Projectreportmakingcompleted-141126083349-conversion-gate01.pdf

A Minor Project Report on

Fabrication of Lawn Mower Submitted to RAJIV GANDHI PROUDYOGIKI VISHWAVIDHYALAYA BHOPAL (M.P.) In Partial fulfillment for the award of degree of

BACHELOR OF ENGINEERING IN MECHANICAL ENGINEERING By Ashwani Dixit, 0714CS111017 Karan Singh Rathore, 0714ME111053 Under the Guidance of Mr. Ankur Dave Assistant Professor

MAHAKAL INSTITUTE OF TECHNOLOGY & MANAGEMENT, UJJAIN 1

FABRICATION OF LAWN MOWER

Ashwani Dixit Karan Singh Rathore

MAHAKAL INSTITUTE OF TECHNOLOGY & MANAGEMENT, UJJAIN 2

ABSTRACT

The design objective is to come up with a mower that is portable, durable, easy to operate and maintain. It also aims to design a self- powered mower of electrical source; a cordless electric lawn mower. The heart of the machine is a battery-powered DC electric motor. It comprises of a system of speed multiplication pulleys which drive the cutting blades and the charging unit comprising of a 12V alternator and a lift mechanism meant to alter the height of cut. This is achieved by means of a system of pulleys with minimal slip effect; collapsible blades to reduce the common problem of wear. The use of collapsible blades and incorporation of an alternator for recharging the battery make the design unique such that no engine is involved. Performance test gave a cutting efficiency of 89.55% with 0.24kN human effort. Thus, the machine is considered highly efficient and is readily adaptable to different cutting conditions.

KEYWORDS

Lawn Mower Electric Motor Battery

3

Declaration

We hereby declare that the project entitled FABRICATION OF LAWN MOWER is the actual work carried out by us in the department of MECHANICAL ENGINEERING under the guidance of Mr. ANKUR DAVE, Asst. Professor.

Name

Enrollment Number

Ashwani Dixit

0714CS111017

Karan Singh Rathore

0714ME111053

4

Signature

CERTIFICATE

This is to certify that the project entitled FABRICATION OF LAWN MOWER has been carried out by Ashwani Dixit with 0714CS111017 & Karan Singh Rathore with 0714ME111053 under my guidance in partial fulfillment for the award of BACHELOR OF ENGINEERING in MECHANICAL by the Rajiv Gandhi Technical University, Bhopal (M.P.), during the academic year 201415.

Prof. Bharat Chede

Mr. Ankur Dave

Head

Project Guide

Department of Mechanical Engineering 5

Asst. Professor

ACKNOWLEDGEMENT

First and foremost, I would like to express my highest appreciation to my supportive academic professor, Mr. Ankur Dave. His supervision and support that gave me truly helps during the period of conducting my project. His neverending supply of valuable advice and guidance has enlightens me and deeply engraved in my mind. Next, I would like to dedicate my thankfulness to him, for his enthusiastic support and supervision of the thesis revision. I’m also happy to present my gratefully acknowledge to Machinery laboratory technicians, who has been so warmth and kind to provide sincere assistance and good cooperation during this period. Their co-operation is much indeed appreciated. In addition, I would like to convey thanks to lecturers, for their assistance, which really spends their time to teach me a lots of knowledge regarding to the design development. Last but not least, I would like to state my appreciation to the staff – Faculty of Mechanical Engineering, my friend and colleagues for supporting me and administration department for their help in the project .

Thank you!!!

6

Contents Chapter 1:- Introduction………………………………………………………………………………………. 1 Chapter 2:- Literature Review ……………………………………………………………………………4 - 12 2.1 History ……………………………………………………………………………………..…4 2.2 Further Improvements ………………………………………………………………..…...7 2.3

Types of Lawn Mower ……………………………………………………………..……11 2.3.1 Cylinder or Reel Mower …………………………………………………..…….11 2.3.2 Rotary Mowers …………………………………………………………….……..11 2.3.3 Gasoline (Petrol) …………………………………………………………..…….11 2.3.4 Electricity ………………………………………………………………………….12

