On Tuesday 13 November 2012 22:26:10 Scott Hasse did opine: > Thanks all for the advice. I hadn't considered the case of reversing > the spindle a bit, that does shoot that idea down. Although I've > enjoyed Gene's spindle encoder adventures vicariously I don't think > that's a path I want to walk, so at this point my plan is to obtain a > 1:1 timing belt pulley and use the Z pulse in the encoder I already > have. Hopefully that should be fairly straightforward.
Be aware the timing belt must be tight. Any slack/slop in the coupling will eat your lunch when tuning it for stability. That would generally have to have a second shaft in bearings good enough to take the belt tension as you can't put that sort of sideways pull directly into the encoders own bearings. > > Thanks again and I'll let you know how it goes. > > Scott > > On Tue, Nov 13, 2012 at 12:50 PM, andy pugh <bodge...@gmail.com> wrote: > > On 13 November 2012 18:34, Gene Heskett <ghesk...@wdtv.com> wrote: > > > I'd have reservations about index sensing at servo rate, depending > > > on the top speed of the spindle, and try to set the mesa to respond > > > in real > > > > time. > > > > The Mesa encoder counter responds in Mesa time, and zeros the counts > > instantly. The next time that the FPGA is polled the return value is > > the number of counts since the index. > > > > -- > > 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 > > ------------------------------------------------------------------------ > ------ 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 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! A city is a large community where people are lonesome together -- Herbert Prochnow ------------------------------------------------------------------------------ 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
