RE: [CAD_CAM_EDM_DRO] Geometry Problem

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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