An introduction to Sheet Metal Work

摘要

For our purposes, this will usually mean making holes, typically round, in sheet metal. You can of course use a drill or a hole saw. The dual purpose gadget shown in photo 1 can be used to punch holes of about 5mm diameter to allow plug welding. It should be noted that for some parts, punching may be better done after forming especially where a flange is being shrunk, as the holes which are already on the small side for plug welding can close up further. In many cases, though it is easier to handle the work while it is still flat. Punching after forming can ensure that the holes remain at their intended size. The other side of the tool shown produces a joggle, useful where two sheets are overlapped.