Question

Calculate the punch size in mm, for a circular blanking operation for which details
Size of blank $25$ mm
Thickness of the sheet $2$ mm
Radial clearance between
Punch and die $0.06$ mm
Die allowance $0.05$ mm

• A. $24.83$
• B. $24.89$
• C. $25.01$
• D. $25.17$

Answer 1

The correct option is A $24.83$

Diameter of punch = Diameter of blank $-2\times$ Radial clearance - Die allowance
$=25-2\times 0.06-0.05=24.83$ mm