Quick & Dirty Jointer Tuning

I have had a 6" Delta Variable-Speed tabletop jointer for several years, and have not had much luck getting straight edges out of it. I tried checking the tables for co-planarity, but my dial indicator was giving me readings all over the place, even on the same table. Shimming the table tops didn't seem feasible when I had nothing to use for a reference.
Yesterday, I bolted the jointer down to a piece of 3/4" MDF and bolted the MDF to the table on my knee mill. I shimmed the MDF to make sure the knife drum was parallel to the mill table and took light cuts with a flycutter to true up both tables. They were both warped, cupped, and bowed. There didn't appear to have been a flat surface anywhere on either table.
After bolting the jointer back on it's stand and re-setting the knife blades, it works much, much better.
Regards, Ed
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