Question

This tutorial Assignment 1 is concerned with producing machine codes for a generic CNC mill by manually writing the program. Use only trigonometry and manual calculations to determine the path of the tool. Do NOT use a CAD system to create the code nor for working out the geometry. The item shown below is to be machined out of aluminum stock, but the roughing cuts, leaving 1.0 mm all around, and the 15 mm diameter holes can be assumed to be done previously. Remember, the path of the center of the tool is what’s required.

Questions:

Draw a freehand sketch (do NOT use CAD or a ruler) of the object showing where the “program zero”is defined and include any machining instructions that would be needed for the CNC machine operator. This has to include how the job would be held to the machine table for this finishing cut. Choose a tool type and size that you think is most suitable for the job and the instructions for the machine operator has to include the tool details.

Write an NC program fragment, using ONLY the codes shown below, to do just the finishing cut around the contour of the shape drawn. Assume that the thickness is 20 mm.

The hole

Note: A=1 ; B = 3

If this piece is to be modeled using a CAD/CAM system and a suitable postprocessor were made available, what would be the differences in the way you would create the machine program (G & M program) compared to manual programming?

G00 -
G01 -
G02 -
G03 -
M03 - start spindle CCW M00 - stop program

rapid travel
linear move
cw circular move ccw circular move

160+A SECTION B-B 30+ 50+B 25+B 40+B SECTION A-A

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