3D Printing My Own Personal Robot Servant

Well, as you can see, I've started with the arm.  This puppy has reduction gears, driven by a stepper motor.  I'm planning to power the forearm with metal gear servos. Of course with slight modifications to the segment ratios, this is also going to be the legs of my robot.

I need more steppers and drivers, which are on order.  This prototype is a result of several months of work, and almost 3 kg of plastic was used, in trial and error, before this stage has been reached.

Right now, all points of rotation are fitted with plastic printed bearings, but I've got some steel 26x17x5mm bearings coming from China.  Not sure if they will be needed, since everything runs rather smoothly with the plastic bearings.  Just some grease would make things run like silk.

Maybe it will help me clean up my room.

By request of Dany here's a video of it being run off my TOM's motor controller.  Excuse the scruffy attire and lack of grooming. ;-)

Views: 1575

Comment by Dave Wicks on January 10, 2013 at 12:15am
Awesome! Can't wait to see the progress!
Comment by R. D. Starwalt on January 10, 2013 at 5:25am

How nice Ellison! Thank you for sharing the project.

Now clean up your room....wait...don't look in my shop.


Comment by Maxime Carrier on January 10, 2013 at 10:34am

On your photo that looks like an exoskeleton !

Comment by Ellison Chan on January 10, 2013 at 11:37am

Hey Maxime, it's very painful to were it as an exoskeleton.  ;-)

Beside the Nema 17 steppers have very little torque.  I'm using 8:1 reduction to get enough torque so that the motors can move the arm. I'm happy if it can move itself, let alone me.

Comment by Diederik Geurtsen on January 10, 2013 at 11:48am

Very nice!
What 3D printer are you using?

Comment by Ellison Chan on January 10, 2013 at 11:53am

Hey Diederik, it's a Thing-O-Matic, from MakerBot.

Comment by Scott Berfield on January 10, 2013 at 4:47pm

I assume you have a source for plastic in bulk!

Comment by Ellison Chan on January 10, 2013 at 5:19pm

I found a Canadian supplier which sells the purple stuff @ $29/kg.  Guess it's not a popular colour.

I'm going to order from a China supplier in bulk, who's selling it for $18/kg.

Comment by Dany Thivierge on January 10, 2013 at 8:47pm

Ellison, you know us.... we need VIDEO!! :) 

Comment by Ellison Chan on January 10, 2013 at 10:21pm

Dany, you asked for it, you got it. Added above.


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