I found this sander on Creaglist a few weeks ago—-
Old state spindle sander, 3 phase, needs repair (bearings?) $300.00
I have been looking for an oscillating spindle sander but I didn’t want one from the big box stores. This one fit the bill but not running and it has a 3 phase motor. Not to good… My thought was to replace the motor, I don’t have 3 phase power in shop anyway. So once I got it all tore down I found that just need cleaned out and new oil added to the gear chamber. That was the good news. The bad news was there was no way to replace the motor. The top of the motor housing was the bottom of the gear chamber, it was one large tube. I have always avoided buying tools with 3 phase power because It was costly to by a phase converter and I. Have very little knowledge about that stuff. After a little head scratching and a little Googling I found a post on vintagemachinery.org That had the same sander but it had an motor mounted on the side of the base. From the picture I could tell this was added to this machine. So I removed the windings from the inside of the motor, that made just enough room to add a 1” pulley inside the motor. Then I cut an opening in the side of the motor to make room for a belt. Next I had to weld up a bracket to hold the new 110 1/2 hp motor. I have to say I had my doubts put it works great.
-- Gray hair is a crown of splendor; it is attained by a righteous life. Proverbs 16:31