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All tests should have the ball screw assembly located in the test fixtures as shown in Figure above.
Select (4) gauge pins such that the diameter of each pin matches the nominal ball diameter for the assembly. Position the pins on the V-blocks, and then position the ball screw on the pins.
Place the bearing ball at the end of the screw, between a right angle bracket and the ball screw. (NOTE: The right angle bracket must be clamped down or positioned against secure object to prevent movement.)
a. Shoulder Perpendicularity Test Place the dial indicator on the shoulder of the screw (See figure above) and rotate the ball screw so that the pins rotate back and forth on the V-block and observe the dial indicator. Record the greatest deviation as indicated by the dial movement.
b. Concentricity Test Place the dial indicator on an end journal (See figure above) and rotate the ball screw. Record the total indicator reading (TIR). Reposition the dial indicator as necessary to measure deviation across the entire length of the screw journal and record the greatest deviation indicated by the dial movement.
c. Flange Perpendicularity Place the dial indicator on each of the flange mounting surfaces (See figure above) and rotate the ball screw. Record the greatest deviation as indicated by the dial movement.
d. Straightness Test Install the flat tip assembly to the dial indicator (See figure above) and position on the screw at the far left of the assembly. Rotate the ball screw and record the greatest deviation as indicated by the dial movement. Repeat this measurement at the center and far right of the screw.