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What is the compensation for angle error?

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What is the compensation for angle error?

(a) ΔE=3p*ΔΘ/100

(b) ΔE=p*ΔΘ/100

(c) ΔE=p*ΔΘ/50

(d) ΔE=p*ΔΘ/200

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This interesting question is from Screw Thread Gauge Tolerance topic in portion Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

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Right choice is (a) ΔE=3p*ΔΘ/100

For explanation: The compensation for angle error, ΔE is related to the pitch p as follows: ΔE=p*Θ/100  where ΔΘ is the angle error in degrees. It is necessary that ΔE and p should be expressed in the same measure, i.e. English or metric. The angle error is the arithmetical sum of the errors of the two flank angles irrespective of their signs.

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