SHAFT ALIGNMENT - FLEX ELEMENT ALIGNMENT PROCEDURE
- When the distance between coupling flex elements is long, making use of indicator brackets impractical or where lasers cannot be targeted due to obstructions or beam interference, Across the Flex Element Alignment method can be used.
In this method, angular and axial misalignment will be checked as described below respectively:
Angular alignment:
Step 1: Squarely and firmly attach a dial indicator to the center member shaft and read across the flex element to the driver hub surface facing away from the indicator mounting as seen in Fig. 16.
Step 2: With the dial indicator set to zero, rotate the shaft one revolution and record the maximum and minimum dial indicator readings.
Step 3: If the range between the maximum and minimum reading is at or below .010 inch, the angular alignment is acceptable. If the range is greater than .010 inch, the equipment should be realigned.
Step 4: Repeat steps 1-4 on the driven side flex element.
Axial Alignment:
- To establish the axial misalignment, you will measure the gap between the spacer flange and connected equipment hubs, on both flex points of the coupling, and compare with published coupling limits.
Step 1: Without rotating the coupling, take four gap readings at 3:00, 6:00, 9:00 and 12:00 o’clock between the driver and center member flanges as seen in Fig. 17.
Step 2: Average these four readings.
Step 3: Consult the coupling installation instructions for the coupling size and style being installed to be sure the average reading are within acceptable axial installation limits. If the coupling being aligned is an Addax® coupling, the nominal gap for all sizes is .540 inches and should be between .530 and .550 inches.
Step 4: Repeat steps 1-3 on the driven side flex element.
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