Re: [CAD_CAM_EDM_DRO] Re: Digitizer probe progress

Yes, it detects where the tool is. it (should) slowly crash into the work.
so slowly and so carefully that it doesnt hurt anything or move anything.
In CNC EDM, we use detect voltage drop to determine when the tool
(plus) touches the work (-). When the voltage difference dissapears,
we know we 'touched, and record this data.
For what? well we can touch the top to determine the surface height.
We can touch a bunch of tool to some surface to find tool length
differences. We can touch two sides to find a middle, or 4 to find
a center.
Some mills do this with a 'skip cycle'. So if you can insulate the work
or the tool ( either one ) a 12 volt dc source at maybe 50 to 100 mA
can be used as the sense voltage, and it's absense can be detected to
trigger a position capture in the CNC.
tomp