Peter Like steve im having much the same problem if you have a circuit for I index stretcher it would be well handy
Kind Regards Steve Beale Skype steve.beale -----Original Message----- From: Peter C. Wallace [mailto:[email protected]] Sent: 18 August 2009 00:55 To: [email protected]; Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Realistic spindle encoder count for parallel port? On Mon, 17 Aug 2009, Steve Blackmore wrote: > Date: Mon, 17 Aug 2009 23:39:06 +0100 > From: Steve Blackmore <[email protected]> > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Subject: Re: [Emc-users] Realistic spindle encoder count for parallel port? > > On Sun, 16 Aug 2009 21:03:54 -0700 (PDT), you wrote: > > >> Can you use both encoders at once? >> High resolution for low speed and Low resolution for high speed? >> >> >> You could also do this with the high resolution encoder and a gizmo >> like the USdigital divider, only with 2 selectable divide ratios run >> from a single I/O bit, say 1/1 and 1/64. This is easily do-able in a >> $ 1.20 CPLD > > A divider would work well, but I'm no programmer and wouldn't know > where to start. If I get a free bit of time I'll cobble together a quadrature divider, basically: 1. Input digital filter 2. Quadrature decoder (quadrature to up/down) 3. Up down modulo N counter (for divide by N) 4. 2 bit up/down counter 5. 2 bit binary --> quadrature encoder 6. Optional index stretcher I even think we have some CPLD bds we never used that I can send over for shipping cost. > > If I can't find a simple solution it looks like I'll have to get > another encoder. > >> Would you need the index at high speeds? > > My normal working range is 600-1200 rpm. Most of my threading is done > at 600-1000 rpm, depending on pitch. > > Steve Blackmore > -- > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ---------------------------------------------------------------------------- -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
