CALCULATING PUNCH AND DIE CLEARANCE

Any cutting operation performed Punch and Die always have value
clearances are taken.
For thick plate (s) ≤ 3 mm
Us = C.S.
1
τ
Where:
Us
= Allowances for each side (mm)
Dp
Punch = Diameter (mm)
Dd
= Die diameter (mm)
C
= Factor of work (0.005 ÷ 0.025)
S
= Thickness of plate (mm)
τt
= Material shear stress (N/mm2)