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Readhead mounting and alignment:
There is a range of tools available to assist with readhead installation depending upon the system design:
Shim kit.
u
Dummy head.
u
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.
Do not saturate the readhead window with cleaning solvent as this may cause contamination on the inside
of the readhead window which then cannot be cleaned.
IMPORTANT: Whichever method is used to mount the readhead, care should be taken to ensure the disc
surface is not damaged during this operation.
NOTE: Cabled readhead shown but the same readhead mounting and alignment methods are applicable for
top exit readheads.
Shim kit
(A-9401-0050)
This method is intended
for applications where the
rideheight of the readhead
cannot be adjusted.
Location pins
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 of 2.5 mm (±0.2 mm).
The kit consists of:
A-9401-
A-9401-
Part number:
0041
0042
Thickness
20
40
(µm)
Quantity in
10
10
pack
1
Using a digital dial gauge or similar measure the distance from the readhead mounting surface to the
disc surface. Care must be taken to ensure the disc surface is not scratched.
Renishaw offer a DTI adapter (A-9401-0105) that can be used to assist with this process.
Insert the gauge into the adapter and zero the gauge on a flat surface.
u
Position or fix the gauge/adapter in place of the readhead and measure the distance to the disc surface.
u
Contact your local Renishaw representative for details of the DTI adapter and digital dial guage.
ATOM DX
rotary installation guide
Methods
The system should be
designed to achieve a
nominal 2.3 mm (±0.2 mm)
from the readhead mounting
2.3 ±0.2 mm
surface to the disc surface.
A-9401-
A-9401-
A-9401-
A-9401-
0043
0044
0045
0046
60
80
100
200
10
10
20
20
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 2 off
M2 × 6 screws in diagonally opposite fixing holes
ensuring that the readhead is tightened down evenly
and parallel to the bracket face.
6
Connect the readhead to the receiving electronics
and power-up.
Using location pins / shoulder:
7
Ensure the readhead is pushed back against
the location pins or shoulder.
8
Tighten the readhead fixing screws.
9
Check the readhead set-up LED is flashing
Green around the full axis of rotation.
10 Proceed with 'System calibration' section
Not using location pins:
A-9401-
11 Adjust longitudinal and radial offset of the
0047
readhead to obtain a flashing Green
readhead set-up LED around the full
300
axis of rotation. An oscilloscope or
Advanced Diagnostic Tool (ADTi-100) and
10
ADT View software can be used to help
maximise the signal size. *
12 Tighten the readhead fixing screws.
13 Proceed with 'System calibration' section
*
For more details refer to the 'Advanced Diagnostic Tool ADTi-100 and ADT View software quick start guide' (M-6195-9321)
and 'Advanced Diagnostic Tool ADTi-100 and ADT View software user guide' (M-6195-9413).
(see page
12).
(see page
12).
DTI adapter
RCDM
disc
9
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