Working with sheet metal
Crimping means that a narrow sheet edge is folded back by a full 180°. Here you achieve an elegant and effective edge protection as well as stabilization of the sheet to safeguard against sagging.
The procedure is the same as that described above under 'Straight bends'. However for a crimp you need a sheet projection of 10–15 mm.
Due to the relatively high bend resistance of this very short sheet side, it must first be carefully bent to 90° with a hammer.
Then anchor the sheet flat on the workbench and knock the short sheet side completely around with a hammer in many careful taps. The small sheet deformations do not detract from its appearance, as they are on the underside of the sheet.