RE: [CAD_CAM_EDM_DRO] Geometry Problem

Two books with this information:

1. CNC Machining Handbook, James Madison, Industrial Press
2. Computer Numerical Control, S.C. Jonathan Lin, ITP

Lin discusses matrix transformations. Madison has about ten pages of
formulae that are useful in developing tool offset algorithms.

Doug

> -----Original Message-----
> From: Harrison, Doug [SMTP:dharrison@...]
> Sent: Wednesday, March 29, 2000 10:20 AM
> To: 'CAD_CAM_EDM_DRO@onelist.com'
> Subject: RE: [CAD_CAM_EDM_DRO] Geometry Problem
>
> From: "Harrison, Doug" <dharrison@...>
>
> Ron;
> I worked on this same problem for two years. About the time I got all the
> equations derived someone handed me a book containing this information.
> The
> book vanished but not before I was able to get the ISBN and have the
> library
> order one. I'm headed over there in a little while and will get the
> title.
>
>
> Doug
>
> > -----Original Message-----
> > From: Ron Ginger [SMTP:ginger@...]
> > Sent: Wednesday, March 29, 2000 9:38 AM
> > To: CAD_CAM_EDM_DRO@onelist.com
> > Subject: [CAD_CAM_EDM_DRO] Geometry Problem
> >
> > From: Ron Ginger <ginger@...>
> >
> > I am trying to add another feature to my CNC program, and am stumped on
> > a geometry problem, maybe someone here has an answer.
> >
> > I want to handle the transition between 2 line segments. Assume I have
> > points X1,Y1 as the start of a line, X2,Y2 as the end of the first line
> > and start point of the second, and X3,Y3 as the end of the second
> > segment. I also know to mill either to RIGHT of the line or LEFT.
> >
> > If I am on the outside of a corner, I want to do and arc, with the
> > center at X2,Y2 and start and end point determined by the tool offset. I
> > know how to do all this.
> >
> > If I am on the inside of the corner I need to find the intersection of
> > the two tool paths and stop at that point. I know how to do this as
> > well.
> >
> > What I cannot figure out is how to tell which case I have. So, given the
> > 3 points and an offset of right or left, how do I tell which kind of
> > corner I have?
> >
> > thanks for any hlep,
> >
> > ron
> >
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> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems in the above catagories.
> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
> Log on, and you will go to Member Center, and you can make changes there.
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