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Readhead mounting and alignment
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 top of the scale.
Readhead mounting surface
Shims of a known thickness are inserted between the mounting face of the
readhead and the bracket to give the correct rideheight.
Required parts:
Shim kit (A-9401-0050) constisting of:
Part Number
Thickness (µm)
A-9401-0041
A-9401-0042
A-9401-0043
A-9401-0044
A-9401-0045
A-9401-0046
A-9401-0047
Digital dial gauge (DTi) or similar
2 × M2 × 6 screws
ATOM readhead
Optional parts:
DTi adaptor (A-9401-0105)
ATOM linear installation guide
(continued)
2.3 ±0.2 mm
Quantity in pack
20
10
40
10
60
10
80
10
100
20
200
20
300
10
1.
Using a digital dial gauge or similar, measure
the distance from the readhead mounting
surface to the scale surface.
Care must be taken to ensure the scale
surface is not scratched.
– Insert the gauge into the adapter and
zero the gauge on a flat surface.
– Position or fix the gauge / adapter in
place of the readhead and measure
the distance to the scale surface.
Contact your local Renishaw representative
for details of the DTi adapter and digital
dial guage.
2.
Subtract the distance measured from the
nominal rideheight of 2.5 mm to calculate
the required shim thickness.
For example if the distance measured is
2.37 mm the required shim thickness
is 130 µm.
3.
Select a combination of two shims that gets
within 10 µm of the difference.
For distances less than 100 µm a single shim
should be used, for distances greater than
100 µm select one thick (≥ 100 µm) and one
thin (< 100 µm) shim.
In the above example this could either
be 1 × 100 µm shim and 1 × 40 µm shim
or 1 × 100 µm shim and 1 × 20 µm shim.
4.
Place the chosen shim(s) between the
readhead and the bracket.
5.
Fix the readhead to the bracket using screws
in diagonally opposite fixing holes, ensuring
readhead is tightened down evenly and
parallel to the bracket face.
6.
Connect the system up. See
pages 17 to 22
for relevant system connection.
7.
Check the readhead set-up LED is Green
along the full axis of travel.
8.
Proceed with
'System calibration', page
28.
DTi adapter
Readhead
mounting
surface
24
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