Laser Cutter Focus - Measuring Focal Point and Depth of Cut

Update: Install lens with curved side up! I get confused and say it wrong in the video. To get a good cut or engraving you need to know where you laser is focusing correctly. Here is a method to check the true focal point of your laser head and determine the potential depth of cut. Prefer to read? Check article on my site: http://makestuffnow.com.au/set-laser-...