On Thu, Mar 03, 2011 at 11:25:19PM -0600, Jon Elson wrote: > Well, shows how out of date I am! But, doesn't that cause a gouge? I > got used to using arcs on inside corners to > avoid the gouge and cutter load increasing on them. Or, does the > trajectory compensate to avoid the gouge? > If so, it seems like it would HAVE to insert an arc segment between the > two straight lines.
No, it doesn't gouge the part outline. It moves along the path on the specified side. Every adjacent pair of moves (whether line or arc) cause a concave or convex corner. If the corner is concave, it calculates a new corner point that puts the tool inside and tangent to both. If it is convex, it makes an arc around the corner. You can still get the gouging error if you program *three* moves where placing the tool tangent to moves 1,2 causes it to gouge 3. This can happen if move 2 is short compared to the tool: -> O _____,| Imagine the , is a tiny move in the corner, that the large tool O can't touch without cutting into _ or | moves. This will give a gouging error. Some CAM systems unfortunately generate this. Like Igor said earlier, using a smaller tool can cause this gouging error to go away because the , move becomes reachable. (It also minimizes the leftover fillets of course.) > I rarely use the G41, G42 offsets, I have my little C programs that code > the paths I need without using tool > radius offsets, so I am rusty. You should try it again! Chris ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
