There are various designs to CNC laser engravers and I have been wanting to build my own, which should meet certain needs which I have to engrave on stainless steel. 
I wanted the two axes to be configurable after assembly in terms of angle of the laser in relation to the axes. The reason for my requirement is to engrave on the inner part of the metal bell of a stethoscope. With a laser beam at 90 degrees to the surface, this would not be possible, since the smaller bell on the opposite side of the stethoscope’s chestpiece is occluding the line of transmission of the laser beam.
Currently I have obtained a 15 Watt Blue Ray laser from China which works well on metal when I’ve tested it on my other CNC Machine connected to an Arduino.
So I developed a simple and very affordable way of mounting the tracks:
Requirements: 8 pieces of threaded rod and a wooden base, the applicable size which you need.
The threaded rods are then pushed through the drilled holes in the wooden base and the CD-ROM track with the stepper motors is fastened on the threaded rods.
This is a rather simple trick, but works well to position the base table at an angle to the laser beam or vise versa. This makes it possible to tilt the laser after assembly in relation to the table.
