Laser Controller Tutorial Part 3: Wiring Motors to Drivers and Calculating Steps Per Inch
In this series we'll be examining how to install the laser control unit. We will start with the basic wiring and move all the way up to software and functions.

Google SketchUp Primer on Personal Fabrication
The SketchUp folks did a great write-up on additive and subtractive fabrication as it relates to SketchUp. Moreover, they talk about some very important issues related to these processes. If you're starting out in CNC or 3D Printing, this is a must read.

Tramming the Router or Spindle (Making Sure it's Perpendicular to the Table)
Tramming the head (spindle or router) of a CNC router can be done with a simple old machinist trick using a long bar bent in a special way so that you can very accurately ensure the router or spindle is perpendicular to the bed (table) of the CNC machine.