John, For some the obvious is obvious. For me the obvious is not necessarily obvious. :) At this time I was only trying to find the resolution of one of the sine waves to see what I had to work with. thanks Stuart
On Fri, Oct 29, 2010 at 12:05 PM, John Prentice < j...@castlewd.freeserve.co.uk> wrote: > Stuart > > Apologies if this is stating the obvious, but the existing board almost > certainly uses the amplitude of the Sin/Cos to interpolate the basic counts > and so get a useful accuracy out of the scale. Heidenhain often have a > ruling of 20 micrometres so with quadrature, discarding the analogue > information, you only get 5 micron resolution. > > John Prentice > > ----- Original Message ----- > From: "Stuart Stevenson" <stus...@gmail.com> > To: "EMC2-Users-List" <Emc-users@lists.sourceforge.net> > Sent: Friday, October 29, 2010 5:58 PM > Subject: [Emc-users] scale/encoder > > > > > > Gentlemen, > > I have a manual CMM with scales. The display box is very old and almost > > functional. I would like to replace it with EMC2. Simple enough except > for > > the scale feedback. The scale feedback is four sine waves at 0, 90, 180 > > and > > 270. These are, I think, approx 1 volt magnitude. What can I use to get > > this > > into EMC2 in a usable fashion. > > The original display has an 'amplifier, check, divide' board. > > I don't know the resolution of the sine wave. > > I have an sn7404n chip and a couple germanium diodes hooked to a bread > > board. I don't see anything out of the chip. I was expecting a pulse that > > would allow me to determine the resolution. At this time I have exceeded > > my > > electronics capabilities. > > Is there a chip or reasonable board I can use to change the sine waves > to > > pulse or quadrature? > > thanks > > Stuart > > -- > > dos centavos > > > ------------------------------------------------------------------------------ > > Nokia and AT&T present the 2010 Calling All Innovators-North America > > contest > > Create new apps & games for the Nokia N8 for consumers in U.S. and > Canada > > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in > > marketing > > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > > http://p.sf.net/sfu/nokia-dev2dev > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > ------------------------------------------------------------------------------ > Nokia and AT&T present the 2010 Calling All Innovators-North America > contest > Create new apps & games for the Nokia N8 for consumers in U.S. and Canada > $10 million total in prizes - $4M cash, 500 devices, nearly $6M in > marketing > Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store > http://p.sf.net/sfu/nokia-dev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- dos centavos ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
