This came out of a box of stuff I picked up at an estate. I believe it all goes together in some form or fashion but I have no idea what it's for. It appears to be some sort of indexing device. The casting has no markings on it. The only markings I can find are in the spindle area. The spindle has a Brown & Sharpe number 10 to number 7 adapter and the collet is a Bridgeport Brown & Sharpe number 7 collet. The large gear is a Boston Gear gear.