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?

line follower sensor board

i'm building a line follower robot and i have to make the sensor board.i have 7 qre1113, in your opinion what is the best way to put them? i was thinking of something like this:

12 servo power supply

i am building this hexapod : http://letsmakerobots.com/node/29821 , and i have few question about the power supply.For testing the servos i was using 4 AA but now with 12 servo i want to use bigger capacity battery for example a lipo.Can i run the servo directly from it or i need to regulate down to 6v?

Pololu hp motor with a L293D

Hi all,

do you think that with a l293d i can control two of this motor : http://www.pololu.com/catalog/product/1093 with a 2 cell lipo as power supply?