touch probing for tool length calibration

Hi,

I've got access to a 3-axis-mill that uses replacable milling motors.

On disadvantage of them is that the used cutters are hand-placed & thus 
vary in length.

Now I was wondering - is there any chance of using the gcode for probing 
and dynamic tool length compensation to enter a calibration-routine 
after the tool has been switched?

We would of course need a "inverted touch probe" thingy - e.g. 
capacitive sensor plate, or something like that - to move the cutter to 
& get feedback over the tool length.

This most probably would also involve using two coordinate systems, on 
for the piece and one for the length probing.

Any suggestions?

Diez

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/