Question

Which of the following is not true about tool maker’s flats?

(a) Tool maker’s flats should be free from inclusions

(b) Tool maker’s flats are of less hardness

(c) Working surfaces are produced by lapping

(d) Should be located in a stirred atmosphere

I got this question in homework.

The doubt is from Tool Maker’s Flats and High Precision Surface Plates topic in portion Linear Measurements of Engineering Metrology

Answer 1

The correct option is (b) Tool maker’s flats are of less hardness

For explanation: Tool maker’s flats should be free from inclusions which after proper heat treatment gives a high hardness. Working surfaces are finished by lapping to possess a high degree of accuracy and uniformity.