Sheet Metal Corner Relief Size

In general a minimum bend relief is equal to the material thickness plus the inside bend radius. When sheet metal makes a transition from a bend to a flat surface or to another bend it tends to rip and tear. When considering sheet metal thickness a single sheet with punches holes is a good rule of thumb.

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For a 3 width ratio when the part is 1 mm in thickness the width of the slot will be 3 mm.

Sheet metal corner relief size.

To eliminate this a bend relief is added so the edge of the sheet metal is perpendicular to the bend. Assume the thickness is 1 mm a ratio to thickness equals to 4 will create a 4 mm per side square relief fig 5 for the obround relief the ratio to thickness options works in a similar manner. If you use the close 2 bend corner tool you can take the two corner types shown above and they will look like the closed corner shown below with the flat pattern to the right. Generally capabilities of of 0 9mm 20mm in thickness are able to be manufactured from sheet 3mm or plate 3mm but this tolerance depends mainly on the part.

The way this one works is that you select the tool first found on the home tab sheet metal group. This option is straight forward.

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