Question

Which of the following statement is incorrect about adjustable thread gauges?

(a) It is used for precision gauging purposes

(b) It shows more gauge wear than solid gauge wear

(c) It overcome the disadvantages by solid gauge wear

(d) Its wear allowance is 0.0125mm

This question was posed to me in an interview for job.

Enquiry is from Gauge Wear topic in division Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

Answer 1

Right option is (b) It shows more gauge wear than solid gauge wear

For explanation I would say: In order to overcome the disadvantages of solid gauge wear,  the adjustable pattern screw thread gauge was evolved which is widely employed for precision gauging purposes. Although wear can be compensated for but the B.S. allowance of 0.002″ (0.005mm) for solid gauges is reduced by about 0.0005″(0.0125mm).