The tab-route or breakaway tab method is suitable for PCBs with either similar or different designs, or where it is not possible or practical to use the V-grooves. The designer leaves a perforated tabs routing space between the different or similar boards, hence allowing for separation after processing.
Automatic machines translate to added costs and some such as the depaneling router creates vibrations, noise, and vast amounts of dust. In addition, you need to hold the board firmly. Although laser cutting is precise and has less mechanical stress, it is capital intensive and only applicable to board thicknesses of around 1 mm.
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