Various Definitions Related to the Mechanical Engineering Part 4


Gear Train:
Meshing of two or more gear. It can transmit power from one shaft to another shaft.

Heat Treatment:
Operation involving heating and cooling of a metal in solid state for obtaining desirable condition without being changed chemical composition.Its object-increase hardness of metal.increase quality of metal ( heat, corrosion,wear resistance quality )improve machine ability.

Ferrous Metal:
1. Cast Iron – (2-6.67)%C, Si, Mn, P, S

2. Steel – (0-2)%C

3. Wrought Iron – 99.5% Fe

Non-Ferrous Metal:
1. Brass – (Cu+Zn)

2. Bronze –

(Sn+Cu) —— Tin Bronze

(Si+Cu) ——- Silicon Bronze

(Al+Cu) ——- Aluminium Bronze

It is the difference between basic dimension of mating parts. That means, minimum clearance between mating parts that can be allowed.

It is the difference between upper limit of dimension. It is also the permissible variation above and below the basic size. That means maximum permissible variation in dimensions.

It is the ability to resist deformation.

It is the property to resist fracture.

When a material is subjected to repeated stress below yield point stress, such type of failure is fatigue failure.

Nuclear Fission:
It is a nuclear reaction by which one big nucleous divided into two or more nucleous.

Nuclear Fussion:
It is also a nuclear reaction by which one big nucleous will produced by adding two small nucleous.

It is the process of joining two similar or dissimilar metal by fusion.

Arc Welding –

* need D.C current

* produced (6000-7000) Degree Centigrade Temperature

Gas Welding –

* Oxy – acetylene flame join metals

* Oxygen & acetylene gas works

* produced 3200 Degree Centigrade Temperature

Machine Tool:
It is the power driven tool. It cut & form all kinds of metal parts.

Example – 1. Lathe 2. Drill Press 3. Shaper 4. Planer 5. Grinding 6. Milling 7. Broaching 8. Boring

Cutting Tool:

Tool Materials for Cutting Tool:
1. High Carbon Steel

2. High Speed Steel (W+Cr+V)

3. Carbide (W Carbide+Ti Carbide+Co Carbide)


It is the method of dividing periphery of job into equal number of division. Actually, it is the process of dividing circular or other shape of work-piece into equal space, division or angle.

It is one type of device which hold & locate work-piece and also guide & control cutting tool. It uses in drilling, reaming and tapping.

It is one type of device which hold and locate work-piece. It uses in milling, grinding, planning & turning.

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