I do not see an adjustment for the bed. Altering one of the corner's position on the threaded rod would cause binding. This makes me think that the head, or more likely knives, are adjusted to bring things into alignment. What you are after is when the knife passes BDC (bottom dead center; do you use that term over there?) the distance between anywhere on the knife edge and the platen is consistent. A Rotocator is helpful but, rather than send $100 I just cobbled this together from items I already had.
I notice that quite awhile after this Rockler came out with a commercial version. I assume this is just a coincidence. Like any tool alignment effort, patience is your friend. Time spent making careful settings, checking and rechecking will pay big dividends going forward.
Last edited by glenn bradley; 04-10-2016 at 02:34 PM.
Any sufficiently advanced technology is indistinguishable from magic.
- Arthur C. Clarke