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Drawings and/or photos of your existing setup would help.

It will probably be hard to find a narrow (i'm guessing you are thinking ~1/4") timing belt pulley with a 2" bore. You may need to modify or otherwise manufacture a custom pulley to go this route.
Electronics / Re: Looking for a Small High Torque 12V DC Motor
« Last post by bdeuell on May 10, 2016, 07:24:36 PM »
It sounds like you have already tried some motors with these specs, what did not work?
I am designing a robot for industrial use.  I am currently using a worm drive gearbox that drives the rotation using a V-belt system.  To permit the end user to disengage the drive mechanism, and move the equipment by hand, there is a clutch-like mechanism that adjusts tension on the V-belt. So, when the v-belt is slack, they can move it by hand.

However, this design also means that the encoder I have on the motor is not going to help me after the user has made use of the clutch.  So, I need an encoder on the main shaft of the equipment.  Currently, I have a 5-sensor Single Track Grey Code system that gives me 12deg of resolution. https://en.wikipedia.org/wiki/Gray_code#Single-track_Gray_code

However, ideally I would like much better resolution.  So, I am trying to work a commercial absolute encoder into the system. I have a hollow shaft that is 1 1/4" Dia, and a solid shaft that is 2" Dia.  Here is one that can adapt to various shafts, http://www.mouser.com/ds/2/670/amt20-534922.pdf
But, its max is an 8mm shaft.  And since my 1 1/4" Dia. shaft is hollow to allow for wiring to go though, I can't just make a adapter at the end.

So, I think I need to use a timing belt connection to tie the large shaft to the small shaft of an encoder.  But, this is proving to be a challenge as well.  The timing belt pulleys I find, that are for narrow belts, do not come with large bore sizes.  At Martin Sprocket, their timing belt pulleys that can handle my Shafts are for 1/2" belts, and the pulley is 1 3/8" Thick. I don't have much space to fit this, and this is a bit tight for my space.  I also would prefer a thinner belt, so hopefully my encoder can just take the pulley without any special effort to support the force of the belt and weight of the pulley.

Any suggestions for a source for timing belt pulleys for narrow belts, but for up to a 2" dia shaft? Or alternatively, a different method of putting an encoder on a shaft, but not on the end?

Thanks for any ideas,
Robot Videos / Re: Worlds Largest Walking Robot
« Last post by gtabasso on May 10, 2016, 10:36:13 AM »
My buddy Tim is building a 50-foot dragon now but its exoskeleton is not as fancy. His is cool though! He's doing it in his garage with industrial surplus parts. I will post photos when it's done.
Robot Videos / High School Robotics team in Ohio battle robot cage match
« Last post by gtabasso on May 10, 2016, 10:32:44 AM »
This competition just took place on April 30. We sponsored the Euclid High School team. The team they fought was the winner from last year. That team came in second this year.

Misc / Re: Hello everyone at Society of Robots!
« Last post by gtabasso on May 10, 2016, 10:27:12 AM »
Did you read Android Karenina?
Misc / Re: List your favorite ROBOT movies
« Last post by gtabasso on May 10, 2016, 10:25:46 AM »
What about Lost in Space and The Jetsons?
Misc / An Arduino Insect Robot Anyone Can Build!
« Last post by shinkpad on May 10, 2016, 08:43:17 AM »

This robot is an affordable, easy to assemble and fun to explore robot.

Antbo takes less than an hour to assemble and will teach you the basic principles of robotics.

Difficulty level: Easy
Mode: Autonomous, remotecontrolled
Input devices: Accelerometer, Distance Sensor, Light Sensor, Sound Sensor, Touch Sensor
Output devices: Servo RGB LED
Coding language: Arduino
Power: 4AAA batteries

The botís easy to assemble configuration actively urges interaction between parents and their children to provide a fun and intuitive experience that will simultaneously educate them to master basic programming knowledge.

Once he is assembled you can control Antbo using your smartphone, your own voice, or try "path control mode" where Antbo will follow the path you give him when you draw it on your Antbo app ( iOS & Android ).

If you like this insect robot, CHECK HERE and get more information.
Electronics / Re: New to robotics, my project
« Last post by jamieyello on May 09, 2016, 06:53:54 PM »
Hi, thanks for your reply. I've decided since this is a big complicated project first things first I just want to get a feel for creating things and just working with metal.

I have started looking at Maxon motors, I think I will be getting one of those, I'm looking at the ones in the $100 range to just mess with for now.
Electronics / Looking for a Small High Torque 12V DC Motor
« Last post by dbassman on May 09, 2016, 12:48:38 PM »
I'm hoping someone here might be able to help meÖ I'm looking for a High Torque 12V DC Motor. I've been unable to find one that meets advertised torque values.

Important considerations:

#1. 12V DC
#2. 120 RPM or greater
#3. Body diameter approximately 25mm
#4. Shaft diameter 4mm
#5. Torque (Sustained) >4kgf-cm; (Peak) >8kgf-cm
Any help would be greatly appreciated!
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