I have an older industrial sewing machiene table & motor. I need to reverse its direction as it is going the wrong way for my purposes. What wires should I switch ?

May not be(easily) possible.
Do the wires have numbers on them?

What voltage is it running off, real commercial machines normally start at 3 phase, so I doubt you have that motor, so it is most likely one converted for home use.

Is it a 230 vt or a 115 vt motor.

But yes, you can reverse the wires on most of the actual sewing matchine motors, most actually have instructions on the motor

Yes they do have numbers, after I removed the back cover I finally noticed a plate that told me in real small writing which numbers to reverse :) Got it going the right way now! :D Thanks guys ! :)