Manufacturing And Production Technology MCQ Questions & Answers | Mechanical Engineering

The width of the cutting edge of a parting-off tool depends on the type of material being cut and the rigidity required for the operation.

A typical range for parting-off tools used in lathe operations falls between 5 mm to 20 mm, which provides a balance between strength and precision.

Narrower tools (closer to 5 mm) are used for smaller workpieces and precision cuts, while wider tools (up to 20 mm) are preferred for heavier and tougher materials to reduce deflection and ensure stability.

Twist drill is a rotating cutting tool, used for cutting holes in rigid materials which is consists of an essentially conical point, relieved and fluted to form cutting lips, and spiral flutes which direct the chips away from the lips and toward ejection from the hole.

The tool material should be such that indentation by the abrasive grits does not lead to brittle failure. Thus the tools are made of tough, strong and ductile materials like steel, stainless steel and other ductile metallic alloys

In hot machining, tool is made of Tungsten carbide

EDM involves the direction of high-frequency electrical spark discharges from a graphite or soft metal tool, which serves as an electrode, to disintegrate electrically conductive materials such as hardened steel or carbide.

In a gating system, the ratio 1 : 2 : 4 represents, sprue base area : runner area : ingate area.

The vector sum of cutting velocity and chip velocity is equal to shear velocity.

the surface roughness is directly influenced by the spindle speed and feed rate. It is observed that the surface roughness increases with increased feed rate and is higher at lower speeds and vice versa for all feed rates.

At the same feed rate, increasing the side cutting edge angle increases the chip contact length and decreases chip thickness. As a result, the cutting force is dispersed on a longer cutting edge and tool life is prolonged.