Question

Which of the following is not true about first order irregularities?

(a) Arising due to irregularities in machine tool itself

(b) Arising due to weight of material itself

(c) Arise due to vibrations

(d) May arises due to deformation of work under action

I have been asked this question by my school teacher while I was bunking the class.

My doubt stems from Meaning of Surface Texture topic in division Measurement of Surface Finish of Engineering Metrology

Answer 1

Right option is (c) Arise due to vibrations

Explanation: First order irregularities includes the irregularities arising out of inaccuracies in the machine tool itself. This includes the irregularities on surface arising due to work deformation under the action of cutting forces and the material weight itself.