Heavy Duty Lazy Susan for Full Body Scanning
by fredini, published
Coney Island Scan-A-Rama:
A 3D scanning turntable capable of supporting the weight of a human being. 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 http://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.
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.
Added a new pulley in two parts that can be printed on a Replicator build platform, then glued afterwards. Drill afterwards to use a setscrew through a bolt in the slot against the flattened part of the motor shaft.
I have also added a foot pedal to apply power to the turntable motor. However, I am seeking advice for a braking mechanism for the wheel when power is not applied. I was thinking a solenoid or something that could retract as power is on. I have safety concerns for the wheel spinning as people climb on or off the wheel. Any thoughts on this are appreciated.
I added some images of the brake assembly. This will be the last update to this thing as this design is deprecated. I hope to post the designs for my 2.0 turntable design soon. The new design uses a worm gear motor and chain driving a sprocket to rotate the wheel, making for easier mounting and dismounting of the scanning subject.
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See the Make Magazine build instructions here:
-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
-old bike tire tubes for the belt to power the turntable
-12 volt 4 RPM high torque rotisserie motor
- Foot Switch (such as http://www.harborfreight.com/power-maintained-foot-switch-96618.html)
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!