4
The Index Module
There is a removable index module (see Figure 5) mounted on the target
to aid in the indexing of the target at 0 and 180 degrees. The procedure
of indexing the target at 0 and 180 degrees is done when the target is
used to check the alignment of an axis of rotation and the alignment of a
bore. The module can be loosened and positioned in any orientation or
removed from the target when it is not needed.
To use the Index Module, rotate the target so that the bubble level is
showing “level,” then take a reading. Rotate the target 180 degrees, re-
level the target and take a reading.
Mounting Error Calculation
All T-212 targets are shipped with the target PSD aligned to the housing within .0005 in. TIR. In time,
handling may cause the target cell to become out of center. To remove centering and fixture errors, use
the NORMIN method of taking a normal reading, rotating the target 180 degrees and taking another
reading, and splitting the difference between the two (see The NORMIN Procedure beginning on Page 5).
This is done for the center values and angular values separately.
Figure 6 –
T-212 with Index Module
Summary of Contents for T-212
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