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.
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.
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.
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
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.
On Thu, 07 Apr 2005 11:14:45 -0700, the inscrutable Jack R
Look for a tapered roller bearing. They're built to handle both axial
and radial loads in pre-loaded pairs. An auto axle and housing could
be cut down for your purposes. That would give you a fairly large
flange which had already been ground for a flat surface.
Sounds like you're making a potter's wheel.
Vidi, Vici, Veni
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