Heavy Duty Lazy Susan for Full Body Scanning
Description
Ever since discovering ReconstructMe, I've been looking for a suitable turntable setup for creating full body scans of people. Most of the plans out there are for tabletop photo or scanning setups that won't handle a lot of weight.
Lo and behold, I found these plans cheesycam.com/motorized-lazy-susan-heavy-duty/, for using the
front wheel hub assembly from a car as the rotation bearing and an electric drill to power turning it. My implementation can be built for around $100.
This device is the centerpiece of my Coney Island Scan-A-Rama Project- a next generation photo booth in which subjects are scanned and printed.
Update 10/16/2012
I have added a 12volt 4RPM high torque rotisserie motor with a 3D printed pulley driving a bicycle inner tube belt drive. I just uploaded images of the motor (got it on ebay), the updated assembly, as well as source files for my pulley print, with slots for a set screw and nut.
Instructions
-Front Hub Assembly from car (~$30 on Ebay)
-2x 28" plywood circles (top plates)
-1x 12" plywood circle (Inner part for belt drive pulley)
-1x 14" plywood circle (outer part for belt drive pulley)
-1x 28" plywood square (base)
-10" plywood square
-some 2x4 and plywood scraps
-6x 3 1/2" x 3/8" carriage bolts
-3x 3"x 1/2" lag bolts
-Fender washers
-old bike tire tubes for the belt to power the turntable
-12 volt 4 RPM high torque rotisserie motor
-hose clamps
Steps:
1) Using a router or jigsaw, cut out the circles from a sheet of 3/4" plywood.
2) Next, cut inner circles out of the center of both squares and the 12 and 14" circles. This gives a place for the center of the hub assembly to recess into so that it can be bolted onto the plywood.
3) After placing the hub, mark the wood and drill holes for the bolts.
4) Bolt the hub to the base. Add 2x4 blocks to the corners of the base as feet.
5) Bolt the top turntable to the top of the hub. The order the circles stack is 14", 12", 28" 28". This creates a pulley to power turning the platform and a double layer of plywood on top for people to stand on.
6) Mount the rotisserie motor with the printed gear on a 2x4. Put the bike tube around the pulley under the turntable, and stretch it around the pulley on the motor. Screw the 2x4 to the base so that the belt is stretched tight.
Now get someone to stand on it, fire up ReconstructMe, and start scanning with the human highres setting!
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I've considered making one of these before, but my problem with moving a person around is they might stumble. Wouldn't it be a better idea to keep them stationary and move the camera around them?
Awesome project!!
This should drastically reduce the price:
http://www.mcmaster.com/#6031K...
It's a turntable that you can buy from McMaster Carr for about $4. It's got a 500 lb max capacity, so it should all but the heaviest of subjects!
You may also be able to do away with the pulley system by using a rubber wh
eel on the shaft of a motor like one of these:
http://www.ebay.com/sch/i.html...
Just orient the motor vertically, and put the wheel in direct contact with the edge of the turntable platform!
I've used the lazy-susan type bearings similar to the McMaster link you provided. I can attest that standing on it can result in some clunky movements if the weight is not evenly distributed. However, in my applications, the objects were large, but not heavy and the bearings worked great. Picked them up from Home Depot for about $10.
I looked at these bearings at McMaster-Carr but in my past experience with these bearings, if the weight is unevenly distributed they will not spin well. With the larger platform size IMHO, I don't think this will work well, but I'd love to be proven wrong.
If you watch the video http://cheesycam.com/motorized... , you'll see that the larger pulley underneath makes it a lot easier to spin, as opposed to a motor attached directly to the shaft. The rubber wheel approach could be good as well. I'm thinking a stepper motor with a pull
ey may be the easiest implementation, as opposed to having to mount the motor under the platform.
one cheap motor alternative.
get a motor from a rotisserie (i see these at garage sales a bit)
they have low rpm and High torque and usually are powered from AC outlet.
I have two thoughts about where to go with the motor:
1) Stepper motor with a pulley. Once the table is turned on, this should just start the table slowly turning so the scanner could start at the bottom and work their way up the subject.
2) I was thinking about a sewing machine motor and a foot pedal. I think that a foot pedal would be a good cont
rol for the person scanning to be able to rotate the table, but maybe a continuous turn would be easier so the scanner person doesn't have to do too much at once.
So far I think #1 is the way to go. I'm curious about trying one of those rotisserie motors- that could be good if there are speed cont
rols for those.
License
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Really kool dude. I am kinda interested in your reconstructme software as well. Do you find it easy to use?
Since I'm a Mac guy, it was a pain to get Windows installed under boot camp and get AT
&
amp;T the right drivers to run ReMe, but after that's over it's pretty easy going.