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Manufacturing Engineering
Machining Processes
GATE 2022
Medium

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

  • A20 kHz
  • 10 kHz
  • C3 kHz
  • D15 kHz

Explanation

Table speed = 5000 mm/min. Screw rev/min = 5000/5 = 1000 rpm = 1000/60 rev/s ≈16.667 rev/s. Pulses/s = 16.667×600 ≈10,000 Hz = 10 kHz.

Source: GATE ME 2022 Session 1 (ME-1) (2022)

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