I had a board running a Celeron that did the same thing. The 2.8G (IIRC)
Pentium had crappier results than the 650MHZ P3 curbside find I am running.
Fix the latency first. You may end up changing building blocks that have a
domino effect on other items (parallel port addresses, etc.)
My .02
Greg
_____
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Chris Morley
Sent: Saturday, June 21, 2008 3:07 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Rookie help
Hi Jack.
What version of emc2 are you using? There was some quirks with stepconf on
earlier versions-make sure you have the latest version.
The latency test is not really to see how slow/fast your computer is, it is
to see how late it is on scheduled tasks.
Sounds like your computer can be really late. You need to fix this before
doing any serious work as it could cause missed steps which will ruin your
work.
> From: [EMAIL PROTECTED]
> To: emc-users@lists.sourceforge.net
> Date: Sat, 21 Jun 2008 09:48:20 -0700
> Subject: Re: [Emc-users] Rookie help
>
> On Fri, 2008-06-20 at 21:59 -0500, Jack wrote:
> > I have EMC2 installed on an old Compaq iPaq desktop running Ubuntu 6.06
from
> > the EMC2 install CD, driving a HobbyCNC controller and gantry with Kirk
lead
> > screws.
> >
> > When I use the sample stepper_inch config it works, but I need to tweak
the
> > configuration some to change the stepping (thread pitch, etc) but when I
try
> > to generate my own using the config tool in Axis, it just doesn't work.
> >
> > Suggestions?
> >
> > I figure this is probably something dumb I am doing, and I am willing to
> > RTFM, I just need some direction.
>
> You might try the pitch change to your working sample file. Just edit
> the SCALE = XXXXXX to match your lead pitch and motor/screw ratio. This
> will change the step rate requirement for a given axis rate, so you
> might reach your stepping rate limit earlier or later.
>
> Compare the working and stepconfig file differences and add each change
> to the working file until it doesn't work, then research the last
> feature you changed.
>
> > With the sample config, it is jogging back and forth OK, but it is not
set
> > for the right threads per inch for the lead screws.
>
> You may be stalling your steppers because the stepping rate may have
> changed. You may need to find the max stepping rate (not axis feed
> rate), then tune different settings to to maximize it. Once you find the
> maximum rate, adjust your maximum axis feed rates to stay below the
> stepping maximums minus a safety factor.
>
> > Once I get this working, next comes home and limit switches and a
hardware
> > emergency switch.
> >
> > The latency test runs, but if I do try to use the computer, sometimes
the
> > numbers go out of sight. 'Normally' it runs about 15000. When it goes
'crazy' It
> > reads over a million. My 500MHz celeron may be to slow, but it is what I
am
> > playing with for now.
> >
> > Thanks. ... Jack
>
> In my opinion, you need to fix the latency test problems first, so that
> you have a stable system that will give you more consistent behavior.
> Check items 2 and 5 here:
>
> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TroubleShooting
>
> and:
>
> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TweakingSoftwareStepGeneration
> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Stepper_Drive_Timing
>
> Another issue that may come up with larger machines, with fine pitch
> screws, high (low?) motor/screw gearing or high feed rates, which
> translate to higher step rates. The PC parallel port tends to be too
> slow. You may need to consider going to a hardware step generator like
> the Pluto-P, Pico UPC, or others.
>
> --
> Kirk Wallace (California, USA
> http://www.wallacecompany.com/machine_shop/
> Hardinge HNC/EMC CNC lathe,
> Bridgeport mill conversion, doing XY now,
> Zubal lathe conversion pending
> Craftsman AA 109 restoration
> Shizuoka ST-N/EMC CNC)
>
>
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