Chapter 3:- Material and Methods …………………………………………………………………….13 - 21 3.1 Materials ……………………………………………………………………………………13 3.1.1 Blade ……………………………………………………………………………..…13 3.1.2 Body Frame ………………………………………………………………………..13 3.1.3 Wheel ……………………………………………………………………………….14 3.1.4 Push Handle …………………………………………………………………….…14 3.1.5 Motor ………………………………………………………………………………..15 3.1.6 Bag ………………………………………………………………………………….15 3.1.7 Battery ……………………………………………………………………………...15 3.2 Specifications ……………………………………………………………………………...16 3.3 Methodology Adopted for Assembling of Lawn Mower………………………….…17 3.4 Technical Specifications …………………………………………………………….…..18 3.5 Method of Use ……………………………………………………………………….…….18 3.5.1 Starting ………………………………………………………………………..…….18 3.5.2 Moving ……………………………………………………………………………....19 3.5.3 Area of cut (Battery Duration) ………………………….............…………..….19 3.5.4 Setting the cutter depth ……………………………………………………..…...19 3.5.5 Charging the battery ………………………………………………………...……19 3.5.6 Maintenance ………………………………………………………………………..20 3.5.7 Replacing the Cutting Blade …………………………………………………….20 3.5.8 Replacing Fuses …………………………………………………………………..20 3.5.9 Cleaning Blades ……………………………………………………………….…..21 3.5.10 Dispose of Batteries ……………………………………………………...………21 3.5.11 Dispose – Recycling …………………………………………………...…………21 Chapter 4 :- Results and Discussions……………………………………………………………………….22 References ……………………………………………………………………………………………………….23

7

Chapter 1 INTRODUCTION

A lawn mower is a machine that uses one or more revolving blades to cut a lawn to an even height. The blades may be powered either by hand pushing the mower forward to operate the mechanical blade(s), or may have an electric motor or an internal combustion engine to spin their blades. Some mowers also include other abilities, like mulching or collecting their clippings. An electrical Lawn Mower is more suitable & easy to use than the lawn mower with an engine, so we are making an electrical lawn mower with an electric motor, which is providing the high speed rotation to the blades. Cordless electric mowers are powered by a variable number (typically 1-2) of 12-volt rechargeable batteries. Typically, more batteries mean more run time and/or power. Batteries can be in the interior of the lawn mower or on the outside. If on the outside, the depleted batteries can be quickly swapped with recharged batteries. Cordless mowers have the maneuverability of a gasoline powered mower and the environmental friendliness of a corded electric mower.

(Fig. 1): A typical Modern Battery Powered Lawn Mower 8

The design of an electrical lawn mower contents a blades, bed knife, body frame, wheels, push handle, bag, & motor. The power system there are many Options, but we are using rechargeable battery powered motor, which is attached to the cutting blades. Sizing the battery will depend on what we are powering, specifically the motors. Like batteries, there is a range of motors to choose from. We went with 24 volt motor with integrated gear heads.

(Fig. 2) Electrical Circuite Diagrame of the Lawn Mower

Lawn mower are very common in an open area. Even when left unattended for a few days grass, weeds and wild shrubs cover the ground. A lot of grass cutter machines are available in market for cutting grass but these machines are not able to cut thick shrubs. Therefore these shrubs have to be cut manually or by using some special machines like brush cutters. In this work to revamp an existing setup. Various shortcomings of the machine were carefully examined and machine was customized to meet the requirements of a shrub cutter machine.[1] The electrical circuit of a lawn mower, which are shown in the fig. 2. In this Circuit diagram the battery connected to the motor by an alternator. Cutter deck housing — This houses the blade and the drive system of the mower. It is shaped to effectively eject the grass clippings from the mower.

9

Blade mounting and drive system — The blade of a rotary mower is usually mounted directly to the motor shaft. Mower blade — A rotary mower generally has two blades that rotates horizontally. The blade features edges that slightly curved up to generate a continuous air flow as the blade rotates, thus creating a sucking and tearing action. [1]

10

Chapter 2 LITERATURE REVIEW

A lawn mower, alternatively spelled lawn mower, is a device which by mean of one or more revolving blades is used to cut grass or other plants to an even length. Lawn mower employing a blade that’s rotate about a vertical axis are known as rotary mowers, while those employing a blade assembly that’ rotate about a horizontal axis are known as cylinder or reel mowers. Many difference design have been made each suited to a particular purpose. The smallest types, pushed by a human, are suitable for small residential lawns. And gardens, while larger, self- contained, ride on mowers are suited for large lawns, and the largest multi speed mowers pulled behind a tractor are design for large expanses of grass such as golf courses and municipal parks. [2]

