On Thursday 16 February 2017 02:20:30 Valerio Bellizzomi wrote: > 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_Ha > > > > >rdwa 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 > Thats a bummer. Maurius L., or Andy, is there not someone on your side of the pond that could get it there faster for when the next time comes up?
Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
