IMHO this is a much better piece of machinery than you could buy now brand new.
Jointers aren't really complicated machines, if it functions at all, motor and cutter-head turn, surface wood, even with chipped knives I'd buy it in a heartbeat.
If the bed is rusty, this can easily be fixed, but if the bed is rusty, then look carefully at the head and especially the screws with lock/adjust the height of the knives. If these are rusted you may have a devil of a time getting these out.
As others have said, does it run. Before you turn it on, try and rotate the motor/belt just in case the motor or a bearing has seized. Easier to fix if not scored.
Can both the beds be adjusted to be parallel. Some models can adjust only e.g., infeed bed for parallel. Better if both can be adjusted.
Is the fence square against the bed. Take your OWN square which you know to be good. I have a Delta 39-170 and I did not realise for some time that the bed was square, but I only checked the front and foolishly assumed the back was square. Not the case. I was able to fix, but I had been wondering why my pieces were coming out with a twist.
Any cracks in the beds or fence. Can be welded, but a lot of effort.
What is the voltage? Do you have 120 and 240V available?
What is the feed - single phase. Worth asking, a recent thread had a person who purchased a 1/2HP 3 phase motor. We never did find out if he really needed 3 phase, but the thread was about the motor not starting. Check the nameplate on the motor to confirm size/voltage and no. of phases.
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