Discussion
What is the recommended cutting speed for the drilling machine for drilling in thermo-setting plastic?
Answer: B
The recommended cutting speed for drilling depends on the material being drilled. For thermo-setting plastic, the key gives a cutting speed of 20 to 30 metres per minute, option (B). A speed of 5 to 8 m/min is used for harder metals, and the higher speeds of 40 to 50 and 70 to 100 m/min would overheat the plastic and the drill, and burn or crack the material. The key is followed for this recall item. Plastics are drilled at moderate speeds with sharp drills, and the thermo-setting kinds are hard and brittle, so too high a speed would burn and crack the material.
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