> From: mai...@mah.priv.at
> Date: Sat, 18 May 2013 14:45:47 +0200
> To: emc-developers@lists.sourceforge.net
> Subject: Re: [Emc-developers] Wear Offsets (was lathe-style tool patch)
>
>
> Am 18.05.2013 um 13:24 schrieb andy pugh <bodge...@gmail.com>:
>
> > On 18 May 2013 06:15, Michael Haberler <mai...@mah.priv.at> wrote:
> >
> >> tools(toolid, length, diameter, other-non-offset parameters)
> >> offsets(offsetid, xoffset,yoffset..., purpose) (purpose could be:
> >> coordinate system offset, wear, tool holder..)
> >>
> >> then you have a relation describing the active offsets, which is 1:N in
> >> nature (a tool can have an arbitrary number of offsets or none at all):
> >>
> >> tooloffsets(toolid, offsetid) (only toolid is a primary key)
> >
> > I think toolid is the wrong primary key there, assuming that primary
> > keys are unique. I think that the "relation" (if I have my technical
> > terms correct) is
> >
> > tooloffsets(tooloffsetid, toolid, offsetid)
> >
>
> you are right, good find - what needs to be unique is the tuple {toolid,
> offsetid}
>
>
> > To take a concrete example, tools 11 and 22 both with offsets 33 and
> > 44 applied would be:
> > tooloffsetid toolid offsetid
> > 1 11 33
> > 2 11 44
> > 3 22 33
> > 4 22 44
>
How do you handle 'tool groups' with this?
What I mean is if you have a group of tool 1 that are interchangeable because
of wear or breakage.
In the Gcode you would ask for tool 1133 (tool 1 offset 33) but the toolfile
must be able to hold
the fact that there are two tool 1s.
Chris M
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