On Fri, 6 May 2022 at 00:51, gene heskett <ghesk...@shentel.net> wrote:
> But they all, better ones anyway, use an inductive sensor to measure bed > flatness. That sensor is uber cheap as a service part. What sort of drive > does it use Most of them just need a supply voltage (typically a minimum of 9V up to 30V) and then connect the output wire to the 0V wire (NPN) or to the +V wire (PNP) For interfacing with 5V logic you need NPN, but for Mesa cards with 24V IO it is typically best to use PNP. There are two types, shielded and unshielded. You can tell them apart by whether the threaded outer comes right to the end. Shielded can be buried in a metal part and still work. Unshielded will detect the part they are mounted in, if it extends into the unthreaded area. I tend to bury them right in the machine frame and so use shielded. My Y and Z ones on the mill can be seen here: https://photos.app.goo.gl/U6L92r7ndpda9ALL8 (well, you can see one of them, and guess the other) They come in a range of diameters between 4mm and 30mm and a range of detecting distances. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
