Renishaw TONiC T20 1 Series Installation Manual page 11

T20x1 readhead and REXM/REXT compatibility
T20x1 readhead models are compatible with a range of REXM/REXT ring sizes.
The optical configuration is optimised for the following conditions:
Readhead model REXM/REXT diameter range (mm)
T2001
T2011
T2021
Published performance specifications and operating tolerances only apply where the correct
readhead model conforms to the REXM/REXT size range. Ensure readhead part number
and REXM/REXT size range compatibility at the time of ordering and installation.
Reference mark position
REXM
IN-TRAC reference mark is integrated in the scale, radially aligned with the
™
centre of the mounting hole to the left of the 'Renishaw' logo within ±0.5 mm.
No external actuator or physical adjustment is required.
REXT
The second reference mark is 180° from the first.
>136
60 to 136
<60
Readhead mounting and alignment
Mounting brackets
The bracket must have a flat mounting surface and should enable conformance to the installation tolerances,
allow adjustment to the rideheight of the readhead, and be sufficiently stiff to prevent deflection or vibration of
the readhead during operation.
Readhead set-up
Ensure that the scale, readhead optical window and mounting face are clean and free from obstructions.
To set nominal rideheight, place the readhead spacer with the aperture under the optical centre of the
readhead to allow normal LED function during set-up procedure.
Adjust the readhead to maximise the signal strength and achieve a green set-up LED on the readhead
(70 to 135% signal). If a digital Ti interface is used, aim for a blue LED on the interface.
NOTE: The readhead should be installed and set-up with the AGC switched off.
Readhead set-up LED status
Green Orange Red
Optical centreline
Pitch
0° ±1.0°
Yaw
0° ±0.4°
Roll
0° ±1.0°
Green spacer
Rideheight
2.1 ± 0.15 mm