GATE ME 2023 Set 1 — Question 45
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Manufacturing Processes → CNC & Work Holding → NC & CNC Machines
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Question
A CNC machine has one of its linear positioning axes as shown in the figure, consisting of a motor rotating a lead screw, which in turn moves a nut horizontally on which a table is mounted. The motor moves in discrete rotational steps of steps per revolution. The pitch of the screw is and the total horizontal traverse length of the table is . What is the total number of controllable locations at which the table can be positioned on this axis?
Correct answer
(C) 1000
Solution
The resolution or Basic Length Unit (BLU) of the system is the distance moved per step:The total number of controllable locations (discrete steps) over the traverse length is:Alternatively, calculate the total revolutions and multiply by steps per revolution:
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