Table of Contents
Advertisement
14 Installation procedure – extrusion
Please note that fitment of the extrusion is independent of readhead mounting. For illustrative
purposes, a datum edge is displayed, but the procedure is identical for dowel pins. Where neither
an edge or dowel pins are available, begin by aligning the extrusion mounting holes.
NOTES:
1.
If a suitable reference edge or dowel pins are not available then we recommend that the
extrusion is checked against a dial gauge to ensure parallelism to the machine axis.
2.
For measuring lengths greater than 620 mm Renishaw recommends the use of a mounting
spar (see
section 14.4
on page 27).
3.
Ensure the mounting faces are clean before installation.
14.1 Protection for sealed linear encoders
IP53 requires installation with sealing lips positioned away from splash water in accordance with
EN 60529/IEC 60529.For ingress protection to IP64, please see
14.2 Thermal datum
The thermal datum of the encoder is located centrally. The coefficient of thermal expansion (CTE)
of the encoder is 10.1 ±0.2 μm/°C.
The standard end cap version is mounted using two M8 screws; a high clamping torque of 20 Nm
enables the extrusion to follow the expansion of the mounting surface material.
For measuring lengths > 620 mm a mounting spar is recommended; please refer to sections
14.5
620 mm.) The aluminium mounting spar's fixed central mounting hole provides a centrally located
thermal datum position. The other mounting positions use flexures to allow the spar to effectively
float over the machine's surface, ensuring reproducible thermal behaviour.
A short end cap version is recommended for use with the mounting spar.
NOTE: If the short end cap version of the encoder is installed directly onto a different mounting
surface using two M4 screws without using the mounting spar, its thermal datum properties will be
compromised.
section 15.8
on page 39.
and
14.6
for full details. (If required, a mounting spar can be used for measuring lengths under
14.4,
www.renishaw.com
25
Advertisement
Table of Contents
