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2. Countersink - Wikipedia

   en.wikipedia.org/wiki/Countersink

   In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt , screw or rivet , when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat ...

3. Blanking and piercing - Wikipedia

   en.wikipedia.org/wiki/Blanking_and_piercing

   This allows for complex shapes to be formed in sheet metal up to 6 mm (0.25 in) thick using simple tools. [4] that is essentially a small punch and die that reciprocates quickly; around 300–900 times per minute. Punches are available in various shape and sizes; oblong and rectangular punches are common because they minimize waste and allow ...

4. Shear (sheet metal) - Wikipedia

   en.wikipedia.org/wiki/Shear_(sheet_metal)

   Large versions can cut sheet metal up to 12 gauge. [5] An alternative to the hand tools are hydraulically powered tools attached to heavy machinery. They are usually used to cut materials that are too bulky to be transported to a cutting facility, too big or dangerous for the hand tools and are stored at remote locations (e.g. mines, forests). [6]

5. Snips - Wikipedia

   en.wikipedia.org/wiki/Snips

   Snips, also known as shears, are hand tools used to cut sheet metal and other tough webs. It is a cutting tool. Workers use various types of snips, with the cutting edges being straight or curved to various degrees. The style of edge employed will depend if a straight sheer or some type of shapes cut is necessary.

6. Perforated metal - Wikipedia

   en.wikipedia.org/wiki/Perforated_metal

   The process of perforating metal sheets has been practiced for over 150 years. In the late 19th century, metal screens were used as an efficient means of separating coal. The first perforators were laborers who would manually punch individual holes into the metal sheet. This proved to be an inefficient and inconsistent method which led to the ...

7. Cleco (fastener) - Wikipedia

   en.wikipedia.org/wiki/Cleco_(fastener)

   Cleco (Cleko) fasteners on an aircraft wing. A cleco, also spelled generically cleko, is a temporary fastener developed by the Cleveland Pneumatic Tool Company. [1] Widely used in the manufacture and repair of aluminum-skinned aircraft, it is used to temporarily fasten sheets of material together, or to hold parts such as stiffeners, frames etc together, before they are permanently joined.