If someone is interested in integrating this work with LinuxCNC I
welcome your efforts.  Unfortunately, the work is presented not as a
patch but as copies of whole files from an unspecified version of
LinuxCNC, which makes it difficult to integrate with the current version
of LinuxCNC.

A second difficulty is that the #1 parameter should not be used in this
way.  I don't know whether a numbered parameter from the "reserved"
space should be used, or a new modal code.  But using #1 in this way
will change the meaning of many existing part programs.

I have uploaded the original attachments to my website:

As far as I know any of you are welcome to contact prof. Lo Valvo or his
student Mr. Drago.


> From: Ernesto Lo Valvo <ernesto.lova...@unipa.it>
> To: Jeff Epler <jep...@unpythonic.net>, ch...@timeguy.com
> Cc: "sd2...@libero.it" <sd2...@libero.it>
> Dear Sirs,
> we are pleased to inform you that a new control for the processing of 
> the NURBS has been developed through the working up of our preceding job 
> on the implementation of the NURBS in LinuxCNC 
> (http://wiki.linuxcnc.org/cgi-bin/wiki.pl?NURBS).
> In particular, we managed to develop the command G6.2 which takes as 
> input the same parameters command of NURBS interpolation accepted by 
> FANUC Numerical Controls.
> In addition, the command has been optimized as to allow the user to 
> select, by using a parameter, the modality to generate the path tool.
> In particular, it is possibile to select three different modes:
> a)         # 1 =1 NURBS interpolation with constant increments the u 
> parameter (parameter # 1 =1 must precede the opening code G6.2 ); the 
> mode according to which is generated the trajectory tool is similar to 
> the current version (G5.2 /G5.3 ) and much faster than it (example in 
> the attachments).
> b)         # 1 =2 NURBS interpolation with increments of constant 
> displacement through circular motion (example in the attachments).
> c)         # 1 =3 NURBS interpolation with increments of constant 
> displacement through linear movement (example in the attachments).
> The command implemented in options # 1 =2, # 1 =3 generates the path 
> tool with constant increments of movement so to permit the percentage 
> variations of feed-rate, as shown in the pdf enclosed.
> Moreover, we manage to develop a macro in Rhinoceros 4.0 capable of 
> writing the commands in the new format by selecting an existing curve. 
> You will find the source code useful for the implementation, some 
> example files and macros in Rhinoceros 4.0, in the attached file.
> It is our intention to write a scientific article on the topic that will 
> contain in details the procedure developed.
> If you think that this work could be useful for you, we will be honoured 
> of a future addition of it in the next versions of LinuxCNC through the 
> way you feel being the most appropriate.
> Your suggestions or hopinions are greatly appreciated.
> Cordial greetings
> prof. Ernesto Lo Valvo
> student Stefano Drago.
> -- 
> ATTENZIONE: Il mio nuovo indirizzo email รจ
> ernesto.lova...@unipa.it
> From:    Prof. Ernesto Lo Valvo
> Dipartimento di Ingegneria Chimica, Gestionale, Informatica e Meccanica
> Universita' di Palermo
> Viale delle Scienze
> 90128     Palermo (Italy)
> Tel: +39-091-23861845 (direct)  - Fax: +39-091-6657039

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