lipse, labeled #? In Figure 3, the cutter compensation is turned off and a linear move is done to mill that straight edge. The 1/8” mill then moves to cut out the outside ellipse. This will probably prove to be the most difficult area to fabricate. In order to remove the rest of the inside and to complete the design, a tool change to a ” mill was necessary. The first path of this mill follows the first path of the 1/8”, except that it stops short on the underside so as not to gouge the straight edge. The mill then moves linearly following the red line in Figure 3, to remove the remaining wax on the inside. The dimensions to the design can be viewed in figure 4.Discussion/ResultsThe resulting fabrication shows some room for improvement, but is drastically better than the first dry run shown by the CNC machine. The 1/8” mill didn’t come all the way around the outside ellipse, leaving some wax to be milled at the opening of the “G”. The underside of the design held true as the trickiest part of the fabrication. It looks as though the ” mill was too large for the area we allowed it and the 1/8” didn’t quite react as we planned it to. A slight gouge was created in the last counter clockwise move of the 1/8” mill on the inner ellipse. Another gouge occurred as the ” came around to the underside of the inner ellipse and hit the straight edge. Overall, the fabrication is good. With the exception of those two small areas, the result looks exactly as it was designed. ConclusionThe group would still like to interface the design with the computer and have it draw the part as well. Perhaps this will show what errors in the program the team can avoid and even a better way to fabricate the part altogether. All in all this was a great project for the team to undertake. The group learned a lot about not only the CNC machine, its capabilities and incapacities, but al...
