On 23 November 2012 14:26, Gene Heskett <ghesk...@wdtv.com> wrote: >> The target wheels we have on our engines are _not_ ferrous. They are a >> magnetic track and the crank sensor has no internal magnet. >> (I can't find that actual sensor on the Allegro site). > > For a hall sensor to work, there must be a magnetic field for it to sense.
Yes, there is a ring of non-ferrous magnetic plastic stuff (like very thick cassette tape) round the periphery. Basically just like this stuff: http://www.machine-dro.co.uk/high-accuracy-magnetic-linear-tape.html But applied to the disc prior to the the pattern being applied. > Not all steels are magnetic though Yes, I know. I have a PhD in ferrous metallurgy. I've lost interest. Everyone with an opinon seems to think this is a bad idea. I have no need for it, so I won't bother. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
