Is a level necessar or will any atraightedge do?
wrote:
stryped wrote:
Do you remember how you adjusted it to get coplaner?

Not in detail, only that I must have taken that outfeed table on and
off about a dozen times and I used a four-foot level. There's an
article on adjusting old jointer tables on the OWWT website and that's
what I used for a guide. It's been a few years now since I did that and
I'm at the point where my brain makes room for new stuff by dumping
other stuff.

Were you able to
do glue ups with it without other work to the board?

For short boards - about two feet or so - yeah. Made pretty good edges.
Longer boards tended to exagerate the original problem; if there was a
little bit of cup in the edge, there was more cup in it after it ran
through. You can minimize that, and I've heard some guys know how to
make a short bed jointer joint a long board, but I needed a jointer
plane to get rid of it.

I am wondering if I could use automotive rubbing compound and a buffer
to clean up the table. (Or will this make the table not flat anymore?)

Take a few hours wandering around the old woodworking tools website.
They've got tons of information on using sandpaper etc to clean rust
off old tables, how good is good enough, and answers to other questions
you haven't thought of yet. Much more info that you'll get here because
they've been cataloging, categorizing it, and storing it for so long.