GATE ME 2022 Set 1 — Question 19
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Manufacturing Processes → CNC & Work Holding → NC & CNC Machines
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Question
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 mm. The stepper motor completes one full revolution upon receiving pulses. If the worktable speed is m/minute and there is no missed pulse, then the pulse rate being received by the stepper motor is
Correct answer
(B) 10 kHz
Solution
Given:
Pitch of lead screw () = mm/rev
Pulses per revolution () = pulses/rev
Worktable speed () = m/min = mm/minStep 1: Calculate the rotational speed of the motor ():
rev/minStep 2: Calculate the pulse rate ():
pulses/minStep 3: Convert pulse rate to Hz (pulses per second):
Hz = kHz.Therefore, the pulse rate is kHz.
Pitch of lead screw () = mm/rev
Pulses per revolution () = pulses/rev
Worktable speed () = m/min = mm/minStep 1: Calculate the rotational speed of the motor ():
rev/minStep 2: Calculate the pulse rate ():
pulses/minStep 3: Convert pulse rate to Hz (pulses per second):
Hz = kHz.Therefore, the pulse rate is kHz.
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