RE: Arc resolution in EMC

["Barry E. King" <beking-at-home.com>]

Thanks Max.

I just checked the sources.  If I am seeing things correctly, one could
modify rs274_ini_load in rs274ngc.cc to add support for load a tolerance
value and replace references to the TOLERANCE_XX macros with a global
variable reference.  It appears there is already a global that is set
there - RS274NGC_PARAMETER_FILE.

I am not intimately familiar with the overall architecture or design
philosophy of EMC so I am not sure that this is the correct place to put
this or how it may impact other operations.  I did notice a conditional
compile about possible standalone operation and am not sure what that is all
about.

It seems feasible to modify and does seem to be a valid candidate for a
configurable parameter since programs that generate G-code consider this
configurable.


Regards,

Barry

> -----Original Message-----
> From: emc-at-nist.gov [emc-at-nist.gov]On Behalf Of Maximilian HEISE
> Sent: Wednesday, November 21, 2001 5:18 AM
> To: Multiple recipients of list
> Subject: Re: Arc resolution in EMC
>
>
>
> Hi Barry,
>
> > emctask.cc 245: rs274gnc_error: Radius to end of arc differs
> from radius to
> > start
>
> I had the same problem a while ago.
> Look at src/rs274ngc_new/rs274ngc.hh at the beginning an decrease these
> values.
>
> /* numerical constants */
> #define TOLERANCE_INCH 0.0002
> #define TOLERANCE_MM 0.002
>
> Once you have changed them => recompile.
>
> Could somebody please but this in the handbook. It keeps coming
> up every once
> in a while and costs time for almost everybody who uses generated gcode.
>
> >Seems to me this should be a configurable setting.
> I agree with you. How much work is it to put this as variables in the ini
> file ? Everybody (like me ...) is lazy and once the problem is fixed for
> somebody it is up to next person to discover it again ;-)
>
> >Is it MAX_ERROR and if so, what exactly is the impact of setting this >
> >variable?
> No it is not MAX_ERROR. MAX_ERROR is the maximum allowed error
> between actual
> and commanded position. Once MAX_ERROR is exceeded EMC goes into estop
> because something is wrong.
>
> Regards
> Max
>
> --
> Max Heise <max.heise-at-gmx.net>
> Student Mechatronik/Automatisierungstechnik FHT Esslingen
> PGP public key from:
> http://www.fht-esslingen.de/~mahemt01/pgp50i.pub or any keyserver
>
>
>