2.1 History The first Lawn mower was invented by English engineer Edwin Beard Budding in 1827. Budding’s mower was designed primarily to cut the lawn on sports grounds & expensive gardens as a superior alternative to the scythe. His patent of 25 October 1830 described “a new combination and application of machinery for the purpose of cropping or shearing the vegetable surfaces of lawns, grass plates and pleasure ground. The patent went to state. “Country gentlemen may find in using my machines themselves an amusing, useful and healthy exercise”. It took ten more years and further innovations to create a machine 1that could be worked by donkey or horse power & 60 years before a steam powered lawn mower was build. In an agreement between John Ferrabee and Edwin Budding dated May 18, 1830, Ferrabee paid the cost of development, 11

obtained latters of patent and acquired right to manufacture, sell and licensed to other manufacturers in the production of lawn mowers. Manufacture of lawn mowers began in the 1850s. By 1862, Farage’s company was making eight models in various roller sizes up to 900 mm (36inches). He manufactured over 5000 machines until production ceased in 1863. Thomas green produced the first chain driven mower in 1859, named the Silence Mess ore. On May 9, 1899, an improved cylinder mower was patented in U.S. patent 624, 749, with the wheel placement altered for better performance. Mariah M. Hills went on to found the Archimedean Lawn Mowers Co. 1871. Around 1900, one of the best known English was the ransoms Automation, available in chain or driven models. About this time, an operator could ride behind animals that pulled the large machines. This were the first riding mowers. Invention.

(Fig. 3) An early cylinder (reel) mower, showing a fixed cutting blade in front of the rear roller and wheel-driven rotary blades. 12

The first lawn mower was invented by Edwin Budding in 1827 in Thrupp, just outside Stroud, in Gloucestershire. Budding's mower was designed primarily to cut the grass on sports grounds and extensive gardens, as a superior alternative to the scythe, and was granted a British patent on August 31, 1830.[2] Budding's first machine was 19 inches (480 mm) wide with a frame made of wrought iron. The mower was pushed from behind. Cast iron gear wheels transmitted power from the rear roller to the cutting cylinder, allowing the rear roller to drive the knives on the cutting cylinder; the ratio was 16:1. Another roller placed between the cutting cylinder and the main or land roller could be raised or lowered to alter the height of cut. (Fig. 3) The grass clippings were hurled forward into a tray-like box. It was soon realized, however, that an extra handle was needed in front to help pull the machine along. Overall, these machines were remarkably similar to modern mowers. [3] Two of the earliest Budding machines sold went to Regent's Park Zoological Gardens in London and the Oxford Colleges.[4] In an agreement between John Ferrabee and Edwin Budding dated May 18, 1830, Ferrate paid the costs of enlarging the small blades, obtained letters of patent and acquired rights to manufacture, sell and license other manufacturers in the production of lawn mowers. Without patent, Budding and Ferrabee were shrewd enough to allow other companies to build copies of their mower under license, the most successful of these being Ransomes of Ipswich, which began making mowers as early as 1832. [3] His machine was the catalyst for the preparation of modern-style sporting ovals, playing fields (pitches), grass courts, etc. This led to the codification of modern rules for many sports, including for football, lawn bowls, lawn tennis and others.

13

2.2 Further improvements It took ten more years and further innovations to create a machine that could be drawn by animals, and sixty years before a steam-powered lawn mower was built. In the 1850s, Thomas Green & Son of Leeds introduced a mower called the Silens Messor (meaning silent cutter), which used a chain to transmit power from the rear roller to the cutting cylinder. These machines were lighter and quieter than the gear driven machines that preceded them, although they were slightly more expensive. [3] The rise in popularity of lawn sports helped prompt the spread of the invention. Lawn mowers became a more efficient alternative to the scythe and domesticated grazing animals. Manufacture of lawn mowers took off in the 1860s. By 1862, Ferrabee's company was making eight models in various roller sizes. He manufactured over 5000 machines until production ceased in 1863. The first grass boxes were flat trays but took their present shape in the 1860s. James Sumner of Lancashire patented the first steam-powered lawn mower in 1893. His machine burned petrol and/or paraffin (kerosene) as fuel. These were heavy machines that took several hours to warm up to operating pressure. After numerous advances, these machines were sold by the Stott Fertilizer and Insecticide Company of Manchester and Sumner. The company they both controlled was called the Leyland Steam Motor Company. Around 1900, one of the best known English machines was the Ransoms' Automaton,

available

in

chain-

or

gear-driven

models.

