Let's Make Robots!

Inexpensive PCB Manufacture

First off, if I've missed a previous forum thread on the topic, I's sorry and could I have a link?

Picaxe LCD Direct Connection Problem

Hey There,

I've hit a snag on a project of mine. I've been trying to build a servo calibrator (to test a servo's limits and test them on robots before they're connected to the motherboard) which should operate by positioning a servo depending on the position of a potentiometer, and display the pulse rate on a 16x2 LCD. I've built one before, with an LED display and a single servo output, but this one should handle two servos.

Except it doesn't. I won't even handle one.  There's two major problems I've found which I'm looking for solutions to.

Basic Robotic Arm - Able to manipulate a variety of objects within large size and location parameters.
Using a
My Learn-As-You-Go project...  A few specs for the finished project: Read more
Simple Line follower, with additional ability to stop when objects are detected in front of it and turn around when the end of a line is detected.
Using a
I built this robot for a University course on C Programming, and later (after my assessment, although before the end of the course) added the tank tracks to replace … Read more

Bearing mounts

Hey there LMR,

 I've hit a bump in a project of mine. I need a simple assembly to house a small ball bearing that will support part of a robotic arm assembly. It plays a part in the wrist joint, as one side is directly servo driven but the other needs a bearing to hold in steady. The bearings I have are 8mm in diameter and have a 4mm diameter hole for a shaft or bolt. I have access to aluminium sheet, acryllic, and MDF wood, as well as M2, M3, M4 bolts and rivets for fasteners. Anything else I will have to source, but it shouldn't be too hard of a problem.