The answer would be no to the slow axis issue. All axis on this machine will
run a linear 250ipm. The problem is in the brains of the thing. It only has
5 lines of "Look Ahead". The way the arcs are being programmed is the issue.
Because the arc radius is not consistant throughout the profile of the cut
there are various arcs attached to one another through the cuuting path.
Each change in radius has to be recalculated by the control. At least this
is how Fanuc explained it to me. Because we already have the max look ahead
for this control our only option is to retro fit the control to something
else. This is the only machine in the shop that this issue is this severe.
Dave
----- Original Message -----
From: "ben lipkowitz" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Sent: Sunday, October 21, 2007 10:25 PM
Subject: Re: [Emc-users] Starting a new project
> On Sun, 21 Oct 2007, Dave Keeton wrote:
>
>> How does this control handle 3d interpolated arcs? Anyone know? The
>> reason I am asking is we have a machine that has a Fanuc10M control on
>> it. It goes from 80ipm down to about 20ipm while cutting these arcs.
>> Almost all profile cutting on landing gear is done this way.....It's
>> killing our job rates....going to bed now.....Dave is tired!
>
> Currently emc only handles arcs in the xy xz and yz planes, but this is
> more of a limitation of g-code than the way emc is built. It does blend
> arcs together quite nicely as you can see here at the bottom of the page:
> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TrajectoryControl
>
> The yellow lines are deviations from the programmed path to satisfy
> the acceleration constraints.
>
> Does your machine have a slow axis on it? I was mucking around with the
> arc code today, and it seems that emc will use the acceleration of the
> slowest axis involved in an arc move, which is sub-optimal. It shouldn't
> affect a smoothly contoured part very much though.
>
>
>>> You could use the program halcmd to link buttons in tkemc to signals
>>> connected to ladder inputs. You'll need a bit of tickle language to do
>>> that but this stuff can be hacked together from a couple of other Tcl/Tk
>>> programs already in the source.
>
> I would suggest at least looking at the HAL system and pyvcp ("virtual
> control panel") before trying to mess around with Tcl.
>
> -fenn
>
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