Question

A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. the diameter of the punch should be. (take clearance as 3% of disc thickness).

49.94 mm 

50.00 mm 

50.075 mm 

none of these

Answer 1

I don't know............

Answer 2

Answer:

1st Option is correct.

Step-by-step explanation:

Given:

Diameter of disc = 50 mm

Thickness of disc = 1 mm

To find: Diameter of the punch

According to the Question,

The diameter of punch = diameter of disc - 2 × clearness

here it is given that ,

clearance = 3% of disc thickness

                = 3% × 1

                = 3/100 × 1

                = 0.03 mm

⇒ The diameter of punch = 50 - 2 × 0.03

                                           = 50 - 0.06

                                           =  49.94 mm

Therefore, 1st Option is correct.