যন্ত্রকৌশল সঙ্গীত

        ----  যন্ত্রকৌশল সঙ্গীত-----
         সাইফুল ইসলাম মজুমদার
         এম ই ১/২ (B),  ডুয়েট

"মোরা উদ্যম, মোরা দুর্দম
মোরা ধাবমান, মোরা অাবহমান।
মোরা যন্ত্রকে করি গতিদান।।"-১

নীল অাকাশের ওই কালো মেঘ কেটে,
উড়ে যায় অগ্রগামী উড়োযান।
মানুষের তরে এই সভ্যতা অাজো অাবহমান...
"যুগের তরী মোরা বয়ে চলি,
কেটে জল কল কল,
বিশ্বের তরে অামাদের যন্ত্র প্রকৌশল।।"-২
................১...........

টারবাইনের পাখায় মোরা শক্তির জয়গান,
বয়লারের বাষ্পে অাজ, 
সমাজের রেলগাড়ি চলমান।
ডিজেল ইঞ্জিনের জলন্ত শিখা মোরা,
মোরা দিপ্তিমান।
..................১..............

কৃষকের তরে মোরা বিধাতার দান,
কারখানার চাকা প্রতিনিয়ত ঘুর্নায়মান।
অামরা যত নব প্রযুক্তির ঘামে ভেজা অভিধান,
চল সবাই মিলে গাই নব সৃষ্টির জয়গান।।
................১................
....................২..............

What is Heat?

Heat is energy transferred between a system and its surroundings as a result of
a temperature difference. Energy that passes from a warmer body (with a higher
temperature) to a colder body (with a lower temperature) is transferred as heat.
At the molecular level, molecules of the warmer body, through collisions, lose
kinetic energy to those of the colder body. Thermal energy is transferred—“heat
flows”—until the average molecular kinetic energies of the two bodies become
the same, until the temperatures become equal. Heat, like work, describes
energy in transit between a system and its surroundings.

Not only can heat transfer cause a change in temperature but, in some
instances, it can also change a state of matter. For example, when a solid is heated,
the molecules, atoms, or ions of the solid move with greater vigor and eventually
break free from their neighbors by overcoming the attractive forces between
them. Energy is required to overcome these attractive forces. During the process
of melting, the temperature remains constant as a thermal energy transfer (heat)
is used to overcome the forces holding the solid together. Aprocess occurring at a
constant temperature is said to be isothermal. Once a solid has melted completely,
any further heat flow will raise the temperature of the resulting liquid.
Although we commonly use expressions like “heat is lost,” “heat is gained,”
“heat flows,” and “the system loses heat to the surroundings,” you should not
take these statements to mean that a system contains heat. It does not. The
energy content of a system, as we shall see in Section 7-5, is a quantity called
the internal energy. Heat is simply a form in which a quantity of energy may be
transferred across a boundary between a system and its surroundings.
It is reasonable to expect that the quantity of heat, q, required to change the
temperature of a substance depends on
• how much the temperature is to be changed
• the quantity of substance
• the nature of the substance (type of atoms or molecules)

Collected by, shaiful islam majumder
Mechanical engineering, 1/2
Dhaka university of Engineering and Technology-DUET

Wiley: Accounting Principles, 11th Edition - Jerry J. Weygandt, Paul D. Kimmel, Donald E. Kieso

Wiley: Accounting Principles, 11th Edition - Jerry J. Weygandt, Paul D. Kimmel, Donald E. Kieso

Equation Of Life

Life is a Complex Equation, where D is A Unknown
variable! (D= Dream)
And x is a Targeted variable. (x=Number of season like,
1=Child, 2= pre Adult 3=young & 4= old)
L=Life
here, Dream is constant
So, Equation of life Life,

L =Limit  (Birth→die), x→1/2/3/4
∑ f( 10+x^3)+ D

Diagram of Iron-Carbon equilibrium

This is an real hand scratch of engg.shaiful islam majumder . 

The real iron -carbon equilibrium showd on picture with Eutectic and Eutectoid point include Temperature (selcious).

Law of Archimedes

Any object in the pool of liquid float arkimedisera sources discovered crack
 1. Floating object.
 II. Submerged object.

1: floating object floating sutrah object if a liquid condition
 "The Sinking of the entire object, the object of the total mass = volume of same external fluid mass".
If the floating mass of the displaced fluid mass of the object is greater than or equal to the Met. It is kept in the mass of the object with a solid volume concentration  portion refers to the portion of the volume of the fluid volume of the object, the greater the volume along the fluid density Product outer volume. When the weight / mass of the object, then you'll find there is a blank portion will be calculated by deducting the portion of the fluid to calculate the mass of an object submerged in volume estimation Exterior'll just, you do not need to remove the object is empty Co ..

 II. In case of sinking "dipped in liquid, resulting in loss of weight or volume of the fluid mass is equal to the total area ploating = object".
We usually find that anything can carry the water dobale takes light than before. Yet! Mass of the object is reduced to nothing. Light is then why ????
Because of this Light to an object in a fluid is the mass of the water to be floated on the liquid basabatura urdbamukhi a force. This ball plabata the fluid. Of water on an object is equal to the weight loss plabata the object means to lose weight because plabatai object. This is the total volume plabatara manata samaayatanera fluid density solutions with fluid. When the object is submerged kicuta space he occupied. This was a mass of occupied space and the amount of liquid. The mean value of the object on the object of the plabatara the bharatai losing weight!

how to make a end mill cutter(plane) by a vertical milling machine.

Name of the job: Making a boring cutter on vertical milling cutter

What is boring cutter: Boring cutter is a bar , we can make holes on any ferrous or non-ferrous  metal by it’s sharp edges. There have 2 or more cutting blades at last end of boring bar.Cutting blades are attached by screw bolt on catted shape on base metal bar.

Include instruments:

1.    Slide caliper

2.    Steel rule

3.    A solid cylindrical iron bar with essential diameter.

4.    Emery paper.

5.    Adjustable rang

A.  Steps of manufacturing:  To make a boring bar , steps of working given below-

A.  At first we have to choice a tool steel bar for desire Dia. Here have to remind that the cylindrical bar must be larger Dia then biggest Dia of boring bar body.

B.   Now fixed length of boring cutter with extra metal for facing . sheer these from full length bar.

C.  Sat this bar on lathe chalk for plane turning operation.

D.  Now sat the cutting tool in tool post and make plane turning operation on boring bar . which shown as (1) , in pic.

E.   Now take a tapper turning on fixed measure on boring bar . the catted part shown  as number (2).

F.   After finished second step of turning , sat tool post for tapper operation in noted angle( 15- 25 degree).

G.  Make tapper turning on bar at part of (3) , which also shown on drawing.

H.  At last make a plain turning on gripper end of boring bar. This part shown as (4) in drawing.

I.      Now attach this job on a vertical milling machine to make a complete gripper.

J.      And do this operation carefully so that gripper is get a shape in fixed size .

K.  After that, start to cut cutting blade slot , where cutting blades are attach by screw / some tool are not designed for attach blades , there cutting head attached by brass welding.

L.    After final finishing on cylindrical grinding machine , and emeri   paper , then send this job to inspection section of industry.

M.And when need to use this tool body , then attach cutting blades by welding or screw by specification of tool.

Written by Engr.Shaiful islam majumder

Research at Bangladesh Industrial Technical Assistance Centre(BITAC)

(A tool making industry)

 tejgown ,Dhaka, Bangladesh

E-mail : shaifulislammajumder@gmail.com