Homebrew touch probe for 3D scanning

Graham writes – “This was supposed to be my first useful milling project. It is based on conceptual drawings that can be found in the files section of the CCED yahoo group, these in turn where based on the Renishaw patent. Touch probes can be used for two operations. One is to find edges and the center of holes etc. as well as tool setting; the other is as a means to digitize a 3D object. That is to produce a 3D computer model of the object. “ [via] – Link.