I am going to manufacture a simple wheel for my 3/4 horsepower 2 pole (3600 RPM) ODP pump motor. Unlike the typical 5/8" keyed shaft, this motor has a 1/2" NF (National Fine thread) shaft where the pump impeller was screwed on. A bolt welded on to a 1/2" NF nut may work to my advantage here and the right-hand thread tightens the nut with the CCW direction of the motor.
I'd like the drive wheel to be 2-1/4" wide and three pieces of 3/4" medium density fiberboard (MDF) will stack up to this. The diameter will be 3.82" and the unloaded belt will run at 3600 surface feet per minute, which is a good speed for a broad range of belts and applications.
With a few washers and nuts and tightened the discs together. Expect some glue to ooze out.
Now with the clamps I gave the block a squeeze and let sit overnight.
I mounted the wheel on the motor and used a chisel to true the face. Resting the chisel against the edge of the workbench.
Some black paint and we're good to go.
Here's a video I made that shows the construction of the wheel.
OK, so your motor has a different shaft? There are some inexpensive products that can make your life easier.
This is tapered bushing. They come in common shaft sizes like 1/2", 5/8" and 3/4" for usually under $10. With this bushing you can fit any just about diameter of wooden wheel you want to make to your motor shaft.
I have another smaller motor with a 1/2" shaft with a flat for a set screw on it. With some 3/4" DOM tube (which has a 1/2" inside diameter) and a 1/2" large flat washer I made a kind of bushing suitable for the little motor's 1/2" horsepower capacity.
This part can now be fitted to any diameter of drive wheel you want to make.
I am working on a 6" wheel for a four pole motor. I'll post some photos when it's done.