By the way, I think that it is great that you let us use cutter compensation while doing inside corners. Every one knows that these corners will have a radius of the end mill, anyway, and this is usually acceptable when pocketing. For perfectly sharp inside corners, after all, we would need to broach, not mill.
i On Fri, Mar 4, 2011 at 6:58 AM, Chris Radek <ch...@timeguy.com> wrote: > 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 Well, shows how out of date I am!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 > ------------------------------------------------------------------------------ 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
