Let's Make Robots!


enlarge gear hole

i need to enalarge a hole in a plastic gear from 3mm to 9mm How can i do it?

Custom Gearbox

Hey all I have built a few small scale bots and am now working on a larger 200lb bot. I was wondering if anyone had constructed their own gearbox for a DC motor. If so how did you do it and what kind of gears did you use?


Thank you for any direction you can supply.


Gears in Sketchup

In robotics, you  usually want more torque or speed out of your motors.

Arduino tamiya twin motor gear power supply and stuff


Hello thereI am building a simple Arduino tank but the problem is that after running it for 20? seconds it starts to run slower and slower. Then after turning it off, and on it does not run anymore. After letting it stay off for almost 5 minutes, it runs really slow. Looks like the 9v battery can't handle it?

Acoustic Noise Reduction

So in another forum I explained how I was using power screwdriver motors to move my rocker bogie suspension system. So I was wondering if you guys had any ideas on how to dampen the acoustic noise(not the electrical noise) coming from these motors. They use planetary gearboxes which I know are notorious for being loud but I need the torque that they provide. I was planning on using some sound proofing material to dampen the sound but I was wondering if you had any ideas. I know it is kind of a weird topic but thanks for your help. 

Basic robot for testing code and sensors
Using a
Generic experimental Arduino Robot          I put this together one or two years ago and have been fiddling with it ever since. The version in the picture … Read more
Uses 3,5mm jack to transfer signals on a rotating axis.
First thing first. This is just a quick and dirty attempt to improve the 360 degree sonar idea. I have seen some of the designs at LMR with a 3,5mm jack plug and … Read more

Building plans for the tamiya tiwn motor gearbox

I built my gearbox in the wrong configuration, it was 3 months ago and I lost it... Does anyone have a JPEG a PDF or anything else of the plan for that gearbox ?



Tamiya part number.


How do you choose motors for something like http://letsmakerobots.com/node/87 ?

I've bought two motors (no gearbox, just motors), hooked them up and expected it all to be a little bit "nervous". However, they can't move even that little thing, only can spin in the air.

So... what would you guys recommend? Could anybody just give a little explanation, like "Motors FAQ for dummies"?


GM10 motor strength

I've ordered th GM10 geared minimotor from solarbotics.

link: http://www.solarbotics.com/products/gm10/

I know some of you have used it before.

Mine haven't arrived yet, so I'm still dreaming about it.

Here's a quick question for those who know it;

How big a wheel can I connect directly to the output shaft on the GM10 without any significant loss of power. I see they ship it with an optional 25mm wheel, is that the biggest recommended diameter, or can I go bigger without gearing it down further?

RC-servo to motor conversion   This is a smart little trick i had read about in the magazine "Elektor Electronics" a year ago. In 15 minutes you can turn your … Read more