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I wanted to build something that was accessible and not too expensive for people wishing to understand and experiment with inverse-kinematics. I thought while I was doing that it might also become part of my ongoing ball contraption project.

Essentially it's very similar to a robot dog leg, but even simpler because the third axis is linear rather than rotary.  CAD and code will get published before it goes public on Tuesday 2nd March.

Next week's video for Patrons should be the Really Useful Robot Arm - but this video is quite a good primer for that because it's very similar, but tipped on its side.

Files

How Robots Use Maths to Move - PREVIEW VERSION

I get asked a lot of questions about Inverse-Kinematics for Robotics. I've used Inverse-Kinematics a lot in the past for Robot Dog projects, so I thought I'd do a simple demo video for a simple Kinematic model, and also build another stage of my Great Ball Contraption. You can support me on Patreon or buy my Merchandise: *************************** Patreon: https://www.patreon.com/xrobots Merchandise: https://teespring.com/stores/james-bruton *************************** Affiliate links - I will get some money of you use them to sign up or buy something: *************************** Matterhackers 3D printing supplies: http://www.matterhackers.com?aff=7500 Music for your YouTube videos: http://share.epidemicsound.com/xrobots *************************** Other socials: *************************** Instagram: https://www.instagram.com/xrobotsuk Facebook: https://www.facebook.com/xrobotsuk/ Twitter: https://twitter.com/xrobotsuk *************************** CAD and Code for my projects: https://github.com/XRobots Huge thanks to my Patrons, without whom my standard of living would drastically decline. Like, inside out-Farm Foods bag decline. Plus a very special shoutout to Lulzbot, Inc who keep me in LulzBot 3D printers and support me via Patreon. HARDWARE/SOFTWARE Below you can also find a lot of the typical tools, equipment and supplies used in my projects: Filament from: https://www.3dfuel.com/ Lulzbot 3D Printers: http://bit.ly/2Sj6nil Lincoln Electric Welder: https://bit.ly/2Rqhqos CNC Router: https://bit.ly/2QdsNjt Ryobi Tools: http://bit.ly/2RhArcD Axminster Micro Lathe: http://bit.ly/2Sj6eeN 3D Printer Filament: http://bit.ly/2PdcdUu Soldering Iron: http://bit.ly/2DrNWDR Vectric CNC Software: http://bit.ly/2zxpZqv Why not join my community, who are mostly made up of actual geniuses. There’s a Facebook group and everything: https://www.facebook.com/groups/287089964833488/ XROBOTS Former toy designer, current YouTube maker and general robotics, electrical and mechanical engineer, I’m a fan of doing it yourself and innovation by trial and error. My channel is where I share some of my useful and not-so-useful inventions, designs and maker advice. Iron Man is my go-to cosplay, and 3D printing can solve most issues - broken bolts, missing parts, world hunger, you name it. XRobots is the community around my content where you can get in touch, share tips and advice, and more build FAQs, schematics and designs are also available.

Comments

Dean Edis

Cool. I think this is my favourite section yet!

Anonymous

No music over the 3D printing montage?

Pete Mertz

I love your projects like this, they make me want to go on amazon and buy a bunch of servos to try it out myself! Being remote for everything, of course the first thing I thought of was "I should build this and put a bunch of LEDs on the end so I can have my face lit up for meetings"

XRobots

Sounds like a good reaction - it's only two servos and a motor! I guess it could be used for multiple quite useful things ;-)

Anonymous

Nice. Did you program a long delay before picking up the balls in succession? seems if you place one it gets it right away...just curious.

XRobots

There's a delay so the arm can return to the start before it picks up again if there are more than one, otherwise the arm doesn't return to the home position properly.

Anonymous

Thanks James - this was really useful - I joined your patreon as a result!!

Anonymous

Hi James, can can i have the codes?

XRobots

Sure, most of my projects are open source, so CAD and code is on Github: https://github.com/XRobots/BallContraption/tree/main/IK%20Arm