Mark:
No offense taken (Michigan vs. Minnesota comment).
I don't know what speed the motor spins at. I have a Jet contractors table saw wired for 115 volt, so I suspect it spins at 1725.
My sander is an adaptation of the design shown in ShopNotes a while back with some modifications.
I used a 1 inch diameter shaft because I followed some comments from builders on another web site that they were having facetting problems with their MDF drums and associated the problem with a bent shaft or table flexing. To be safe, I went for a large diameter shaft. I got the shaft and pulleys from McMaster-Carr (
www.mcmaster.com). The shaft was a bit pricey but it has worked well. I got my pillow blocks from Reid Supply (
www.reidsupply.com)
I used a 2 inch diameter pulley with a 5/8 bore on the saw, and just attached it with the standard saw blade nut. The pulleys on my drum are 5 inch diameter with 1 inch bore. I put pulleys on both ends of the shaft in case I add a dedicated motor in the future and don't know which way it will spin (having seen peoples struggles to re-wire their motor to reverse the direction of spin).
Part of the reason I went big on the shaft is I built a 20 inch wide drum on my sander so I could also sand big guitar tops with the same sander. My plans are to return to guitar making after having fun with building ukuleles for a while. The drum is 5 inches in diameter and is locked to the shaft by 1/8 inch pins through the shaft near each end. Behind each end disk is a MDF disk with a slot to trap the locking pin. The last two disks are attached with drywall screws so they can be removed if needed. The main drum disks are glued together with titebond glue.
If you look at the ShopNotes plans, you will see a nice belt feed conveyor system. I decided against this because it added flex in the table support for the work.
If I can be of any more help, let me know.
Don