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     Tons of Pressure Required to cut 1" Length of  Mild Steel
Mittler Brothers Machine & Tool
Metal Gauge Mild Steel Stainless Steel Brass
20 1.01 1.50 .75
18 1.25 1.75 1.00
16 1.75 2.50 1.25
13 2.50 3.50 2.00
11 3.25 4.75 2.25
3/16" 4.25 7.00 3.25
1/4" 6.25 9.50 4.50
5/16" 8.00 12.00 5.50
3/8" 9.50 14.25 6.25
7/16" 11.00 16.50 7.75
1/2" 12.50 18.75 8.75
5/8" 15.75 23.50 11.00
3/4" 18.75 28.25 13.25
7/8" 22.00 33.00 15.50
1" 25.00 37.50 17.50
     Blade Clearances For Mild Steel
Mittler Brothers Machine & Tool
Gauge or Thickness Decimal Thickness Overall Clearance
To Add  To Punch Size
30 .0120 Slip Fit
28 .0149 Slip Fit
26 .0179 .002
24 .0239 .003
22 .0299 .003
20 .0359 .004
18 .0478 .005
16 .0598 .006
14 .0747 .007
13 .0897 .009
12 .1046 .010
11 .1196 .012
1/8 .125 .012
10 .1345 .013
9 .156 .015
8 .164 .017
7 .1793 .021
3/16 .1875 .023
1/4 .250 .037
5/16 .3125 .047
3/8 .375 .057
1/2 .500 .075
5/8 .625 .125
3/4 .750 .150

Too much clearance will result in:

  • Extra roll-in at top of the cut.

  • Too much burr at the bottom of the cut.

Too little clearance will result in:

  • More shearing pressure is needed. Can reduce tool life.

  • High clamping force causes part distortion and extra blade wear.

Correct clearance will result in:

  • Straighter cut across material.

  • Minimum distortion at top of cut.

  • Minimum burr at bottom of cut.

The thicker the material the more noticeable are the effects of blade clearance: say 1/4" compared to 1/16".
 

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Ph. 636.745.7757

Fax 636.745.2874
 
 

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Last modified: 12/28/08