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What is the nature of the graph between cumulative pitch error and length of thread in case of progressive pitch error?

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What is the nature of the graph between cumulative pitch error and length of thread in case of progressive pitch error?

(a) Straight line

(b) Parabolic

(c) Hyperbolic

(d) Exponential

I have been asked this question in an online quiz.

My enquiry is from Effect of Pitch Errors topic in portion Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

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Best answer
Right choice is (a) Straight line

The best I can explain: Progressive pitch error can be caused due to pitch error in any generating machine or in the lead screw of a lathe. The graph between cumulative pitch error and thread length in progressive pitch error is a straight line.

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