1. Explain the difference between numerical control and computer numerical control 2. What is the first step in preparing the program on a NC machine? 3. What do the following expressions mean? a) N100 G01 G81 Z-1.5 F2100 b)N55 G00 G91 XO YO M3 4. Why is compressed air required for the CNC mill in the lab? 5.
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