Numerous

manufacturers entered the field with petrol (gasoline)-driven mowers after the start of the 20th century. The first was produced by Ransomes in 1902. JP Engineering of Leicester, founded after World War I, produced a range of very popular chain driven mowers. About this time, an operator could ride behind animals that pulled the large machines. These were the first riding mowers. The first United States patent for a reel lawn mower was granted to Amariah Hills on January 12, 1868.[5] In 1870, Elwood McGuire of Richmond, Indiana designed a human-pushed lawn mower, which was very lightweight and a commercial success. John Burr patented an improved rotary-blade lawn mower 14

in 1899, with the wheel placement altered for better performance. Amariah Hills went on to found the Archimedean Lawn Mower Co. in 1871.

(Fig. 4) Commercial lawn mower is used in April 1930 in Berlin.

For centuries, grass was cut by workers who walked through pastures or fields wielding small, sharp scythes. In addition to being tiring and slow, manual cutting was ineffective—the scythes worked well only when the grass was wet. The first mechanical grass-cutting device appeared in 1830, when an English textile worker named Edwin developed a mower allegedly based on a textile machine used to shear the nap off of cloth. Budding's cylindrical mower was attached to a rear roller that propelled it with a chain drive, and it shaved grass with a curved cutting edge attached to the cylinder. He created two sizes, large and small. The large mower had to be drawn by horses, whose hooves were temporarily shod with rubber boots to prevent them from damaging the turf; the head gardener at the London Zoo was among the first to purchase this model. Budding marketed the smaller mower to country gentlemen, who would, he claimed, "find in [his] machine an amusing, useful and healthful exercise."

15

Mechanized grass cutting was evidently slow to catch on, perhaps because Budding's mower was quite heavy in addition to being inefficiently geared. Only two lawn mower manufacturers exhibited their machines at England's Great Exhibition in 1851.(fig. 4) However, several decades later the new machines experienced a surge in popularity due to the interest in lawn tennis that arose in England during the late Victorian period. Before the turn of the century, Budding's initial designs were improved. Weighing considerably less than their predecessors and based on the side wheel design still used in today's most popular mowers, these refined machines were soon visible in yards throughout England. The earliest gas-driven lawn mowers were designed in 1897 by the Benz Company of Germany and the Coldwell Lawn Mower Company of New York. Two years later an English company developed its own model; however, none of these companies mass produced their designs. In 1902 the first commercially produced power mower, designed by James Edward Ransome, was manufactured and sold. Although Ransom’s mower featured a passenger seat, most early mowers did not, and even today the most popular models are pushed from behind. Power mowers are presently available in four basic designs: the rotary mower, the power reel mower, the riding mower, and the tractor. Because the rotary mower is by far the most common, it is the focus of this entry. Pushed from behind, rotary mowers feature a single rotating blade enclosed in a case and supported by wheels. As the engine turns, it spins the blade. The blade whirls at 3,000 revolutions per minute, virtually 19,000 feet (5,800 meters) per minute at the tip of the blade where the cutting actually occurs. The best rotaries feature a horn of plenty (cornucopia) or wind tunnel shape curving around the front of the housing and ending at the discharge chute through which the mown grass flies out. Self-propelled models are driven by a chain or belt connected to the engine's drive shaft.[5] A gearbox usually turns a horizontal axle which in turn rotates the wheels. Some models have a big chain- or belt-driven movable unit that rises up off and settles down on the wheels.

