Question

What is the accuracy of surface straightness in angle plates?

(a) ±0.001 mm in 25 mm length

(b) ±0.01 mm in 25 mm length

(c) ±0.04 mm in 25 mm length

(d) ±0.004 mm in 25 mm length

I got this question during an interview.

Query is from Angle Plates in portion Linear Measurements of Engineering Metrology

Answer 1

The correct option is (a) ±0.001 mm in 25 mm length

The explanation is: High accuracy of straightness is needed as straight planes are the basis for measurement works. Angle plates have ±0.001 mm in 25 mm length surface straightness.