On Wed, 2009-10-07 at 09:43 +0200, Sven Wesley wrote: > 2009/10/7 Kirk Wallace <kwall...@wallacecompany.com> > > I use EMC2 quadrature output on my Shizuoka mill: > > http://www.wallacecompany.com/machine_shop/Shizuoka/ > > > > which is used to drive the steppers in half-step mode. Basically, there > > is just an amplifier between EMC2 and the stepper. > > > > > If you ever find an odd function in EMC2, you can be sure Kirk uses it. :) > Kirk, what are the optointerrupters for? > > --S
If you mean here: http://www.wallacecompany.com/machine_shop/Shizuoka/Shizuoka_Step_Drv-1a.png (Short URL) http://preview.alturl.com/fmdb these are on the original stepper drivers. On the PC side, I have a 74ls244: http://focus.ti.com/lit/ds/symlink/sn74ls241.pdf that provides enough power to drive the LED in the opto-interrupter (/coupler). I like to have an opto-coupler somewhere in the connection between the PC and the outside world to help prevent damaging the PC. Early on, I blew out a motherboard parallel port, which bothers me to no end. Now, I try to use cheap PCI parallel port cards and opto-couplers, so I don't make the same mistake again. Plus, the couplers come in handy for voltage conversion. My guess is, one volt of noise on a 12 volt signal is less of a problem than on a three or five volt signal, the coupler makes it easy to convert the machine signal voltage to what the parallel port needs. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
