At a speed of 5500 min-1 shaft unbalance controlled on surfaces A and B (pic. 3-53), must not exceed 1.72 N·mm (175 gf mm), and when checking the balancing - 2.16 N·mm (220 gf mm).
Pic. 3-53. Balancing cardan shafts:
1 - washers for balancing; A, B, E, F - unbalance control surfaces; Shaft locking surfaces on a balancing machine.
The balancing of the intermediate cardan shaft is checked at a speed of 800 min-1 on surfaces E and F. Balancing is provided by balancing washers 1 (pic. 3-53) and drilling the hinge body. Unbalance must not exceed 1.96 N·mm (200 gf mm).