My current spindle is very low tech, a bosch colt. I would use a 4-20ma amp donut, perhaps wind a couple extra loops.
I'll have to think this over a bit. It is one thing to write a driver when you have complete docs, yet another when you have to search so many places for all the information. Managing this with a pic32 would be a piece of cake, its just the dev time that holds me back. On Tue, Feb 7, 2012 at 2:59 AM, andy pugh <bodge...@gmail.com> wrote: > On 7 February 2012 01:34, Erik Friesen <e...@aercon.net> wrote: > > I feel like I'm fumbling a bit for information on the mesa cards. Is the > > firmware open source? How does one go about configuring the card? I > have > > a bit of experience with embedded electronics, but working with this is a > > bit new to me. How configurable is the spi? > > The SPI is a bit too configurable, and in effect you have to write a > sub-driver for any specific new hardware. > There is a tool in LinuxCNC for writing real-time drivers and > components called comp > http://www.linuxcnc.org/docview/html/hal_comp.html > To use the Mesa-card BSPI modules you need to write yourself a > realtime component using comp. Currently there is only one example > which is used by another Mesa card (the 7i65 8x servo control card) > > http://git.linuxcnc.org/gitweb?p=emc2.git;a=blob;f=src/hal/drivers/mesa_7i65.comp;h=41bcc37e2a9ab42c4cc00547a20955f7624650a1;hb=HEAD > That card has 8x analogue inputs and 8x analogue outputs handled by > on-board SPI devices. > > I think that, for your requirements, a Pico or Mesa board to handle > the encoder counting and realtime stuff and a USB-connected Arduino > would work well. > > Bear in mind that even with an encoder the best you can do with > steppers is detect a stall or missed steps, recovery isn't really > possible as driving a stepper harder == faster only makes things > worse. > > -- > atp > The idea that there is no such thing as objective truth is, quite simply, > wrong. > > > ------------------------------------------------------------------------------ > Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
