anvilfire.com flaming anvil trademark logo copyright (c) 1998 Patrick J. Dempsey
     HOME!  |  STORE  |  Getting Started in Blacksmithing  
 
   Guru's Den   
   V.Hammer-In   
   Slack-Tub Pub II   
   Tailgate Sales   
   FAQs   
   Glossary   
   Links   
   NEWS!   
   Plans   
   Armoury   
   iForge How-To    
   Health and Safety   
   Book Reviews    
   eBooks On-line   
   Anvil Gallery   
   Vice Gallery   
  Calendar of Events  
   Story Page   
   AnvilCAM - II   
  Touchmark Reg.  
   Power Hammers   
   What's New   
   Webring Nexus   
   Our Sponsors   
   Members Login   
Daily and Weeky Comics!
  Daily Comic  
Daily Metalworking Comics!
anvilfire.com General Site
Welcome visitor from
United States Flag
United States
Country Counter

Tell them you found it on anvilfire.com!

Anvils in America - THE anvil book.

Blacksmithing and metalworking questions answered.



International Ceramics Products

Punching Round Holes in Steel

Tons to Punch Round Holes in Mild Steel Cold
Diameter
Inches
Thickness - Inches
.015 .020 .032 .063 .074 .090 .125 .188 .250 .313 .375 .438 .500
.188 .27 .35 .57 1.1 1.3 1.6 2.2 3.3 N/A
.250 .35 .50 .75 1.5 1.7 2.1 2.9 4.4 5.9 N/A
.313 .44 .59 .94 1.9 2.2 2.7 3.7 5.6 7.4 9.2 N/A
.375 .53 .70 .81 2.2 2.6 3.2 4.4 6.6 8.8 11 13 N/A
.438 .62 .83 1.3 2.6 3.1 3.7 5.2 7.8 10 13 15 18 N/A
.500 .71 .94 1.5 3.0 3.5 4.2 5.9 8.9 12 15 18 21 24
.625 .90 1.2 1.9 3.7 4.4 5.3 7.4 11 15 18 21 26 29
.750 1 1.4 1.6 4.4 5.2 6.4 8.8 13 18 22 27 31 35
1.00 1.4 1.9 3 6 7 9 12 18 24 30 35 42 47
1.25 1.8 2.4 3.8 7.4 8.8 11 15 22 29 37 44 50 59
1.5 2 2.8 3.2 8.8 10 13 18 26 36 44 53 62 71
1.75 2.5 3.3 5.2 10 12 15 21 31 41 52 62 72 82
2 2.8 3.8 6 12 14 18 24 36 48 59 71 83 95
2.50 3.6 4.8 7.6 15 18 22 30 44 58 74 88 103 118
3.00 4.2 5.7 9 18 21 27 36 54 72 89 106 124 141
3.50 5 6.6 10 21 24 30 42 62 82 103 124 145 164
4 5.6 7.6 12 24 28 36 48 72 96 118 141 165 189

To calculate the force to punch holes in metal you determine the cross section in shear and multiply it by the shear strength of the metal. The formula is Perimeter times thickness times shear. For round holes in steel this is Diameter * PI * 30. Thirty tons being the approximate shear strength of mild steel plus an allowance for friction. Tons are used to aid in press selection and rating. The practical limit for depth of punching cold is the diameter of the hole.

This table and the calculator below use the conservative value of 30 tons rather than the actual force of 25 tons per inch to shear mild steel.


punch_force.js

Units = Inches : Material = Steel
Hole Diameter In.
Material Thickness
Shear Area
Force Tons

  
anvilfire graphic (c) 1998 Patrick Dempsey
Home

Copyright ©2004
Jock Dempsey, DEMPSEY'S FORGE


References and Links

Counter Copyright © 2016 anvilfire.com