Am 16.02.2017 08:40, schrieb Gene Heskett: > 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 used to be an internet shop in southern Germany, I forgot the address. That's EU, so shipping would last a few days at maximum. PCW should know, for he provided it to me some years ago.
Peter --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. https://www.avast.com/antivirus ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
