Bend Deductions Chart
Bend deductions (BD) is the amount of change in the material between the flat and the formed material, are developed from mathematical formulas. These calculations are, as they always have been, based on the measurable inside radius and the associated geometry of the bend.
The following information has been tested by Prototek Precision Machining and may vary from other manufacturers.
- Radius - Internal Radius
- Bend Deductions - Amount subtracted per bend (coined/set bends)
- Air Bend - Deduction for air bend.
- K-Factor - used for engineering programs, such as Pro-E and Solid Works
Colled Rolled Steel - CRS
|
| Thk |
Radius |
Bend Deduction |
Notes |
Air Bend |
K-Factor |
| .018 |
.030 |
.034 |
|
|
.5261 |
| .020 |
.030 |
.039 |
|
|
.4417 |
| .024 |
.030 |
.036 |
|
.047 |
.6599 |
| .030 |
.015 |
.047 |
|
|
.4125 |
| .030 |
.030 |
.047 |
|
.054 |
.5491 |
| .030 |
.060 |
.067 |
|
|
.3979 |
| .030 |
.187 |
.122 |
|
|
.3875 |
| .036 |
.030 |
.054 |
|
|
.546 |
| .036 |
.090 |
.085 |
|
|
.4532 |
| .040 |
.030 |
.065 |
|
|
.4437 |
| .040 |
.060 |
.075 |
|
|
.4035 |
| .048 |
.030 |
.072 |
|
.078 |
.4891 |
| .048 |
.060 |
.088 |
|
|
.4477 |
| .048 |
.090 |
.101 |
|
|
.4460 |
| .048 |
.202 |
.151 |
|
|
.4204 |
| .060 |
.030 |
.088 |
|
.103 |
.4762 |
| .060 |
.045 |
.095 |
|
|
.4702 |
| .060 |
.060 |
.106 |
|
|
.4218 |
| .060 |
.375 |
.232 |
|
|
|
| .060 |
1.000 |
.510 |
|
|
.4160 |
| .074 |
.030 |
.112 |
|
.125 |
.4318 |
| .090 |
.030 |
.131 |
|
.147 |
.4377 |
| .090 |
.125 |
.172 |
|
|
.4361 |
| .104 |
.030 |
.151 |
|
|
.4277 |
| .120 |
.030 |
.180 |
|
.205 |
.3866 |
| .134 |
.030 |
.201 |
|
|
.3795 |
| .175 |
.030 |
.270 |
|
|
|
| .178 |
.015 |
|
3/4 DIE |
.280 |
|
| .187 |
.030 |
.280 |
1.50 DIE |
.318 |
|
| .187 |
.030 |
- |
1.25 DIE |
.300 |
|
| .187 |
.060 |
.305 |
|
|
.3226 |
GALVANNEAL/GALVANIZED STEEL
| Thk |
Radius |
Bend D. |
Comments |
Air Bend |
K-Factor |
| .030 |
.030 |
.051 |
|
|
|
| .036 |
.030 |
.058 |
|
|
|
| .048 |
.030 |
.076 |
|
|
|
| .048 |
.060 |
.092 |
|
|
|
| .060 |
.030 |
.092 |
|
|
|
| .060 |
.060 |
.110 |
|
|
|
| .074 |
.030 |
.116 |
|
|
|
| .090 |
.030 |
.135 |
|
|
|
| .104 |
.030 |
.155 |
|
|
|
| .120 |
.030 |
.185 |
|
|
|
| .134 |
.030 |
.205 |
|
|
|
ALUMINUM
|
