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Author Topic: Designing a rotating platform / turntable.  (Read 8231 times)

Bajdi

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Designing a rotating platform / turntable.
« on: November 03, 2015, 03:54:32 PM »
I take a lot of photos of my (small) electronics projects. For a while I've been thinking about designing a mini studio. I would like to rotate the platform with a stepper motor (small one or a NEMA17). I don't want to attach the platform directly to the motor. So I need to come up with a way to mount the platform to a base so it can turn smoothly. Anyone have any ideas/examples? I want to keep things simple and use 3D printed parts for everything if possible. I do have some spare bearings from my 3D printer built. Is bolting 4 small bearings to the underside of the platform an idea?

ossipee

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Re: Designing a rotating platform / turntable.
« Reply #1 on: November 03, 2015, 04:33:17 PM »
How about a lazy susan bearing they come in lots of shapers and size, and are mostly rated by weight
http://www.amazon.com/Susan-Bearings-Thick-200-lb-Capacity/dp/B0006LBVDI

Then use a belt or gear on stepper to drive the gear or pulley into the printed top, like on your old turntable for lp's

Protowrxs

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Re: Designing a rotating platform / turntable - 3D Scanner Objects?
« Reply #2 on: November 03, 2015, 05:42:05 PM »
Hey Bajdi,

Have you checked out any of the printable 3D scanners out there? They have little turn tables for turn the scanned object.

I printed this one out but never messed with the software, etc. Ended up turning it up on it's side and making a "watch winder" for my son and his old time self winding watch.

Just an idea...

Some examples:
http://www.thingiverse.com/thing:702470
http://www.thingiverse.com/thing:159981
http://www.thingiverse.com/thing:740357

Stephen
The past is done, the future is not here, live today...
My Bots: http://www.Protowrxs.com/robotics

Bajdi

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Re: Designing a rotating platform / turntable.
« Reply #3 on: November 05, 2015, 02:55:52 PM »
The lazy susan is a nice option. But will need to order one from China.

I've looked at a dozen designs on Thingiverse but haven't found one that I liked.

Bajdi

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Re: Designing a rotating platform / turntable.
« Reply #4 on: November 05, 2015, 03:17:55 PM »
Finally found a design I like on Thingiverse (their search function s*cks): http://www.thingiverse.com/thing:96047
Going to redesign it in Freecad so it fits the bearings/stepper I have in stock.

erco

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Re: Designing a rotating platform / turntable.
« Reply #5 on: November 06, 2015, 10:34:28 PM »
How big a turntable and how heavy will the objects rotated be? Perfect job for a CR servo. I'd just glue the case of a metal gear/shaft CR servo under a disk and be done with it. Shaft sticks down into the base. Batteries, circuit & servo all rotate continuously with the turntable. You could do IR remote control easily or even just install a dollar servo tester underneath.

Heck, I'll make one of these to jazz up my Youtube vids a bit. Shouldn't take more than an hour to build.

Bajdi

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Re: Designing a rotating platform / turntable.
« Reply #6 on: November 07, 2015, 05:23:24 AM »
I don't have any continuous rotation servos in stock, could mod a regular servo but I don't like that. I have a large stock of stepper motors. Have a dozen small ones and a dozen NEMA17's. I designed a turntable + base in freecad last night. It's 170mm diameter, looking at 8-10 hours printing time for all the parts.

jinx

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Re: Designing a rotating platform / turntable.
« Reply #7 on: November 07, 2015, 03:58:04 PM »
i be tempted to use something like this http://tinyurl.com/pyhrdnf
I build bots

erco

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Re: Designing a rotating platform / turntable.
« Reply #8 on: November 08, 2015, 03:09:59 AM »
I don't have any continuous rotation servos in stock, could mod a regular servo but I don't like that.

I bought two pairs of these CR servos, about as cheap as I've found at $8 each. Have not built them into a bot yet, but they seem pretty good in bench tests. Not metal gear/shaft BTW. NY seller, quick & free ship.

http://www.ebay.com/itm/2x-Spring-RC-SM-S4303R-Robot-Servo-360-Degree-Rotation-Plastic-Black-for-Robot/321764243706

http://www.ebay.com/itm/2x-Spring-RC-SM-S4306R-Continuous-Rotation-Robot-Servo-15KG-360-degree-for-Robot-/231595074848

Bajdi

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Re: Designing a rotating platform / turntable.
« Reply #9 on: November 25, 2015, 04:04:36 PM »
I finally designed a turntable in Freecad and printed it on my P3steel. It's made out of 3 parts. Base, table and a little coupling to attach the motor to the table. I'm using a small 24byj48 stepper motor. The table runs on 4 small bearings I had laying around.



For the first test I put my Poppet on it:


Protowrxs

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Re: Designing a rotating platform / turntable.
« Reply #10 on: November 25, 2015, 05:09:36 PM »
That's really nice Bajdi - simple but very functional. Good job.

Stephen
The past is done, the future is not here, live today...
My Bots: http://www.Protowrxs.com/robotics

 

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