On Thu, 15 Nov 2012, Gene Heskett wrote: > On Thursday 15 November 2012 15:00:09 Richard Ray did opine: > >> On Thu, 15 Nov 2012, andy pugh wrote: >>> On 15 November 2012 19:13, <[email protected]> wrote: >>>> How might I connect this, or something similar, via a parallel port >>>> inexpensively, no MESA, to provide feedback for a stepper all running >>>> linuxcnc >>> >>> Is it quadrature output? >> >> Yes >> The "this" above was suposed to be http://wiki.makerbot.com/mle >> Had a brain fart >> > Thats great, I grabbed the eagle stuff and BOM. But I note that there is > no index output on this board, so am I to assume that using the linear > strip, cut to length and stuck on a rotating part, it will not generate a > meaningful index pulse, and that to do that I would probably need to order > a round magnetic wheel from one of the suppliers listed on the AMS page for > that chip? > > However, I note that its companion, the on axis, magnetic rotary encoder > also leaves out the index pulse that chip supplies. So other than setting > up a mechanical stop, and homing to that, and converting to Christian > Science so you can believe it will hold true at 2500 rpms till the next > powerdown, this is not going to be usable for a spindle position control. > Bummer.
Or make youir own magnetic strips http://forums.parallax.com/showthread.php?130799-Refrigerator-Magnet-Encoder ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
