Question

Which of the following is true regarding high precision surface plates?

(a) The top of high precision plate projects about 32 mm beyond the framing

(b) The top of high precision plate projects about 32 mm below the framing

(c) The top of high precision plate projects about 12 mm beyond the framing

(d) The top of high precision plate projects about 12 mm below the framing

I have been asked this question in an interview for internship.

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

Answer 1

Right answer is (c) The top of high precision plate projects about 12 mm beyond the framing

Easy explanation: The top of high precision plates is machined around the sides and generally projects approx 12 mm beyond the framing.