Let's Make Robots!

3D Printer - What To Look For?

So I've been doing a bit of looking around, as a 3D printer might be on the cards for purchase soon.

To save myself a many hundred dollar mistake... can anyone recommend what to look for in a printer? Kit construction is fine, but I'm also seeing some $600 - $1000 dollar ones on eBay that look pretty good for a first time printer.

Main applications would be small custom parts for robotics.

Thanks for any opinions.

Motor Arm Length Calculator

Below is a picture of what I'm trying to build. This is the motor that I'm using, which has plenty of torque.


Linear Actuator Control

This is the setup that I am trying to make:



Can anyone please recommend a motor controller for this setup, that requires no encoding?

RC Transmitter Potentiometer

Wondering if anyone could give me some help please. I'm trying to understand the problem, let alone a solution.

What I want to do is control via RC a 24V DC motor and a linear actuator. On the remote control, I would like to build a In/Out button for the linear actuator, and a dial (numbered knob) for setting the speed of the DC motor.

How to Choose an Electric Motor

Finally I am sick of mowing my lawn, and am starting to plan a robotic lawn mower.

I would like to use one of these batteries (12V Li-ion) on the mower.

C# To Arduino Programming

Good morning LMRian's.

I have purchased my very first Arduino (Uno), and am trying to find a simple "blink" tutorial to use C# (Visual Studio 2012) to the Arduino onboard LED.

Can anyone please recommend any links?

Humanoid Robot Project Group.

Hi there fellow LMR'icans.

I have wanted for a long time to start building a humanoid robot - and I know how huge that project will be. Still, better to have tried and failed, then always had the idea sitting in my brain doing nothing.

Variable Voltage

Can anybody please recommend a variable voltage regulator that I can purchase to test out variable voltages when building an electromagnet?

Electromagnetic Linear Actuator Idea

G'day all.

I've been trying to think of a silent linear actuator, that is:

   - Quick or slow to move.
   - Offers precise movement.
   - Silent.
   - Run off electricity (ie: not on hydrolics).

I have found this video which looks like the closest to the above requirements:
https://www.youtube.com/watch?v=58o1LxwRmrM