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

How to cut external thread on a cylindrical job

Name of the job: How to cut external thread on a cylindrical job

Included instruments:

1)   Lathe machine

2)   A job , where we have to make thread

3)   A slide calipers

4)   A outside caliper

5)   A wooden mallate 

Process of working: At first we have to know that how many threads contains in one inch.

And determine it correctly.

Now I am saying simply step by step about this operation.

A.     At first take a sylindrical metal piece where have to cut thread.

B.     Sat this job piece on lathe chulk in perfect alaignment 

C.    If there is have any sampol ,take those and take a measurment from this about how many single thread in each inch.

D.    Imagine this number is 5, so move your eye to the chart  which attached with quick change gear box.

E.      Find out number 5 in the chart. And at first see that what is writtend on root of its row. Really there have 8:1 and C . so sat the gear drives by 8:1 side and turn number liver on C.

F.     Now look at top of the collumn of 5 ritten box. There will have number 6. It is number of speed gear.

G.    So sat the speed gear on number six.

H.    Put a correct degree pointed cutting tool on tol post in proper alaignment.

I.        Turn on the lead screw lever.

J.       Start the machine and start to cut the thread.

K.    Continue visiting on operation and wait to arraibe cutting tool on last end of thread . then turn off the machine or give a back auto feed on lead screw.

L.     Continue cheak deepness so that deepness is not overcome fixed measure . if it is be too deep then right size, the job will be useless!

M.  So  when it will come at fixed size , then stop machine and stop operation.

N.    Visit this job piece and finally be sure that it is in accurate size.

O.    If not , then put in chalk and make operation again and make perfect thread .

Caution :  

Ø  Don’t make wrong when take the size of thread in inch.

Ø Always continue visiting when operation is on.

Ø Put the lever by  corretc instruction.

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