Readhead Mounting And Alignment; Methods; Shim Kit - Renishaw ATOM Installation Manual

Readhead mounting and alignment

Methods

There is a range of tools available to assist with readhead installation depending upon the
system design; these are detailed below. For more details on designing the mounting bracket and
selecting the appropriate mounting tools, contact your local Renishaw representative.
Ensure that the disc, readhead optical window and mounting face are clean and free from
obstruction.
CAUTION: Do not saturate the readhead window with cleaning solvent as this may cause
contamination on the inside of the readhead window which cannot be cleaned.
AGC should be switched off before installing the readhead and, when reinstalling, factory defaults
should be restored.
NOTE: For FPC readheads, the FPC cable must be fitted prior to mounting the readhead. See
page 18 for more details.
IMPORTANT: Whichever method is used to mount the readhead, care should be taken to ensure
the scale surface is not damaged during this operation, particularly when metal-to-metal contact
is necessary.
28 ATOM rotary encoder system

Shim kit

Suitable for:
• Applications where the rideheight of the readhead cannot be adjusted. The system should
be designed to achieve a nominal distance of 2.3 mm (±0.2 mm) from the readhead
mounting surface to the disc surface.
Mounting bracket
Disc
Shims of a known thickness are inserted between the mounting face of the readhead and the
bracket to give the correct rideheight.
Required parts:
• Digital dial gauge (DTi) or similar
• 2 × M2 × 6 screws
• ATOM readhead Shim kit (A-9401-0050) constisting of:
Part number Thickness Quantity
(µm) in pack
A-9401-0041 20 10
A-9401-0042 40 10
A-9401-0043 60 10
A-9401-0044 80 10
A-9401-0045
100 20
A-9401-0046
200 20
A-9401-0047 300 10
Optional parts:
• DTi adaptor (A-9401-0105)
Location pins
2.3 ±0.2 mm