Mechanical cutting uses power-driven machines like lathes, milling machines, and drill presses to shape and form materials according to a predetermined design. Some common tools for cutting sheet metal include hand shears, bench shears, shear machines, and nibblers. Bench shears can be used to cut straight lines, curves, and shapes in mild steel plates up to around 1.6 mm thick. Different tools are suited for cutting different materials and thicknesses.

1. Mechanical
Cutting
-Mohd.Kadappi Bin Mohd. Sapie
-Mohd. Norsafarizan Bin Haji Awang
-Noralina Binti Zanidi
-Nur Athirah@Nabila Binti Mohd. Hashim
-Abdul Muiz Bin Nordin

2. Principle of Mechanical
Cutting
= Mechanical cutting, which includes tooling and
machining, is a process that uses power-driven
equipment to shape and form material into a
predetermined design. Some common machines used in
mechanical cutting include lathes, milling machines, and
drill presses, which correspond to the processes of
turning, milling, and drilling, respectively.
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laser-cutting

3. Differences
Hand shears
- Use to cut small length of sheet metals
- Build similarly to scissors but with a stronger shearing blade
- cuts perpendicular to the axis of the tool handle.
- consist of a moving shear blade with a fixed rake angle and shear angle.
Bench shears
- Operate similar to paper cutter.
- Have a fixed blade and a movable blade.
- Blades are straight and only used for straight cutting.
- They are able to punch holes in metal sheets.
Shear machine
- Used to cut straight lines into sheet metal.
- The blades are directly perpendicular to the surface getting punched.
- Not only can cut sheet metal, but also other metal forms.
Nibbler
- Cuts sheet material by a series of small rapidly reciprocating cuts.
- Able to create a hole in the middle of a sheet without having to cut up to that hole.
- Can be use on any type of sheet metal up to a 1/2 inch thick, provided that the metal is a softer type.
- They only work with sheet metal.

4. Maximum thickness of mild steel plate
cut by bench shears
• Mild steel -Steel that contains small amount of carbon
-Softer and easily shaped
• Bench shear-Shears that sit on a bench or stand.
-Variety of sizes and capacity to1/4 inch capacity in 3 - 36
inch
-Used to cut straight, curves and shapes
• Maximum cutting thickness1.6 mmsheet or10 mm round wire stock of mild
steel