A Belt and Pulley on the X-Axis by Jerry D.
When Jerry was faced with a problem of not having drivers with enough current to drive the x-axis of his blackFoot. Jerry had the HobbyCNC 3/4 axis driver board, but the drivers are underpowered for this machine, so Jerry think of an alternative to purchasing new drivers, he solves the problem mechanically.

Laser Mirror Alignment Tutorial for Vertical Laser XL
In this series we'll be explaining how to align the laser mirrors on your Vertical Laser XL machine. Note that these techniques can also be used for alignment on the blackTooth laser cutter and engraver.

Step 1 - Linear Slide Bearings
This tutorial is dated, if you are considering a CNC for your personal use, we would highly recommend purchasing a kit that is very stable from our wide range of machines available. If you are looking for great linear slide bearings, see here. Through much of my research on homemade CNC machines, I found that the mechanism to provide linear sliding is simply the use of an angle ("L" shaped piece of metal), bolts or screws (5/16" at 3/4" in length), nuts (5/16") and standard skate bearings (I use ABEC7/608Z). The design is actually very efficient and clutter free. When I say clutter free, I mean that the exhaust of sawdust that the CNC will produce will not clog up these bearings. Collar bearings, or bushing bearings I believe will have the tendency to receive material within the bearing housing creating a binding effect. If you are wondering what a bearing bushing is, imagine a cylindrical tube with little balls housed on the inside surface of the tube. The skate bearing method is like creating a new kind of hybrid inline skates and those skates you used in the 80's with the four wheels (coming back into style, why?!?).