Bend Radius For Sheet Metal Rule Of Thumb

The sheet metal design rule of thumb in this case is.

Bend radius for sheet metal rule of thumb. If you re working with 304 stainless steel multiply its median percentage value 21 percent by the die opening. If the die opening is 0 551 in. Minimum sheet metal bending radius. Here s a good rule of thumb for most materials.

If the material is 0 5 in. Tabs must be at least 0 04 inches 1 mm from one another or the material s thickness whichever is. 0 551 0 16 the inside bend radius changes to 0 088. In order to develop the flat pattern we add 457 to 1 625 and 2 625 to arrive at 4 707.

So in this case the minimum inside bend radius is 2 times the material thickness. 4 0 5 2. In other words if you re bending 1 8 sheet use a tool with a 1 8 radius to form the inside of the bend. 2 5 material thickness bend radius.

When we calculate the bend allowance we find that it equals 457. 5 1 4. Now multiply that answer by the plate thickness. A cutout or the edge of your flange to your bend.

Note that this is just a rule of thumb. Usually the preferred distance between holes and a bend is 1 5 times the sheet thickness plus the bend radius 1 5 t h. Minimum sheet metal bend radius depends on the selection of tool and the process. For bends notches must be at least 3 times the material s thickness plus the bend radius.

In our example below a part with flange lengths of 2 and 3 with an inside radius of 250 at 90 will have leg lengths of 1 625 and 2 625 respectively. The inside bend radius should be equal to the thickness of the material that you re forming. Next subtract 1 from that answer. Supplying 3d models without considering these factors increases the.

The distance between the sheet metal bend line and edge of the hole should be two times or greater the thickness of the sheet metal. If you re bending 0 020 thick material use a 0 020 radius. Distance from outside mold line to the bottom of the cutout should be equal to the minimum flange length prescribed by the air bend force chart. Choose a bend radius that matches your minimum bend.

Determine your minimum bend by measuring the distance from your closest feature i e. If the die opening is 0 972 in. 0 972 0 16 the inside bend radius changes to 0 155. So if the metal plate is 75 thick you would multiply 4 x 75 3 so your minimum inside bend radius would be roughly 3 times the thickness of the material in this case or 2 25.