On Sat, Jul 31, 2010 at 11:06 PM, Jon Elson <[email protected]> wrote:
> Don Stanley wrote:
> > 3- While checking the G00 move speed on the Z axis
> > with the pertinent .ini settings below;
> > EMC 2.3.0 G00 moves the Z axis approximately 60 inches /minute.
> > EMC 2.3.5 and 2.4.2 G00 moves the Z axis approximately 15 inches /minute.
> > Feed is set f100 but shouldn't matter.
> >
> > [TRAJ]
> > LINEAR_UNITS = inch
> > DEFAULT_VELOCITY = 1.0
> > MAX_VELOCITY = 1.0
> > DEFAULT_ACCELERATION = 1000.
> > MAX_ACCELERATION = 1000.
> >
> > [AXIS_0]
> > TYPE = LINEAR
> > MAX_VELOCITY = .25
> > MAX_ACCELERATION = 500.0
> >
>
Hi Jon:
> You have your X axis set for a maximum velocity of .25 inch/second, or
> 15 IPM.
I am just getting started in PIDs setup, X first. The first thing I noticed
is
"the faster moves were more unstable in the starts, stops and travel".
So this was a first cut at keeping X axis.0.f-error within acceptable
limits.
This speed would be minimum acceptable for G00 moves of the cross slide.
However 15 IPM would be very painful to watch on a 40 inch G00 Z move.
Not sure exactly why this affects Z also.
>
The best I can tell so far it came with EMC 2.3.5 and stayed with 2.4.n.
So far testing indicates the following:
[TRAJ] DEFAULT_VELOCITY affects nothing.
[TRAJ] MAX_VELOCITY sets jog speed.
[AXIS_0] MAX_VELOCITY sets max velocity for all axis
[AXIS_2] MAX_VELOCITY can set less than axis_0 but not more.
Also, do you have any idea how much acceleration 1000 inches/second^2 is
> ? I use numbers around 3-5.
>
Its a bunch more than the motors can do. When I tried reasonable numbers
the start and travel axis.n.f-error started wandering and less stable.
On hal scope the extreme acceleration kicks the motors full output which
produces less axis.n.f-error. With 127 pound mass on the cross feed and
475 pound mass on the carriage the error builds up quickly if I don't give
it the maximum kick to start.
If it appears I don't know what I'm doing; that's what I think.
None of the documented procedures seem to work on my system.
So I have resorted to poking it to death and see if it will yield.
If anyone sees a better way, please advise me.
Thanks
Don
>
>
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