On Thursday 15 September 2016 12:16:45 Chris Albertson wrote: > Hello, > > Got a "new" computer I saved from going to the dump. II am going to > it use for LinuxCNC. I tested latency for a good 30 minutes and got > just under 30,000 over 20,000 on the display. The PC is an Intel i7, > 2.67 GHz, 4GB RAM and no built-in graphics on the mother board. There > is a video card in one of the slots. One PCI slot is free. > > I want to run some NEMA 23 stepper motors to control a Sieg X2 mill. > (aka "Mini Mill".) Yes, call it a "toy" but the parts I want to make > would fit on your open hand. I have a rotary table I am converting > also and hope one day to be able to do 4-axis work. > > Questions: > > 1) Is it worth it to experiment with different video drivers and such > to reduce the latency? The numbers look good enough already, I think. > Not for moving steppers at usable speeds.
> 2) What would I gain by using a Mesa card over a parallel port card? > I don't have either one of these now and would need to buy one or the > other and with only one PCI slot I can use only one card. A mesa 5i25 with a 10 dollar breakput board on the other end of a parport cable essentially removes the boxes latency from the equation because all you will need is the much slower servo-thread. I still have one software stepper driven machine, and its slow, and z now misses pulses at a maxvel it was happy with at ubu8.04 LTS. So I intend to put one of the 5i25's in it before too long. Its in a box on the floor beside this chair right now. I have the exact same motor on my toy lathe, and with a 5i25 issuing the marching orders it can do 60 ipm without losing a step. The software stepping machine is an identical intel D-525-MW, but no 5i25. 8 ipm is the speed limit if I don't want it to lose steps. Thats a huge difference. Best dollars you will spend. 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
