Re: gEDA-user: kicad/gerbview vs. pcb/gerbv: interpretation of "Circular Interpolation"

[Dave N6NZ <n6nz@xxxxxxxx>]

Yeah.  I can't imagine a modern photo plotter having trouble with it.  

In CNC code, doing a circle cut in arc segments is considered 'good practice' by some, since a machine controller will only pause between lines of G-code. If a circle is done as quadrants, then if something goes wacky you can pause the machine between quadrants.  Otherwise your only option is the E-stop button, where you lose position and probably the work piece also.  Not an issue for photo plotters. 

Maybe that is where the bug report originated?  Somebody commenting on G-code 'best practices'? (Which I agree don't necessarily apply to gerbers...)

-dave

On Aug 31, 2010, at 1:02 PM, DJ Delorie wrote:

> 
> PCB uses the G02/G03 codes that way too.
> 
> My point was, if RS274X has a way to differentiate between 135 degree
> arcs and 225 degree arcs, that same way should work for 315 vs 45.
> 
> I suspect the one-quadrant format is ancient, and people added the
> multi-quadrant format to "fix" and replace it, but never deprecated
> the older one.
> 
> 
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