The distance between hole and edge should be a minimum of two stock thicknesses. Should include a bend relief notch to avoid cracking or fracture. Constraints are particularly important in harder stock. The line of sharp V-bend should not be parallel with the grain direction, otherwise cracking or fracture is likely to occur.
Burrs are a result of the normal stamping process.
Burrs on the outside of a bend may create fractures. Burrs can be removed utilizing a number of different processes. Round is the easiest to draw, followed by square with adequate corner radii. Irregular shapes and those that combine two basic shapes into one are much more difficult and costly to produce. Normally, the punch and die radius should be a minimum of four times the material thickness.