16

The power reel mower features several blades attached at both ends to drums that are attached to wheels. The coupled engine drive shaft that spins the reel can also be rigged to propel the mower, if desired. Overlapping the grass, this machine's five to seven blades pull it against a cutting bar at the bottom of the mower. Then one or more rollers smooth and compact the clippings as the mower goes over them. Reel mowers are more efficient than rotary mowers because the latter actually use only the end of the blade to do most of the cutting, whereas the fixed blades in a reel mower cut with the entire length of both edges. However, rotary mowers are easier to manufacture because the basic design is simpler, and they are also favored over reel mowers on most types of turf. By industry estimates, most of the 40 million mowers in use on any given summer Saturday are rotary mowers. Rotary mowers were not developed until engines were small enough and powerful enough to run the blades at a high speed. Many people experimented with rotary blades in the late 1920s and early 1930s, and Power Specialties Ltd. introduced a gasoline-powered rotary mower. The story of one experiment in the design of rotary mowing equipment is that of C C Stacy, a farmer in the Midwest region of the United States. His concept was the use of a toothed circular saw blade mounted horizontally on a vertical shaft, which would be suspended at a height of approximately 2 inches (50 mm) and moved across a lawn to cut grass and other lawn vegetation at a uniform height. The power for his experimental mower was an electric motor. The success of Stacy's design was limited by two factors: the relatively small diameter of the saw blades he used for his experiments, which were about 8 inches (200 mm); and the fact that toothed circular saw blades are not an ideal tool for cutting free-standing grass and other plants. Stacy did not come up with any idea for a cutter similar to modern rotary mower straight blades, and soon dropped his experiments with rotary mowing.

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2.3 Types of Lawn Mower

2.3.1 Cylinder or reel mowers:A cylinder mower or reel mower carries a fixed, horizontal cutting blade at the desired height of cut. Over this is a fast-spinning reel of blades which force the grass past the cutting bar. Each blade in the blade cylinder forms a helix around the reel axis, and the set of spinning blades describes a cylinder. [6] The basic push mower mechanism is also used in gangs towed behind a tractor. The individual mowers are arranged in a "v" behind the tractor with each mower's track slightly overlapping that of the mower in front of it. Gang mowers are used over large areas of turf such as sports fields or parks. [6]

2.3.2

Rotary mowers:-

A rotary mower rotates about a vertical axis with the blade spinning at high speed relying on impact to cut the grass. This tends to result in a rougher cut and bruises and shreds the grass leaf resulting in discoloration of the leaf ends as the shredded portion dies. This is particularly prevalent if the blades become clogged or blunt. Most rotary mowers need to be set a little higher than cylinder equivalents to avoid scalping and gouging of slightly uneven lawns, although some modern rotaries are fitted with a rear roller to provide a more formal striped cut. These machines will also tend to cut lower (13 mm) than a standard four-wheeled rotary.

2.3.3 Gasoline (petrol):Most rotary push mowers are powered by internal combustion engines. Such engines are usually four-stroke engines, used for their greater torque. (Although a

number

of

older

models

used

two-stroke

engines),

running

on gasoline (petrol) or other liquid fuels. Internal combustion engines used with lawn mowers normally have only one cylinder. Power generally ranges from two to seven horsepower (1.5 to 6.75 kW). The engines usually have 18

a carburetor and require a manual pull crank to start them, although a starters offered on some models. Some mowers have a throttle control on the handlebar with which the operator can adjust the engine speed.

(Fig.5) The first gasoline-powered lawn mower, 1902.

Other mowers have a fixed, pre-set engine speed. Gasoline mowers have the advantages over electric mowers of greater power and distance range. They do create pollution due to the combustion in the engine,(Fig. 5) and their engines require periodic maintenance such as cleaning or replacement of the spark plug and air filter, and changing the engine oil.[7][8]

2.3.4 Electricity:Electric mowers are further subdivided into corded and cordless electric models. Both are relatively quiet, typically producing less than 75 decibels, while a gasoline lawn mower can be as loud as 95 decibels or more. [9]

19

Chapter 3 MATERIALS AND METHODS

3.1 Materials The main parts of a cylinder or reel mower are:3.1.1 Blade - Consist of blades that are attached to a vertically rotating shaft, to the downward direction. The blades rotate, creating a cutting motion.(fig. 6)

(Fig. 6) A High-Carbon Steel Cutting Blade It’s important to cut lawn, with a sharp blade as blunt blades can rip or tear grass from the roots, damaging our greenery and causing our lawn to become patchy over time. Size: - 13 inches,

Metal: - The blade is made of Steel.

