Gene,

That was a good data point:  " 60IPS".   May I ask about the lead screw and
if you are micro stepping?  And the motor size.

I think I'm going to design for a target speed of 100 IPS but if it comes
out 60 I'll be happy.



On Thu, Sep 15, 2016 at 11:55 AM, Gene Heskett <ghesk...@shentel.net> wrote:

> 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>
>
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-- 

Chris Albertson
Redondo Beach, California
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