On Wed, 2017-02-15 at 14:32 -0500, Gene Heskett wrote: > On Wednesday 15 February 2017 14:13:17 Valerio Bellizzomi wrote: > > > On Wed, 2017-02-15 at 12:45 -0600, dragon wrote: > > > The 20ma control circuit on the VFD is an analog control, where as > > > the parallel port pin is a digital (on/off) signal. You will need > > > some sort of hardware interface between the two to do a digital to > > > analog conversion. > > > > is there a list of supported hardware, that I could buy on ebay ? > > I was looking at > > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNC_Supported_Hardware > > > > I have already 3 stepper drivers mounted in a metal box with their > > power supply, I would need only a small interface for the spindle. > > Using software stepping? I'd still use a pwmgen module in the computer to > drive the vfd, but I'd put a SpinX1, from Mesa between them, for the > noise isolation (vfd's are noisy electrically), and the control is quite > linear. I would put the pwmgen in the PDMgen mode, see the man page as > that removes the need to dither the pulse width because each step is > fixed, the dither keeps it at the requested speed. But with PDM, you > don't need the dither. With SW pwmgens, I'd choose a refresh rate below > the servothread by about half, the vfd shouldn't mind.
I have checked out the mesa store, it is a problem for me that they do not have paypal transactions among their choices for payment, I do not own a credit card is there another way to purchase say a spinx1 or equivalent board ? ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
