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Close-up of upper blade, lower blade, backgauge and work-holding device of a Gasparini guillotine shear. The design of press tools is an engineering compromise. A sharp edge, strength, and durability are ideal, but a sharp edge is not very strong or durable, so blades for metal work tend to be square-edged rather than knife-edged.
Other common blade patterns include the circle pattern or curved pattern and the hawk's-bill pattern. Circle pattern snips have a curved blade and are used to cut circles. Hawk's-bill snips are used to cut small radii on the inside and outside of a circle. The shape of the blades allow for sharp turns without buckling the sheet metal.
Strictly speaking, if the cutting blades are straight the process is called shearing; if the cutting blades are curved then they are shearing-type operations. [2] The most commonly sheared materials are in the form of sheet metal or plates. However, rods can also be sheared.
A piercing saw, also known as a jeweler's saw or jeweler's blade, is a type of saw commonly used in jewelry making on sheet metal. It is usually used on softer metals as the saw is delicate. [1] [2] Like a coping saw, a piercing saw holds the blade in tension in a metal frame. As the fine blades frequently break, the frame is adjustable for ...
The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.
There are four common types of cold chisels. These are the flat chisel, the most widely known type, which is used to cut bars and rods to reduce surfaces and to cut sheet metal that is too thick or difficult to cut with tin snips. The cross cut chisel is used for cutting grooves and slots. The blade narrows behind the cutting edge to provide ...
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