PCB Etching: Milling Method
This class will cover how to make your own PC Boards with MakeICTs PCB milling machine.
Sometimes the project just isn't complete until you have all the parts neatly soldered on to your own custom made PCB. In this class Tom McGuire will show us his favorite techniques for making an electronic project including making the PC board. We'll briefly go over designing circuits on a breadboard and trouble shooting them with some test equipment. Then we'll go over laying out the circuit board in Eagle PCB Editor. Members can follow along on laptops provided. And finally we'll make a board and solder some parts on to it . The machine can cut traces, drill holes, and do double sided boards.
Welcome. My name is tom McGuire and I have been making PC Board for many years. I was inspired by this companys product. http://www.lpkf.com/products/rapid-pcb-prototyping/circuit-board-plotter/protomat-e44.htm and went on to create my own machine which I posted in instructables. http://www.instructables.com/id/Easy-to-Build-Desk-Top-3-Axis-CNC-Milling-Machine/
Design a basic circuit (the motor speed revers circuit) If you need ideas try a simulator http://www.falstad.com/circuit/index.html Industrial distributors with detailed search engines: Digikey, Mouser, Newark, Future electronics. Hobby suppliers: Sparkfun, Adafruit, Jameco, mpja.com, Allelectronics, Electronic Goldmine, Local Retail: Radio Shack(still has a few stores), Lloyds Electronics(220 W. Harry) pull up the data sheet and look at all the specs  breadboard the circuit use the oscilloscope and discover where some caps need to go.
Document and layout
Show the Eagle download page () Show the PCB-Gcode downlosd page () Start a new Schematic convert to PCB layout and arrange the parts run the traces (the fun part) Run the upl for PCB-gcode Look at the files in Jviewer http://www.thingiverse.com/thing:72324 Or OpenScad http://www.openscad.org/
Copy files to a thumb drive or transfer them to a shared drive on the LinuxCNC machine Place your board material on the bed Zero your Z,Y,Z axis Load your file top layer (make sure M3 S1 is before the first move otherwise the spindle won't spin) Set any touch off offsets you might need to position the mill paths on the work surface. A little WD40 will keep the dust down and keep the bit sharp. Press Play (Oh and ware safety glasses) load the mill bit Zero the X,Y,and Z axis hit play Load the drill files Change the bit DON'T RE-ZERO THE X or Y AXIS Just re-zero the Z axis for the drill bit hit play If your doing double sided board flip it. Align to some holes by moving the head around Press play again.... Fin (you have a board) Cut off the excess board material with the metal shear or tin snips.
Clean up the board. You may need to peel some copper from a few places. Heat the unwanted copper area with the soldering iron and lift the copper with an Exacto knife. Then grab it with some tweezers and peel. WD40 or Acetone helps clean the board. When soldering, always heat the joint with the soldering iron and then feed the solder into it. Let the solder flow. If its too dry clean the tip of the iron or use some flux to wet the joint again. Solder some parts on
Hook it up and play with it
Want to setup Eagle on your computer?
After you have downloaded and installed Eagle http://www.cadsoftusa.com/download-eagle/ Download the PCB-gcode files from here http://www.pcbgcode.org/ Depending on what system your running on you want to find out where the Eagle program is keeping the .upl files and put the downloaded files in the same directory. Here are some further instructions on how to use PCB-gcodehttp://www.pcbgcode.com/ Here's a good instructables on doing it. http://www.instructables.com/id/Machining-a-PCB-Using-an-Inexpensive-CNC-Machine/