GRW Ball Bearings Misalignment
High precision ball bearings in grades up to ABEC 9 with bores from 1 to 30mm and comparable inch dimensions
General Information
Bearing MISALIGNMENT
The misalignment of a bearing is the degree to which both rings can be titled relatively to each other. The misalignment angle depends on the radial clearance and the internal geometry of the bearing.
Too much misalignment of the rings should always be avoided, as even a small angle of 2’ to 3’ increases the noise level noticeably. Attention must be paid to accurate alignment when designing bearing seats and adjacent surfaces.
Figure 25 shows the free misalignment (without load) depending on radial clearance, for the complete bearing range. Â
Example:
The minimum and maximum possible free misalignment is to be calculated for the ball bearing SS608 C4/8 GPR J:
The basic type 608 is assigned to graph 10 according to table 24. Vertical projection of the radial clearance limits 4 or 8mm gives 2 points of the corresponding graphs (10) which can be transferred to the left on the misalignment scale.
Thus:
The minimum possible free misalignment: βmin ≈ 13 minutes of angle
The maximum possible free misalignment: βmax ≈ 18 minutes of angle Â
Basic Type | Graph | Basic Type | Graph | Basic Type | Graph |
681 | 1 | 695 | 8 | 1016 | 1 |
691 | 2 | 605 | 5 | 1191 | 1 |
68/1.5 | 1 | 625 | 9 | 1397 | 1 |
69/1.5 | 3 | 635 | 10 | 5/64 | 3 |
682 | 3 | 686 | 5 | 2380 | 3 |
692 | 3 | 696 | 6 | 3/32 | 4 |
67/2.35 | 3 | 626 | 10 | 3175 | 4 |
68/2.35 | 3 | 687 | 6 | 1/8A | 4 |
68/2.5 | 3 | 697 | 8 | 1/8B | 6 |
69/2.5 | 4 | 607 | 10 | 3967 | 6 |
60/2.5 | 4 | 627 | 10 | 4763A | 6 |
673 | 4 | 688A | 8 | 4763B | 5 |
683 | 4 | 688 | 8 | 3/16 | 5 |
693 | 4 | 698 | 8 | 6350A | 7 |
623 | 6 | 608 | 10 | 6350B | 5 |
674 | 5 | 689 | 8 | 1/4A | 7 |
684 | 6 | 699 | 9 | 1/4 | 10 |
694 | 7 | 609 | 10 | 7938 | 8 |
604 | 7 | 629 | 10 | 3/8 | 9 |
624 | 6 | 6800 | 9 | Â | Â |
634 | 9 | 6900 | 9 | Â | Â |
675 | 6 | 6000 | 10 | Â | Â |
685 | 7 | Â | Â | Â | Â |
Table 24: Assignment of the graphs for calculating the misalignment
