> Date: Fri, 13 Sep 2013 14:54:04 -0500
> From: sa...@empirescreen.com
> To: emc-developers@lists.sourceforge.net
> Subject: [Emc-developers] Some trajectory testing between mach and linuxcnc
>
> I finally did it..
> I installed mach3 on an xp machine and setup a machine.
> I setup linuxcnc and mach with all 3 axis set to 500ipm and 30 in/sec/sec.
>
>
> Well there you go.. It seems to be with strait G64 - linuxcnc 1 segment
> lookahead seems to be the limiting factor. There is some situations
> that the G64 Px.xxx will improve the path speed. (longer line segment
> means higher peak velocities.) This also suprised me - both mach and
> linuxcnc must be using very similar trajectory planning maths.
>
> High speed machining/routing/whatever with short line/arc segments is
> only possible at the moment with linuxcnc on high acceleration
> machines. (I had to set the acceleration to over 450in/sec/sec to get
> the velocitys up to 400ipm)
>
> In my opinion - this should be a priority. (and I know it is probably
> going to be a lot of work) (and about all I can do is test)
>
>
> Discuss... (of course I could be missing something obvious) (A work
> around perhaps?)
>
> sam
Hey Sam thanks for doing this and posting it to the maillist for everyone.
Finally a no assumptions comparison!
While I had no doubt the Mach guys weren't making it up, now we can
say yes you do have a faster feed on certain short segment Gcodes.
I personally agree that this should be a higher priority feature.
And like you I don't know what this entails to actually do.
I wonder if some one with linuxcnc trajectory experience could spell
out how this part of the trajectory planner works and what problems
/amount of work etc there would be to add look ahead.
I think the fact that the trajectory planer is uncharted 'black magic'
that holds back it's further development. With some help maybe I could
start a current description in the wiki ....
Chris M
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