Ball bearings are the most common type of bearing and are often found in AEG internals. They use small metal balls as the rollers. When the load is transmitted from the outer race to the balls (and then from the ball to the inner race), the balls only contact the inner and outer race at very small points, meaning there isn’t much contact area holding the load. When the bearings are overloaded, the balls can deform or squish. The smaller the balls, the weaker they are.
If you are to stay within a FPS of 320 or so it is recommended that you use ball bearings rather than metal bushings (ball bearings are more energy friendly). If you will go over this power limit, there are 2 recommended solutions:
- use 6mm metal bushings, which would last very long and would cost less to setup.
- use 7mm (or even 8mm) ball bearings – you’ll need to enlarge the bushing holders on the shell to accommodate 7mm ball bearings (the use of dremel tool would therefore be required –enlarging the holes from 6mm to 7mm is nothing technically sophisticated but you just have to practice a lot and be careful not to over dremel).
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