Drum sander conveyor belt - video

[Toolmaker51]

One thing I didn’t see was how the tension/tracking adjustment worked.

Not perfectly clear. At still title shot, and ~5:06, slots are visible on out-feed end. Looks like pillow blocks bolt on to keys, to ride slots. Such a wide belt area, of three separates, might be tedious. Unlike matched Vee drive belts, sanding belts of same precise length are improbable.