3.1.2 Body frame - The main structural frame of the mower onto which the other parts of the mower are mounted. 20

The

frame

is

that

provides

a

base

unit

that

all

of

the

components/subsystems are mounted on. The hollow Iron piped frame will be designed to provide adequate sectioning for the separate subsystems. The rear wheel motors are mounted to the rear exterior section of the frame. The Batteries will have a separate compartment for mounting and secured safely. The Frame is to be composed of 1.5”x2.5”. Hollow Iron pipe was chosen due to its strength and availability. 3.1.3 Wheels - These help propel the mower in action. Generally, our lawn mowers have four wheels. The diameter of the wheel is 8 inches.(Fig. 7)

(Fig. 7) A Base Frame with Four Wheels of the Lawn Mower The wheels having rubber gripped, for better moving on grass. We are using wooden wheels for reducing the cost of lawn mower. 3.1.4 Push handle - The "power source" of a manually operated mower. (Fig.8) .This is a sturdy U-shaped handle that is connected to the frame, wheels and blade chamber. The length of push handle is 36 inches.

(Fig 8) A push Handle of the Lawn Mower The hollow Iron piped push handle will be designed to provide adequate sectioning for the separate subsystems. 21

3.1.5 Motor - The power source of a lawn mower that is powered by electric. The electric motors for lawnmowers are typically 24V DC motor. (Fig. 9) The benefits of the electric motors are that they run very quietly and they do not take up too much space on the mower chassis.

(Fig. 9) Merathon Electric Motor 3.1.6 Bag – The bag is carried catted grass clippings. 3.1.7 Battery –For this project, a Lithium battery or batteries will be needed to provide 24V to the electric motors and another 250 Watts of power to the mower in order to run these system.(Fig. 10) Features: - Voltage – 24V, Weight – 1.05 Kg., Height – 7.1875 inches

(Fig. 10) A Typical view of Battery 22

3.2 Specifications:Voltage (volts)

24

Assembled Height(inches) Blade Length

41.5

Charge (hours)

13 inches.

time

Cutting Options Fuel Type

Lawn Type

12

Assembled Depth(inches) Assembled Width(inches) Features

Bag, Mulch

Walk Behind

Mower Width

Mulching Capability

Yes

Number adjustable handlebar positions

Total no. wheels

45 min./fully charged battery 90(apex.)

13 inches Bag Kit, Batteries

Manual Push Mower (Type of power)

3.5

Product weight(lb.) Start type

Bagger , push handle , Four wheels, height adjustment , Toolfree adjustments Yes

Cutting Width

Maximum cutting height (inches)

Run Time (min.)

21.5

Cordless

Rechargeable Included Battery Mower

61

Deck

Electric

14 inches

of

Size of yard

2

¼ - ½ Acre

Front Wheel size Dia.

8 inches

Electric of

4

8 inches Rear Wheel Size Dia. Speed of the electric motor (Table No. 1)

3000 r.p.m.

Specifications of battery powered Lawn Mower 23

3.3 Methodology adopted for assembling of Lawn Mower:-

1) First we are cut the iron pipe whose outer diameter is 1”, and then welded together at an angle of 90˚ between each other. (1.5 × 2.5 feet’s, Base of the main frame). 2) Then the push Handle (3 feet’s) are welded at the rear wheels frame. 3) Now, four wheels are attached to the frame. The diameter of the wheels is 8” each. 4) Assemble the wheels:(a) Put the wheels, and the screws on the Mower. (b) Pull the screws using the supplied Screwdriver to tighten. 5) A wooden ply are placed and fitted on the base frame of size 1.5 × 2.5 feet’s. 6) Now, the 24v Electric DC motored are placed and fitted by the supporters, at the center of the wooden ply. 7) Assemble the Blade: - Now, Blade are fitted at the bottom side of the lawn mower, to the shaft of the motor. (Fig. 11) These blade is fitted by the bolts.

(Fig. 11) Assembling the Blade with the Electric Motor’s Shaft 24

8) Assemble the battery: - The 24v Lithium ion battery is assembled at the rear wheels of the wooden ply. 9) Now, the battery and the motor is attached for giving electric power to the motor. 10) The switch is attached to the battery for ON/OFF the power supply. 11) Now, testing the Lawn Mower on the ground.

3.4 Technical Specification Motor Power

250W

Motor Model

24V D.C.

Battery Specification

24V/7Ah

Battery charge time

10 to 12 hours

Cutting height

3.5”

Wheel Diameter

8 inches

Wheel width

2 inches

(Table no.2) Some Other Specifications

3.5 Methods of Use 3.5.1 Starting:Press the main Switch, to give the power supply from the battery to the electric motor, for start the rotation of the cutting blade.

