This sliding block was designed as a part of an assembly process assisting equipment i used in my factory.
I weld the whole structure but this is not a required. Since i have large off the axis load i added two plates to provide extra rigidity and solid attachment points. Those two plates if used must to be welded.
It use a 6200 deep groove ball bearing, ID-10, OD-30, W-9. To adapt for a different size you need to adjust the holes center to center distance.
Since this block is designed to be used with a 2" square pipe that come with a large tolerances preloading or bearing adjustment is not designed and not required.
The slide block is intended to be used in not critical application where a large off the vertical axis load may cause significant torque momentums on X and Y axis.
To safe some time i do not design any spacer but use a shim washers to keep the proper distance between the bearings.