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If the larger opening between coupling faces is at the top, place .072 in. of shim under each
rear foot or remove .072 in. from the front footings to bring the couplings into angular alignment
in elevation.
Tighten the holddown bolts and recheck the net misalignment.
The height of the shaft above the footings and the distance the shaft extends beyond the
equipment will not affect the calculations.
Determine the angular adjustment in plan by the same method of calculation. At this point,
however, the procedure should include a correction for the change in coupling gap which
always occurs in adjusting angular alignment. By selecting the proper pivot point (see
Figure 40), the coupling gap can be kept at the dimension specified in the job data.
1. Pivot on the front bolt at the closed side of the couplings to shorten the gap; pivot on the
front bolt at the open side to lengthen it. It may sometimes be advantageous to pivot half the
required amount on one front footing and half on the other.
2. Place a dial indicator against the rear foot as indicated in Figure 41.
3. Place a screw jack on the other rear foot to move the equipment towards the indicator.
4. Loosen all holddown bolts except the pivot bolt. Turn the screw jack until the rear end of the
equipment moves against the indicator by the desired amount.