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RPI re-launch the i72 Angle Reference Standard
Monday, November 14th, 2011
The i72 Angle reference standard is now available to all Laser Interferometer and Autocollimator manufacturers, calibration laboratories, and rotary axis OEM’s
The i72 is a compact high accuracy positioning system for use [...]
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QD12-08-C – Parallelism
To determine the deviation in parallelism of a point on the rotary surface and the bottom (seating) surface of the rotary table.
Parallelism error is defined as the height difference fp between 2 planes parallel to the seating surface within which all measured points must be.
The rotary table assembly and a high-resolution linear probe and stand are placed on a granite surface plate. The probe is positioned on the top at a diameter position of approximately 0.9 x diameter and zeroed. The stand and probe are not moved but the complete rotary table is slid on the granite and re-positioned where the probe is now at a position approximately 90° from the original on the table top. The table top is rotated 90° in the reverse direction to the base movement. The dial indicator reading is noted and the process repeated at 180°, 270° and 360° positions.
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QD12-08-C |