25

3.5.2 Moving:Place the lawnmower on the edge of the lawn, switch on the lawnmower and walk through the lawn. When mowing do not allow the motor to labor particularly in heavy conditions. When the motor labors the speed of the motor drops and you will hear a change in the motor sound, when this occurs stop mowing, release the switch lever and raise the height of cut. Failure to do so will reduce area of cut and could damage the product or battery. Protect the battery from heat, for example, also the continuous exposure to sun radiation and fire. Product will not function if temperature is below 0 ℃ or above 45℃. Do not leave the battery in the mower in direct sunlight.

3.5.3 Area of cut (battery duration):1) The area of cut (battery duration) depends on lawn conditions, grass density, moisture content, grass length and height of cut. 2) Switching the product on and off frequently during cutting will also reduce the area of cut (battery duration). 3) To improve the area of cut (battery duration) it is recommended to cut more frequently, raise the cutting height and walk at a normal pace.

3.5.4 Setting the cutting depth:Switch off the motor and remove the contact key. Push the adjust lever out to the direction of wheel. The Maximum cutting height is 3.5 inches.

3.5.5 Charging the battery:Caution! The charger must only be operated in dry rooms. General charging instructions To prolong the service life of the battery, read the following instructions: 26

1) To charge the battery, first switch from the mower. 2) Then open the battery compartment cover and remove the battery. 3) Connect the battery with the included charging cable. On charger will light a red LED. Once the download is complete, it turns to green. Insert the battery into the mower. You can take the lawn mower now in operation. 4) Red LED is on: - Battery is being charged. 5) Green LED is on: - charge process completed. 6) If the charger is connected to a power socket without a battery, the Green LED is on.

3.5.6 Maintenance:Caution! Before carrying out maintenance or cleaning work: 1) Remove the contact key. 2) Remove the battery. 3) Do not touch rotating blades.

3.5.7 Replacing the cutting blade:To replace the blade, proceed as follows: 1) Loosen the nut and washer please in the middle of the blade. 2) Remove the old blade and replace it with a new Cutting knife. 3) Place washer and then nut and tighten everything tight. 4) Check to see if the blade can rotate freely.

3.5.8 Replacing Fuses:To replace the fuse, turn down the safety button with the Marked "FUSE" in the direction indicated. Remove the old fuse and replace with a new one. Then, turn the locking button re-tighten. 27

3.5.9 Cleaning Blade:Grass collector and underbody should be cleaned after used each time. Use a piece of wood and a cleaning rag. Caution! Wear gloves when doing this work. Never use water jet or high pressure cleaning. Aggressive or corrosive cleaners should not be used.

3.5.10 Dispose of batteries:Don’t throw the batteries into the garbage, fire or water since 01.10.1998, all used batteries are not allowed to be thrown into the trash. The batteries need to be handled-bring back to the Battery-box or to the local collection communities. Please help to do anything that benefits our environment: Talk to your relatives, acquaintances and friends.

3.5.11 Dispose-Recycling:Dispose your tool environmentally. Electric tools are not allowed to be disposed into household rubbish. Send the tool to an appropriate collection facility-inquire your local authority about this. The plastic and metal parts can be sorted separately and thus be recycled.

28

Chapter 4 RESULTS AND DISCUSSIONS

4.1 Results:1) The area of cut (battery duration) depends on lawn conditions, grass density, moisture content, grass length and height of cut. 2) Switching the product on and off frequently during cutting will also reduce the area of cut (battery duration). 3) To improve the area of cut (battery duration) it is recommended to cut more frequently, raise the cutting height and walk at a normal pace. 4) The maximum cutting height is 3.5 inch. 5) The run time is 45 min. / fully charged batteries.

4.2 Discussions:Below 40 degrees of inclination angle of the push handle, the mower handle becomes very uncomfortable to handle and pushing the mower becomes quite difficult. At an angle of 45 degrees, the handle is found most convenient in terms of freedom in moving the mower. In future we can add the Remote sensors to the Lawn Mower to operate it by the remote control.

29

REFERENCES

(1) Kinnander, Ola (October 25, 2012). "Rise of the Lawn-Cutting Machines". Bloomberg Businessweek. (2) Everett G., "Improvement in Lawn-Mowers", published 23 February 1869, see Page 1. (3) The

Old

Lawnmower

Club.

"Mower

History".

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