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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
25
7. Check the readhead set-up LED is green along the full axis of travel.
8. Proceed with
'System calibration'
on page 45.
to 36 for relevant system connection.
DTi adapter
Readhead
mounting
surface
www.renishaw.com
39
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