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GATE 2022 ME (ME1) – Question 19

Computer Aided Manufacturing and Automation · NC/CNC machines and CNC programming · 1 mark · Multiple choice

A CNC worktable is driven in a linear direction by a lead screw connected directly to a stepper motor. The pitch of the lead screw is 5 mm. The stepper motor completes one full revolution upon receiving 600 pulses. If the worktable speed is 5 m/minute and there is no missed pulse, then the pulse rate being received by the stepper motor is

  1. 20 kHz
  2. 10 kHz
  3. 3 kHz
  4. 15 kHz

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Correct answer: (B) 10 kHz

Explanation

The table speed is $5000$ mm/min $= 83.33$ mm/s. With a 5 mm pitch the screw turns at $\frac{83.33}{5} = 16.67$ rev/s. At 600 pulses per revolution the pulse rate is $16.67 \times 600 = 10000$ Hz $= 10$ kHz.