Hi,
You should try the "continuos mode" using G64 P- in the g-code program. With
the parameter P you can specify (optionally) a requested tolerance.
The NIST specification says:
"In continuous mode, sharp corners of the path may be rounded slightly so
that the feed rate may be kept up"
So I think this is what you need.
I'm also modifying the EMC2 source code in order to let it accept a new
G-code that defines nurbs curves on plane. Those will be approximated by
biarcs, as suggested first by Jeff Epler. Biarcs are couple of tangent arcs.
Each biarc is tangent to the following, this results in a curve with
continuous tangent, allowing a high feedrate than small segments. The
modify is still a work in progress...
Regards,
Manfredi Leto
My websites: www.m24-pro.com
www.emc2cnc.altervista.org
>From: Jon Elson <[EMAIL PROTECTED]>
>Reply-To: "Enhanced Machine Controller (EMC)"
><emc-users@lists.sourceforge.net>
>To: emc-users@lists.sourceforge.net
>Subject: Re: [Emc-users] [geckodrive] EMC vs. Mach3 Constant Velocity??
>Date: Wed, 08 Aug 2007 11:11:09 -0500
>
>The following message was sent to the Geckodrive Yahoo group. I
>don't have enough experience with CV contouring to answer this
>authoritatively, anyone else want to take a crack at it?
>
>The group is > http://groups.yahoo.com/group/geckodrive/
>
>
>David Bloomfield wrote:
> > I've been running more and more complicated programs lately that are
> > composed of many short line segments. Mach3 has a terrible time with
> > these programs and the actual feed is usually WAY less than the
> > commanded feed. This leads to long machining times and it's very hard
> > on the cutters. Does anyone have experience with EMC 2.0 and it's CV
> > mode? I really like Mach3, but If EMC has a better control method I
> > would gladly switch over. Art said at one time he was going to work
> > on a method to convert the line segments into NURBS to speed things
> > up, but I think that idea was placed on the back burner.
>
>-------------------------------------------------------------------------
>This SF.net email is sponsored by: Splunk Inc.
>Still grepping through log files to find problems? Stop.
>Now Search log events and configuration files using AJAX and a browser.
>Download your FREE copy of Splunk now >> http://get.splunk.com/
>_______________________________________________
>Emc-users mailing list
>Emc-users@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/emc-users
_________________________________________________________________
FREE pop-up blocking with the new MSN Toolbar - get it now!
http://toolbar.msn.click-url.com/go/onm00200415ave/direct/01/
-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems? Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
