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Originally Posted by ali_rockon22
For bearings in a gearbox I suggest flanged bearings. In anything else regular ball bearings will work.
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Not to let you get confused, flanged bearings may be ball bearings. We use flanged ball bearings in our drive modules. It allows one to contruct a transmission where there is relatively low side loads on the shafts and keep everything in alignment. If you turn the shaft down to the ID of the bearing and leave a shoulder on the shaft, then the bearing will not move in on the shaft. The two side walls of the enclosure then have the bearings pressed into place from the inside. When you assemble the walls the flange on the bearing will prevent the bearing from moving out and the shoulder on the shaft prevents the bearing from moving in. That way all parts remain in alignment and nothing falls apart and no shafts pull out of the bearings.