Mom and Dad to visit me.

Tomorrow is saturday. Mom and Dad are coming to see me on a 1 day visit. Also the ME lab presentation tomorrow so gota complete its Report by night.

The day was average with 40% performance in Thermo quiz and 70% percent in maths quiz. But Im satisfied. Jo bhi pyar se mila ham usi ke ho liye.

Here is the ME Project Report:

TA 201 ME Project Report

MECHANICAL MULTIPLIER

Section :M3 Group:2

Group members:

Santosh Kumar (Y5408)

Satyartha Dixit (Y5411)

Saurabh Chawdhary (Y5415)

Saurabh Upadhyay (Y5418)

Shashank Shekhar Pandey (Y5428)

Acknowledgement

A project can’t be considered as finished until we say thanks to everyone who has contributed to our project. We would like to thank our instructor Dr. N. Venkata Reddy for giving us the opportunity of a project. We also express our gratitude to our tutor Mr. K.K.Kar who helped us at every stage of the project with his valuable suggestions and support.I would also like to thank Mr.Nafe Singh for his help.

Last but not the least, we are very much thankful to all the staff and guides who not only helped us in the project but also trained us in various skills and supported us in various types of experiments. Without them, it would be impossible to complete the project.

Objective

To make a mechanical multiplier to multiply two numbers showing the working of a new type of gear box.

Motivation

Before the advent of electronic computers, the complicated calculations were carried out through means of mechanical computers, the main components of which were- the adder and the multiplier. The component that we built serves as a prototype for “The multiplier”. The same principle is extended to countless mechanical devices which serve as force multiplier or displacement multiplier. The motivation to build the machine came from understanding this vital feature of worldwide used machines.

Working Principle

The working principle of the project is based on the working of a typical ‘Gear Box’. Gearbox is defined as a metal casing in which a train of gears is sealed. Gearbox is also called gear head, gear reducers or speed reducers. Their job is to convert the input provided by a prime mover into an output of lower RPM and correspondingly, higher torque. Therefore they use the ratio of gear teeth to vary the output rpm.

Device Description

This device uses the principle working of a gear box and does multiplication. In this device a 60 teeth gear acts as the driving gear where we decide the 1^st input value which is displayed on a wheel attached on the same shaft. The other shaft has three gears attached on it, they have teeth number 30,20 and 15. These gears decide the number of times we want to multiply the 1^st input value. As the input wheel is turned the number of divisions equal to the value of 1^st input the driving gear drives the driven gear the number of degrees depending on the gear ratio. The display of output is done through using a partial gear attached on the same shaft on which the gear system is attached, this partial gear helps in displaying the tens place. What it does is it rotates the wheel on the other shaft through one division when the 1^st shaft is rotated by 10 divisions thus on every one complete rotation the wheel on the tens rotates by one division, this is how the output is displayed.

DESCRIPTION OF THE COMPONENTS

Sr. No.	Name of Component	Dimensions of Component	Material of Component	Manufacturing Process Used	Number of Pieces
1	Spur Gear	Dia. = 93mm	Mild Steel	Turning and Milling	1
2	Spur Gear	Dia. = 48mm	Mild Steel	Turning and Milling	2
3	Partial Spur Gear(3 Teeth)	Dia. = 48mm	Mild Steel	Turning and Milling	1
4	Spur Gear	Dia. = 33mm	Mild Steel	Turning and Milling	1
5	Spur Gear	Dia. = 25.5mm	Mild Steel	Turning and Milling	1
6	Wheel	Dia. = 48mm	Mild Steel	Turning	2
7	Wheel	Dia. = 90mm	Mild Steel	Turning	1
8	Shaft Rods	Dia.= 16mm	Mild Steel	Cutting	3
9	Sheet	408x190x8mm	Mild Steel	Cutting	1
10	Sheet	150x120x3mm	Mild Steel	Cutting	2
11	Spring	Length = 150mm	Spring Wire	----	1
12	Angle	40x40x6mm	Mild Steel	Drilling	3
13	Flat	80x50x6mm	Mild Steel	Drilling and Cutting	3
14	Pipe	Dia.= 20mm	Cast Iron	----	1
15	Nut and Bolt	¼”	Iron	----	18
16	Rod	Dia.= 8mm	Mild Steel	Bending	3

Difficulties Faced

1. The gear ratio used to convert 10 units in the ones place to tens place was difficult to achieve as the gears turned more than the desired angle.
2. We needed gear ratio varying from 0.5 to 5 which was not possible because no. of teeth in a gear which can be made in lab is limited.
3. As the spring wire available in the lab was very stiff, the spring constant of the spring we made was very high, so we had to use long spring.

“K is proportional to 1/L”

Possible Modifications

1. The device can be scaled down to much smaller size.
2. The no. of digits of input can be increased, keeping the no of gears constant.
3. The no. of digits of multiplication can be further increased by increasing the no of gears.
4. By using a more sophisticated method, the way of changing the gears can be aptly modified.