Robotic Claw

by Kepler, published

Robotic Claw by Kepler Mar 2, 2012
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Robotic Claw by Kepler is licensed under the Creative Commons - Attribution license.

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This is a small robotic claw designed to pick up a can of Red Bull Shot. It was really an exercise to make the simplest possible mechanism that would get the job done, with the least number of parts and as small as possible. It works quite well, even though the pincers could do with a little bit more friction for a better grip (add rubber bands?)

Check it out at: http://youtu.be/IM5oRUVfCBY


  1. Insert a nut into the underside of servobox.stl
  2. Fit servobox.stl over the mini servo
  3. Attach rightpincer.stl to the shaft with the servo accessories (it might be a good idea to screw it in place)
  4. Attach leftpincer.stl with a M3 screw

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What screw length do you recommend? Thanks!

Nov 26, 2015 - Modified Nov 26, 2015

Hi, how are you guys attaching the screw on the non motor side arm? Is there a hidden nut inside the box part that I am not seeing? bolt? screw? nut? thanks

ahhh re-read instructions... Step 1. Insert a nut into the underside of servobox.stl


Nov 26, 2015 - Modified Nov 26, 2015
Kepler - in reply to lagunacomputer

=) Glad you figured it out before I had time to reply!

This design is scary good!

Just wanted to thank you for the simple but versatile design of yours Kepler. Managed to win two out of the three rounds of the recent competition I had thanks to this. Only problem I had was that the pincer not attached to the servo keeps getting loose the more the claw moves (screw and nut connection gets loose). This causes the pincer gear connection to disconnect and prevent this from moving. Is there any way I could go about fixing this? But thanks again bro. Wish I could get you a beer or something

Sep 4, 2014 - Modified Sep 4, 2014

Hi. I am new to 3D printing and I got this printed out but I am having a little trouble assembling it. Is the right pincer hole supposed to fit right through the servo shaft or are you supposed to just place it over it and place the servo horn over it? Any help would be much appreciated.

The servo horn is first attached with glue or a screw (or both) to the pincer. Then, the servo horn is attached to to servo with another screw to keep it in place. I hope that helps!

Hi this is Pias from Bangladesh . Your work is very much appreciated . I want to make one . Since I don't have a 3d printer , I have to use laser cut to make one . For this I need .dxf file of this design . Can you give me this ? my email ID is [email protected] .

Thanks in Advance .

Printed this and played with it as part of our introduction to Arduino course at House4Hack (a hackerspace in Pretoria, South Africa) Check it out: http://www.house4hack.co.za/robotic-claw-by-kepler-in-actionhttp://www.house4hack.co.za/ro...

Wow, that's great! I'm glad this thing was useful and that it was used to teach some Arduino skills! Looks like a pretty cool hackerspace you've got there....

Specs on the mini servo.

Part number? Mfg?


Man of few words, eh? :-P If you look at the picture you can see that it is a Tower Pro micro servo. There are a lot of similar servos around, I think they all have the same specs and size. I bought mine here: