andy pugh wrote: > On 22 November 2012 20:51, Jon Elson <el...@pico-systems.com> wrote: > > >> Generally, I just don't see the advantage of going to a single >> sensor/single wire >> scheme when there are so many potential pitfalls. >> > > The single-wire is just a side-effect of using an encoder wheel that > is readily available and has a big centre bore. > > To buy the crank code-wheel new is not that cheap ($100) but there > ought to be many in the junkyards now. The correct pickups are less > likely to exist, but those are $17. > The Allegro ATS667 series are about $6 each, but you need 3 for a quadrature+index scheme. But, the advantage is you can use any available steel gear on the spindle as the encoder wheel. That's what I did on my Bridgeport, used the existing bull gear inside the head. I made a small dimple in the gear for the index pickup. This turns into a 324 count/rev encoder (81-tooth gear * 4 in quadrature.)
Jon ------------------------------------------------------------------------------ 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
