GATE ME 2021 Set 1 — Question 51
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Manufacturing Processes → CNC & Work Holding → NC & CNC Machines
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Question
The table of a NC machine tool is to move from to ; all coordinates are in mm. The pitch of the NC drive leadscrew is 1 mm. If the backlash between the leadscrew and the nut is , then the total backlash of the table on moving from to is ________ mm (round off to two decimal places).
Correct answer
0.2 to 0.3
Solution
Distance moved: from to the table moves mm along (no motion along ).Leadscrew revolutions: with pitch mm,Backlash per revolution: an angular backlash of corresponds to a linear lost motion ofTotal backlash over the move (accumulated over every revolution of the leadscrew, as intended in this question):Answer: mm
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