Bend allowance is a measure of how much extra material is required to accommodate a bend in sheet metal.This is a function of the bend angle, bend radius, thickness of the material, and a variable called the K-factor.Bend allowances vary based on the angle of the bend, the type and thickness of the material, and the method used to create the bend. Calculate unfold size with bend allowance chart. Bend forming 0°L=A+B-0.43T, T=Thickness, Deduction=0.43T. Formula: L(unfold length)=A(Outside size)+B(Outside size)-K(K-factor) None-90° bend unfold according to the neutral layer, the distance from neutral to sheet inner side is T/3, inner R can refer to above chart. Calculate unfold size with bend allowance chart. Bend forming 0°L=A+B-0.43T, T=Thickness, Deduction=0.43T. The deduction is 1.8 times the steel plate thickness and 1.6 times the aluminum plate. For plate under 2mm, K-factor is 0.432, R=plate thickness, unfold size can accurate to 0.05. Ending Sheet Metal We are often surprised by the number of aircraft builders who seem to be intimidated by the process of calculating bend allowance, setback, and simply creating a flat layout for bending a simple part. In this article we are going to back up a bit, and provide. Figure: 1 Bending Aluminum Figure: 2 Sample Bend Radius Chart. Understanding the Bend Allowance and consequently the Bend Deduction of a part is a crucial first step to understanding how sheet metal parts are fabricated. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. As this happens you gain a small amount of total length in your part.
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Tolerances: Sheet metal tolerances should not be tighter than necessary to make the part functional. Tight tolerances raise the cost of manufacturing significantly. Practical tolerances vary according to the design requirements. Tolerances of +/- .010 should be considered minimum. Linear tolerances should be held as loose as possible. Recommend +/- .020 for general, and tolerance functional areas as needed.
![Aluminum Bend Allowance Chart Pdf Aluminum Bend Allowance Chart Pdf](/uploads/1/2/5/8/125886684/426856605.png)
Flatness: Flatness specifications are applied with perfect form not required at maximum material condition. If there is a rule of thumb, a flatness tolerance of .005' per inch is the best that can be achieved without secondary individual checking and straightening. In general the primary datum should have some type of form specified. Defining the primary datum by datum targets in a retrained condition is preferred.
Minimum Bend Radii: The minimum bend radii data contained within the given charts are measured to the inside of the bend. The bend radii listed are standard minimum for manufacturing for aerospace and space applications. Commercial sheet metal radius are created with less concern for stresses created during forming and radii can approach zero (sharp internal corner) for many thin sheet metal gages. Grain Direction A 'grain' is formed in metal in the direction in which the sheet is rolled at the mill. Be careful not to confuse this with surface finishes produced by grinding of other finishing operations. Grain direction is usually specified on stainless steel and other hard materials when it is necessary to maintain minimum bend radius or to control spring back on parts with large radius forms. The grain can be seen by viewing off the shelf sheet and noting the direction of visible lines running end to end.
Aluminum Bend Allowance Chart Pdf 2016
General: Concurrent design processes almost always reduces iterations between design and manufacturing. Submit preliminary designs to manufacturing for recommendations and review. Manufacturing comments almost always results in less expensive, more manufacturability, better parts and ultimately designs. ALUMINUM (BARE & CLAD) Minimum Bend Radii
Note: Bend radius of zero is achievable for .012 - .050 material thickness. Commercial applications
Note: Bend radius of zero is achievable for .012 - .050 material thickness. Commercial applications
Aluminum Sheet Metal Size Table Chart
SHEET THICKNESS | ||||||||||||||
.012 | .016 | .025 | .040 | .063 | .080 | .100 | .160 | |||||||
2024-0 & W | .06 | .06 | .06 | .09 | .12 | .19 | .31 | |||||||
2024-T3 | .06 | .09 | .12 | .22 | .31 | .44 | .75 | |||||||
2024-T36 | .09 | .09 | .16 | .25 | .38 | .50 | 1.00 | |||||||
3003-0 | .06 | .06 | .06 | .06 | .09 | .12 | .16 | |||||||
3003-H14 | .06 | .06 | .09 | .12 | .16 | .22 | .38 | |||||||
5052-0 | .06 | .06 | .06 | .09 | .09 | .12 | .19 | |||||||
6061-0 & W | .06 | .06 | .06 | .09 | .09 | .12 | .19 | |||||||
6061-T4 & T6 | .06 | .06 | .06 | .09 | .12 | .19 | .31 | |||||||
7075-0 & W | .06 | .06 | .09 | .16 | .22 | .31 | .50 | |||||||
7075-T6 | .09 | .12 | .22 | .31 | .44 | .69 | 1.00 | |||||||
7178-0 & W | .06 | .06 | .09 | .19 | .25 | .38 | .75 | |||||||
7178-T6 | .09 | .19 | .31 | .50 | .62 | .75 | 1.25 |
![Press Press](/uploads/1/2/5/8/125886684/204993847.jpg)
Stainless Steel Sheet Metal Guage Size Table Chart
SHEET THICKNESS | |||||||||||||||
.012 | .016 | .025 | .036 | .045 | .063 | .090 | .125 | .190 | |||||||
.06 | .06 | .06 | .09 | .09 | .12 | .16 | .22 | ||||||||
347-1A | .06 | .09 | .06 | .09 | .09 | .12 | .19 | .25 | |||||||
.06 | .06 | .06 | .09 | .12 | .16 | .22 | .31 | ||||||||
1/2 Hard Cres | .06 | .09 | .12 | .12 | .16 | .25 | .38 | .62 | |||||||
.06 | .09 | .12 | .16 | .22 | .31 | .44 | .62 |
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