Floating head / switch pics?

[KKamel]

Has anyone built their own floating head for use with a thc?

iw built a z axis, its basicly just a linear slide with a carrige and something to drive it with. Now is the time to add my torch holder and floating head switch, however i cant come up with an idea i like. Iw been searching around for pics and come up with nothing usefull. This pic was found on sheetcam's webpage http://www.sheetcam.com/THC300/Misc/Z_Axis.jpg how is the switch triggered when the torch touches the material? or is it just a home switch?

[Apples]

Have a look at mine. just finished it the other day. ran out of aluminium so I had to double a few bits together.

Peter
Australia