Originally Posted by
dharmic
How I did it for the rollers in my 2" x 72" belt grinder...
1. A bore in the cylinder as wide as the inner diameter of the bearing outer race, with counterbores in the ends a light press fit with the outer diameter of the bearing outer race - just a step in the ends of the bore that accommodates the bearings.
2. A thrust sleeve between the bearings, about the same size as the inner race.
3. A washer the size of the inner race between the bearing and the channel wall to space it off.
When the bolt's tightened up it can pinch the channel wall, washer, bearing inner race, thrust tube, 2nd bearing inner race, 2nd washer and 2nd channel wall tight and solid, leaving the bearing outers and their press fit into the cylinder to spin but not go anywhere else.
Thrust tube is super important with "normal" ball bearing sets otherwise the axial compression through the washers will flog the races out in no time. Trust me on this. Conical bearings would also solve this but they are super sensitive to how tightly you do up (and keep) the axle bolt.