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21
Misc / [advertisement] New Omni Wheels!
« Last post by ServoCity on January 24, 2017, 10:12:14 AM »

https://www.servocity.com/4-omni-wheel
We are excited to roll out our new Omni Wheels! Omni wheels have the unique ability to not only roll forward but they also can roll side to side thanks to their built-in rollers. This behavior can be very useful. Let's take a look at an example four wheel robot chassis design (as seen in the header graphic). Since the front wheels are omni wheels, it only needs to drive the back wheels. This makes for a much simpler setup since it does not need belts or gears to transmit force to the front wheels, nor does it need a second set of motors to drive them. As Gordon Bell once said "The cheapest, fastest, and most reliable components are those that aren?t there".

When the back wheels on our example bot are driven forward or back the omni wheels will follow suite. And when the back wheels rotate in opposite directions, the omni wheels' side rollers will (you guessed it) roll sideways, allowing the robot to turn.


Our Omni Wheels have both the 0.770" and the 1.50" Actobotics patterns on them and each wheel has 10 rollers. They are designed so that they can be stacked together to get a wider wheel profile. Simply use an 1/8" hub spacer (545372) between them, and clock them so that the rollers alternate. And oh yeah, these things are priced to move! $9.99

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Misc / 2nd Annual Robot Art Competition 2017
« Last post by robotart on January 22, 2017, 01:02:47 PM »
Thought everyone might be interested in the 2nd Annual Robot Art Competition (robotart.org), which features $100,000 in cash prizes. We're a nonprofit, and the contest is free to enter and open to any age. The goal is to challenge participants to produce something visually beautiful with robotics. It's ideal for robotic student projects involved in robotic planning and image processing, especially those who have an appreciation for art. Details, team signup, and last year's winners are at robotart.org.

Participants can use any robotic system to produce the artwork. While most teams are using existing robotic arms, the contest is open to custom hardware. Students can enter up to six paintings in each of the competition categories of "fully automated execution" and "manually (semi or tele-robotic) generated" art, where generally, there is little or no specialized software used to control the robot.

The deadline for artwork submission is April 15th. Let us know if you have any questions.

Thanks for your time,
RobotArt Team
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Robot Videos / Soft Modular Robot achieves Self-Reconfiguration
« Last post by SyntheticMachinery on January 19, 2017, 04:39:29 PM »
Hello All,

I would like to share a video about our recent research on soft modular robots !

This machine is able to self-reconfigure into different shapes, similarly as living cells,...


Cheers,

J.C.

ha,.. if you are interested in more info here is the link to the paper:

https://www.researchgate.net/publication/312121627_Soft_Modular_Robotic_Cubes_Toward_Replicating_Morphogenetic_Movements_of_the_Embryo

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Mechanics and Construction / I hit Paydirt!!!
« Last post by JustANerd on January 18, 2017, 12:29:42 PM »
Hey guys and. Gals! I haven't been on here in forever. Had some family health issues, so life took a back seat. Things have finally settled down though, and just when I decided it was time to start up playing with my toys as my wife puts it, I run across this at a scrap yard! A power chair! Paid scrap price for it too. 28.31. it's a good start! Now to take it apart to get it out of my truck. Lol
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Misc / Re: complete database crash, resolved, note to users
« Last post by Admin on January 17, 2017, 11:00:52 AM »
update:

We are going to upgrade the entire server, the hardware, and the software, tonight. This will give us 3x the capability with half the operating costs.

Hopefully the entire process will be smooth and disruption minimal.

If at any time something seems odd, feel free to contact us. If you post anything, keep a backup of it for the next 24 or so hours just in case of the worst. ::)
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Misc / complete database crash, resolved, note to users
« Last post by Admin on January 14, 2017, 07:10:52 PM »
As some of you know, we have been around for a LONG time, since summer of 2005, beating out just about every robotics community website out there. Much of our innovation has since been copied by the many new websites out there.

This morning, for the first time ever, we suffered a database corruption (zomg!). After 11 hours of bashing heads against tables (not an exaggeration), all 12 years of data has been restored...

....with the exception of posts made on January 13, 2017. Unfortunately that data has gone to robot heaven. If you posted anything then, you will have to repost. Sorry!
30
Software / Inverse knimenatics formula.
« Last post by IceMetal on January 11, 2017, 02:46:53 PM »
I found this inverse kinematics calculator on the forum
https://www.societyofrobots.com/downloads/Robot_Arm_Designer.xls
My problem is that formula would not reach the yellow and black area, any ideas how can I change the formula so it would work and it would have full reach?
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