On Wednesday 21 November 2012 16:05:50 andy pugh did opine: > I have a rather interesting datasheet from Allegro. They have a sensor > that detects either a magneic codewheel, or a gear tooth (with a > biasing magnet behind the sensor). > The neat part is that the pulse width is 45uS in one direction, and > 90uS in the other. > It is intended for crankshaft sensing, where index is done by a missing > tooth. > > The typical code-wheel is a pressed steel part 100m diameter with a > 70mm bore. This is pressed on to a hub with a 30mm bore in the case of > the one I have on my desk at the moment. > > The encoding scheme seems compatible with software/parport sensing, > and the form-factor seems ideal for a lathe spindle encoder. > > I wonder if it is worth adding support to the encoder driver?
A 100mm wheel is a bit large for my small lathe, but probably fine for the 9" and up stuff, and if its quadrature direction sensing too, or 2 sensors could be made so, then it sounds like something that would be a heck of a lot less fuss to install & make work. IOW, a great idea Andy. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! Horace's best ode would not please a young woman as much as the mediocre verses of the young man she is in love with. -- Moore ------------------------------------------------------------------------------ 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
