Looking to add a treadmill motor to a JD Wallace vintage bandsaw.

[C-Bag]

Now we can see. Yup, dump the fields(good call PJs on the possible induction into the old coils), dump the flywheel on the dc motor. Looks like the dc motor has a keyway? and the drive pulley is separate from the flywheel? A lot of these treadmill motors aren't.

Like you jere I would use the old dc motor pulley to turn it down to make a bushing/adapter to fit the old gear. So it's gear driven? wow...so it's going be real handy to have the dc motor if you want to do a speed change. Does the drive(motor) gear engage from the bottom to the driven gear or? would be nice to have some kind of adjustment in the motor mount to adjust lash correctly otherwise you're going to get in trouble. I've never seen a gear drive bandsaw but then again I'm no expert. I'd be tempted to just come up with a mount that goes right on the saw that can be adjusted in and out for proper alignment of the drive and driven gears and for lash. Then just put the empty motor can over it after everything is working....just my 2c.