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Step 3
Mounting
Adjust ring position until the
DTI (dial test indicator) reading
at these points agrees to 10 µm.
'Slot' fiducial
Mounting
Step 4
Now adjust the ring position until the
DTI (dial test indicator) reading
at these points agrees to 10 µm.
'Dimple' fiducial
Mounting
Step 5
u
Re-check the run-out at the two 'slot' fiducial points, to ensure the run-out at the two 'slot' points is
still within 10 µm. Adjust if necessary.
u
Gradually tighten the 4 screws, a quarter-turn at a time so as to avoid moving the position of the
ring. Finally, insert the remaining M5 screws and torque all the screws to 4 Nm.
u
Re-check the run-out at the two 'slot' fiducial points, then at the two 'dimple' fiducial points.
The run-out values at the 'slot' fiducial points do not have to match the run-out values at the 'dimple'
fiducial points. If the ring has moved position outside the 10 µm limit, the screws must be loosened
and the ring adjusted.
'Slot' fiducial
'Dimple' fiducial
Alternative method -using adjustment screws
It is essential that 4 adjustment screws are used, aligned to the 4 fiducial points (indicated by a 'slot' or
'dimple' mark machined into the front face of the ring).
IMPORTANT: To achieve the highest accuracy, the ring must not be distorted. When adjusting the ring
position using adjustment screws, always work in opposing pairs, loosening one screw before tightening
the other. Once the ring has been set to 10 µm in one plane, loosen both those adjustment screws before
adjusting the other plane.
For ease of adjustment, 4 off M5 screws with washers should be inserted into the ring
and tightened finger-tight. These mounting screws should be fitted in the bolt holes aligned to the
4 fiducial marks.
Take run-out measurements at the opposing fiducial points and centre the ring in that plane to within
10 µm. Next, centre the ring in the other direction to within 10 µm in the same way. Note that the run-out at
the 'slots' does not have to equal the run-out at the 'dimples'. Finally, re-check the original plane.
Note that 52 mm and 57 mm rings have dimple marks only, so select diametrically opposed dimples
as adjustment points.
Once the ring is set in both planes fit the remaining M5 screws and torque to 4 Nm.
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