On Saturday 27 October 2018 17:30:42 Gregg Eshelman via Emc-users wrote: > PCIe to SPi 'demo board'. > https://www.asix.com.tw/products.php?op=pItemdetail&PItemID=256;74;110 >Docs and drivers at the bottom of the page > > On Saturday, October 27, 2018, 1:43:43 AM MDT, Gene Heskett > <[email protected]> wrote: > > The spi port on the pi is faster, but I've not found an spi card for > x86 machinery yet.
But you have to add the latency of the ethernet connection, adding 10 to 50 u-secs of random lag. That cannot be tolerated by a stepper motor if any speed is expected. And if the computer is good, the stock parport can step a motor directly. You can tolerate more lag, but that translates directly to how fast the motor can be driven without any stalling. Eventually you're down to about 8" a minute, and thats comparable to watching paint dry or grass grow. Just right perhaps for precise EDM work which I have done on that slow machine. > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -- 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> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
