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The most common perforated sheet metal hole is the round shape. This is simply because the hole is the easiest punching tool to manufacture, reducing the cost for both the punch and the die. According to the Wilson standard tool booklet (www.wilsontool.com), the standard tool shapes can be seen on the illustration below:
(A) Rectangle, (B) Round/Circle, (C) Rectangle, (D) Equilateral Triangle, (E) Obround / Oblong, (F) Long “D”, (G) Octagon, (H) Hexagon, (I) Single “D”, (J) Double “D”, (K) Quad “D”.
There are also countless shapes that can be customized for perforating holes, such as 4-ways radius tool, diamond shape, cross, star, clover leaf, elliptical, etc. Each of these shapes, either in standard or custom form, will create a distinctive design for the perforation project and this will be even more distinctive if a particular shape is combined together with other shapes to produce a unique pattern.
Besides being merely holes, for particular purposes, the hole can also be formed. One of the forming shapes for a hole is a dimple. The dimple shape is usually used for steps or walkways to prevent slipping. They have also been used to create dimple jackets for winery tanks in processing industries. The function of this dimple jacket is to heat and cool the content of a storage tank. The other forming shape is the louvre to provide ventilation and air flow in buildings or inside machine enclosures.
A Simple dimple sheet metal for walkways and steps. The edge of the hole is sharp to reduce slipping.