigger point
The reference mark selector and limit actuator locations are correct for the readhead orientation shown.
NOTE 3:
For detailed information on installing the readhead and accessories refer to Installation Guide T100x (M-9653-9154).
F = axis of motion
NOTE 2:
Readhead optical detector position at extent of travel
P limit trigger point
(NOTE: RGSN20 is supplied without reference marks)
6
0.2/100
Reference mark spacing
//
35
9.75
10
15
0.1
End clamp
Reference mark
selector and
P/Q limit detail
13.5
Q limit
(20 when Q limit not used)
1.5
13
3.7
NOTE: This edge of the reference
mark selector magnet base plate
should be aligned to within ±1 mm
of the IN-TRAC reference mark
0.2
Dimensions and tolerances in mm
The surface roughness of the substrate must be better than 3.2 µm. The parallelism of the scale surface to the axis guideway
(readhead ride height variation) must be within 0.05 mm.
30
P limit
Reference mark
selector
Forward direction of
readhead relative to scale
Measuring length (ML)
RGSZ20 scale installation drawing
NOTE 1:
15
20
Scale length
Overall length ML + 85 (ML + 70 when Q limit not used)
Data sheet
RGSZ20 scale
Technical specifications
Scale
Type
RGSZ20-S: High stability gold plated steel tape with protective polymer coating.
Fitted with a self adhesive backing tape.
RGSZ20-T: High stability gold plated steel tape with protective polymer coating.
No self adhesive backing tape.
RGSZ20-P: High stability gold plated steel tape with tough polyester coating for use in
applications requiring resistance to harsh solvents. Fitted with a self adhesive backing tape.
RGSZ20-Q: High stability gold plated steel tape with tough polyester coating for use in
applications requiring resistance to harsh solvents. No self adhesive backing tape.
NOTE: RGSN20 variants of all above scales are manufactured without reference marks.
Scale pitch
20 µm
Linearity
RGSZ20-S and RGSZ20-T: ±3 µm/m; ±0.75 µm/60 mm
RGSZ20-P and RGSZ20-Q: ±5 µm/m; ±1.5 µm/60 mm
Scale length
100 mm to 50 m in 50 mm increments (>50 m by special order)
Substrate materials
Metals, ceramics and composites with expansion coefficients between 0 and 23 µm/m/°C
(e.g. steel, aluminium, invar, granite, ceramic etc.)
Expansion coefficient
Matches that of substrate material with scale ends fixed by epoxy mounted end clamps
End fixing
Epoxy mounted end clamps (A-9523-4015)
Approved epoxy adhesive (A-9531-0342)
Performance <1 µm movement over temperature range -20 to 50 °C
Operating specification
Temperature: -10 to 120 °C (Scale only, also refer to readhead Data sheet)
Minimum installation temperature: 10 °C
Humidity: 80% maximum RH (non-condensing)
Reference mark
Type
IN-TRAC reference mark, directly embedded into incremental track
50 mm (nominal) spacing
Bi-directional position repeatability
Selection
Single reference mark selection by magnetic actuator (A-9653-0143) customer positioned
Repeatability
Unit of resolution repeatability (bi-directional) across full system rated
speed and temperature ranges
Limit switches
Type
Magnetic actuators; with dimple triggers Q limit, without dimple triggers P limit
Trigger point
The limit output is nominally asserted when the readhead limit switch sensor passes the limit
magnet leading edge, but can trigger up to 3 mm before that edge
Mounting
Customer placed at desired locations
Repeatability
< 0.1 mm
(see diagram opposite)
Renishaw plc
New Mills, Wotton-under-Edge,
Gloucestershire GL12 8JR
United Kingdom
T +44 (0)1453 524524
F +44 (0)1453 524901
E [email protected]
www.renishaw.com
Accessories
Limit and reference mark magnets
Magnetic actuators allow the customer to choose the desired location of
their limits and the appropriate reference mark for their application.
Reference mark selector – A-9653-0143
10 mm P limit, North pole facing – A-9653-0138
10 mm Q limit, South pole facing – A-9653-0139
20 mm P limit, North pole facing – A-9653-0237
20 mm Q limit, South pole facing – A-9653-0238
50 mm P limit, North pole facing – A-9653-0235
50 mm Q limit, South pole facing – A-9653-0236
The limit and reference mark magnets are supplied mounted with
adhesive backing tape for ease of application.
Magnet applicator
The magnet applicator (A-9653-0201) is designed to aid installation and
positioning of limit and reference mark magnets relative to the scale.
RGAT scale applicator
The RGAT (A-9653-0182) is designed specifically for use with
installations. It is mounted in place of the readhead and uses the motion
of the axis to apply the scale parallel to the guideway – a one-hit,
one-person operation.
End clamps
Epoxy-mounted end clamps ensure scale expansion coefficient masters to
the substrate. Available in two forms; standard (A-9523-4015) and narrow
(A-9523-4027).
For worldwide contact details, please visit our
main website at www.renishaw.com/contact
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AT THE DATE OF PUBLICATION BUT MAKES NO WARRANTIES OR REPRESENTATIONS REGARDING THE CONTENT.
RENISHAW EXCLUDES LIABILITY, HOWSOEVER ARISING, FOR ANY INACCURACIES IN THIS DOCUMENT.
RENISHAW® and the probe emblem used in the RENISHAW logo are registered trademarks of Renishaw plc
in the UK and other countries. apply innovation is a trademark of Renishaw plc.
© 2009 Renishaw plc
All rights reserved
Issued 1109
*L-9517-9348-01*