I need to spin a 24 inch round table at about 150 RPM several hours a day.
The motor will drive a belt going around just under the table at a circumference
that allows the slow speed.
What I can't find is a lazy susan or bearing that I can attach under the
spinning table and to the top of my work stand.
Because the motor is driving the table it is also pulling it sideways so a
standard lazy susan bearing might not work as they are designed for force
downward, not sideways.
i built a 24" lap grinder that spins at around 125 rpm under load. i used
the following plans:
http://mrcol.freeyellow.com/grinder/flat_lap_grinder.htm and just scaled
them up for 24". i used 2 pillow blocks and a couple of pulleys to make the
arbor, and 2 flange blocks to support the axle.
chose the pulley sizes to get the speed you want. if you want my spreadsheet
that has the part numbers and places i used, send me an email. remove the
obvious from the address.
Any of the ball bearings types that one normally thinks of are called "deep
They will take a load downward (axial), as well as sideways; usually pretty
substantial in each direction.
Try a company like Bearing Specialties, etc.
Current Dodge truck front hubless designs come to mind. Maybe the 1 ton
model, 2000, 2001 year. Bottom flange ( inboard on the truck ) will
have 4 threaded holes so you can bolt it to something. The top flange (
outboard on the truck, where the rotor and wheel attach ) will have
eight studs. Maybe 5-6" total height. Nice big ol' tapered bearings in
there, too. That'll handle a load!! And guess what? With rim / tire
assembly on the vehicle, it turns out to be almost a 24" diameter if not
more. Put a side force on it all you want, that's how they work in
their designed environment. Multi-directional load.
150rpm is quite fast for 24inch diameter. It's fast enough to need
things fastening down to it.
For a hub, go to a scrapyard and get a car front hub. Something with
a Macpherson strut often allows easy unbolting and re-mounting. A
brake disk can make a base for the table.
Rubber toothed belt drives will easily drive by friction alone onto a
turned cast iron cylinder and a toothed pinion on the small diameter
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