CNC Milling in the Workshop by Marcus Bowman

Author:Marcus Bowman
Language: eng
Format: epub
Publisher: Crowood
Published: 2014-06-11T04:00:00+00:00

Fig. 6-10 Columns remaining in a recess due to too large a tolerance in the allowed deviation from the specified path.

So, the best way to deal with complex 2D shapes consisting of polylines is by drawing the shape in a CAD program, or a compatible vector drawing program, then employing CAM software that uses the mathematical definitions of the polylines to calculate the path for the Controlled Point. The output is G code suitable for the CNC program to drive the mill, but the way in which the CNC program follows the instructions will depend on the G61/G64 commands.

Like the linear shapes in Chapter 5, shapes made with polylines will be profiles or pockets, or combinations of the two, and the same methods can be used to calculate the toolpaths.

For 2D shapes, Cut2D will output G code to allow complex shapes to be machined. Shapes can be drawn directly in Cut2D, so that it acts as the CAD program before taking information about the cutter and calculating the toolpath. For polylines, however, Cut2D is restricted to drawing straight line segments. Its big brothers, VCarve Pro and Aspire, have a more extended set of drawing tools; although you may prefer to use a fully featured drawing program such as Adobe Illustrator, save the drawing and then import it into your CAM program.

Draw the shape shown in Fig. 6-11 directly within Cut2D. Define the material as 50 × 100mm, 1.6mm thick, with the X, Y origin at the bottom left corner.

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