Let's Make Robots!


Unlimited power! But how to put it to good use? (motor torque)

Well not exactly unlimited power, but a lot of power! My wifes lower back is worn out so she can't walk long distances and because not everything is reachable by car we have a foldable disability scooter to overcome that problem. Unfortunately the batteries needed replacement, quite expensive.

The good news is that I now have the old two 12v traction batteries. One can only hold about 60% of it's charge, not of much use. The other is 90%, definitely good enough to use and since the battery is about two times as small as a regular car battery it's perfect for a robot!

Servomotor torque requirement for a quadruped robot


I'm planning to build a quadruped robot soon. My design is very similar to the design in the following link.


I'm not that good at mechanics. I like to calulate the torque required for each motor. Is it ok to use the formulas/procedure in the following link to design a quadruped shown in the above link?


How to increase Torque and reduce speed


i'm building a cat feedar using a rotating hooper..my problem is the rotating speed of the hooper is too fast and don't have enough torque..A few suggestion that i have gather is to buy a new motor with higher ratio.is there any other way to accomplish the same result?

since i have 5 cat.. i'm still looking a way to dispense the food into 5 tray(if possible)..anyone here have any suggestion how to achieve it...Maybe using rotating tray?(but still the same problem with the motor ,not enough power)



Would this motor be able to lift 150 lbs?

Would this motor lift me?  150 lbs or so?




Its for my walking chair, it will be chained to a shaft and the shaft will have about 150 lbs (NOT static load) or so of force to deal with.


Thanks :)

Suggestions on choosing motor


Im considering on buying the following motor for my project.


Quick specs : 12V, 150 RPM, 195 oz-in torque, 67:1 ratio

GM10 pager motors and Picaxe

Hi All,

Is there a secret to getting the picaxe to power a pager motor, for example, one capable of swinging a small drumstick?

I'm working with 3 GM10s. 2 for the wheels via the L239D, and one for a "percussion actuator". The percussion actuator's not working for the controller:

The Setup:

1 gm10 wire connected to pin 4

1 gm10 wire connected to 0v

5.5 V single power supply

ANY combination of Darlington / no darlington / 330 ohm resistor / motor driver in or out

The Code:

high 4