Ok, Need some help.
Friend bought a statue. It's about 12" in diameter and 24" tall. (Haven't
seen it yet) She has asked me to build a pedestal. Ok, that should be kind
of fun.. the kicker is, she wants it to TURN, slowly with an electric motor.
(SWMBO actually didn't immediately say NO when I suggested the pedestal
would have to be round, thus requiring the purchase of a lathe!!)
Round or Square or Otherwise. How do I make it turn? This infrastructure
will dictate the final form I suspect. Suggestions? Websites? Sympathetic
try the following link:
go to the second listing... for robot motor $10 well spent..
FWIW..... BG Micro has been this "gadget guy's" favorite place for
several years.... You will need a "wall wart" to power the robot
motor, but they can be had for $2-3...
On Thu, 07 Aug 2003 05:00:04 GMT, "Patrick Fischer"
On Thu, 07 Aug 2003 04:57:29 GMT, "Patrick Fischer"
You never build this sort of thing - buy it ready-made instead. Find
the right sort of scrapyard (big industrial machinery, scrap aircraft,
whatever), and start looking for something that's already a pedestal,
it just doesn't know it yet. Then you dress it with a casing over it.
Friend of mine has a swivel chair made from an ejector seat. The
swivel for that is an old front hub from a Saab (front wheel drive is
The advantage of a car hub is that you need to make a fairly tall
pedestal and have it stable. This either needs a long axle with a
bearing at top and bottom, or something very rigid mounted low down.
The wheel hub is easy and cheap to get, and rigid enough. You'll also
need plenty of ballast to stop it being knocked over, and the hub
would help there.
To power it, I'd use a chain drive, with a motor mounted off to one
side. Large chain sprockets with hollow centres come from pushbikes,
small sprockets are cheaply bought, with centres to fit standard motor
shafts. Chain pitch is pretty standard.
The motors I'd use (as I have them to hand already) are geared
synchronous motors that used to be in a coffee vending machine. One is
driving the bellows in the organ doorbell project:
Chains are pretty quiet at low speeds. They get noisy when they run
fast and the chain starts to slap back and forth.
If you're worried about noise, then use a flat toothed belt. The drive
sprocket is easy to get (many of my motors came from old photocopiers,
and they nearly all have one already). For low torques, you don;t
need to tooth the large diameter pulley, just turn a smooth wooden
surface and use friction.
I use one to spin a 5-gallon bucket to polish pistol brass cases, it
works fine, but it's LOUD. I think it wouldn't be conducive to
meditation of artistic interpretation...unless the viewer can
appreciate the contrast of the industrial audio component of the
display with the visual sensuousness, or something like that.
Please remove the spamtrap to email me.
Good morning Pat,
Sounds like an interesting problem. Here's my take:
Using a lazy susan bearing (also used for television swivels) (1) and an
appropriately sized disk to hold the artwork. Rotation provided by a small
gearhead motor (2) connected to the center of the upper disk (install a
tee-nut from the top, and connect to the turntable with a piece of
all-thread and a jam nut. File a flat on the bottom end of the all-thread
and use a shaft coupling to connect to the gearmotor. Provide ventilation
for the gearmotor (might even put in a small fan if temperature rises too
much). Oh ... you'll need to drill a small hole for the all-thread to rise
through the top of the base. Gearmotor mounts to shelf inside base, if you
leave the back open you can gain access and eliminate the cooling fan idea
(may want to make a face frame to help keep things rigid). Fun part, you can
probably make the entire thing from solid-surface (Corian) countertop
material to compliment the artwork if you don't want to work with wood. Of
course, you can always make the base from plywood and apply the veneer of
(1) Available at Woodcraft, Rocklers and other mail order suppliers as well
as some of your local woodworking stores
(2) Available from various electronics surplus houses such as BG Micro (as
someone else already reported), All Electronics, Electronics Goldmine,
American Science and Surplus, and so forth. You'll probably want a 110 VAC
gearmotor (which will drop the cost because the robotics crowd won't bother
"Patrick Fischer" wrote
There are many ways to make something go round and round... I suspect
the tricky part will be finding something QUIET that does the job.
Presumably a motor will be involved mounting it on a cushion of some
sort might be useful so your pedestal doesn't become one big sounding
board. Of course, you could in theory figure out the resonant
frequencies of the pedestal and make them mis-match with the motor. :)
Wish I could have been of help in a more concrete fashion ....
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