On Wed, 2017-02-15 at 19:13 -0500, Gene Heskett wrote: > On Wednesday 15 February 2017 15:12:17 Valerio Bellizzomi wrote: > > > 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_Hardwa > > > >re > > > > > > > > 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 ? > > > There are actually 2 web stores, one by Peter C. Wallace, out on the left > coast, and Big John Thortons's site in southern Missouri. I am pretty > sure either would take a check or money order. Big John ships the same > day if he has it, 3 days to West Virginia is the worst he's done to me. > I would imagine your money order would not be much slower. Another day > perhaps. > > Cheers, Gene Heskett
Thanks Gene, I have already ordered one spinx1 here http://mesaus.com/index.php?route=product/product&product_id=91 I guess it will take a month or so as I live in Italy ------------------------------------------------------------------------------ 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
