Pedal Operated Power

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Page 1

PROJECT REPORT

on

Pedal Power Hacksaw

ABSTRACT

In this Pedal operated hacksaw machine which can be used for industrial applications

and Household needs in which no specific input energy or power is needed. This project

consists of a crank and slider mechanism. In the mechanism pedal is directly connected

to the hacksaw through crank and slider mechanism for the processing of cutting the

wooden blocks, metal bars, pvc materials. The objective of the modal is using the

conventional mechanical process which plays a vital role. The main aim is to reduce

the human effort for machining various materials such as wooden blocks, steel, PVC

etc.

The power hacksaw machine, which runs on human power, works on the

principle of the conversion of rotational motion to oscillatory motion.

Importance of this project lies in the very fact that it is green project and helps us to

reduce our electricity need. Secondly, this cutter can be used and transferred to our

working place easily. Moreover, if we want we can generate electricity with our project

by connecting it to dynamo, diode and battery.


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INDEX

SR.

NO

TOPICS NAME PAGE NO.

1. Introduction Of Project 6

2. Component required 7

3. Working principle 19

4. Designing Aspects and Parts Details/Drawings 20

5. Advantages and Disadvantages 24

6. Cost estimation 25

7. Future Modifications 26

8. Conclusions 30

9. References 30


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LIST OF TABLE 14

LIST OF FIGURE

CHAPTER 1

INTRODUCION 6

CHAPTER 2

COMPONENTS REQUIRD 7

2.1) Pedal power hacksaw 7

2.1.1)Selecting A Power Hacksaw blade 9

2.1.2) Mounting a Power Hacksaw blade 11

2.1.3) Selecting a Band Saw Blade 11

2.1.4) Installing a Band Saw Blade 12

2.2) Pedal arrangement 13

2.2.1) Pedal 13

2.3) Stand Setup Parts 14

2.4) Crank And Slider Mechanism 16

2.5) Metal Slab 17

2.6) Bicycle Seat 18

CHAPTER 3

WORKING PRINCIPLE 19

CHAPTER 4

DESIGN 20

4.1 Base Frame 20

4.2 Upright Support 21

4.3 Hacksaw blade 22


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4.4 Design Consideration 22

CHAPTER 5

ADVANTAGES 24DIS ADVANTAGES

CHAPTER 6

COST ESTIMATION 25

CHAPTER 7

FUTURE SCOPE 26

CHAPTER 8

CONCLUSION 30

CHAPTER 9

REFERANCES 30


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LIST OF FIGURE

SR NO FIGURE NAME PAGE NO

1 Pedal power Hacksaw cutting system 19

2 Power Hacksaw blade 21

3 Power Hacksaw blade cutting operation 23

4 Pedal 24

5 Pedal power attachment 25

6

Bicycle Stand/Carrier 267 crank and slider mechanism 27

8 Metal slab 28

9 Metal slab 28

10 Bicycle sea 29

11 Working 30

12 Base Assembly 31

13 Upright Support Assembly 32

14 Hacks blade 33

15 Rice Threshing 37

16 Winnowing 37

17 Corn Shelling 37

18 Peanut Shelling 38

19 Operating a Circular Saw 38

20 Water Pumping from a Shallow Well 38

21 Operating a Wood Working Lathe 39


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CHAPTER 1 INTRODUCTION

Pedal power is the transfer of energy from a human source through the use of a foot pedal and crank

system. This technology is most commonly used for transportation and has been used to propel

bicycles for over a hundred years. Less commonly pedal power is used to power agricultural and

hand tools and even to generate electricity. Some applications include pedal powered laptops, pedal

powered grinders and pedal powered water wells. Some third world development projects currently

transform used bicycles into pedal powered tools for sustainable development. This projectconcentrates on pedal powered hacksaw machining.

An individual can generate four times more power (1/4 HP) by pedaling than by hand-cranking. At

the rate of ¼ HP, continuous pedaling can be served for only short periods, approximately 10

minutes. However, pedaling at half this power (1/8 HP) can be sustained for close to 60 minutes but

power capability can depend upon age . As a consequence of the brainstorming exercise, it was

apparent that the primary function of pedal power one specific product was particularly useful: the

bicycle. Many devices can be run right away with mechanical energy.

A saw is a tool that uses a hard blade or wire with an abrasive edge to cut through softer materials.

The cutting edge of a saw is either a serrated blade or an abrasive. A saw may be worked by hand,

or powered by steam, water, electric or other power. An abrasive saw uses an abrasive disc or band

for cutting, rather than a serrated blade.


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CHAPTER 2 COMPONENTS REQUIRED

I. Hack saw blade

II. Pedal arrangement

III. Stand setup parts

IV. Crank and slider mechanism

V. Hack saw assembly

VI. Metal slab

2.1) PEDAL POWER HACKSAW

The principle of pedal power hacksaw is to change circulatory motion or cycling motion into

translatory motion with the help of metal cutting rod. This is mainly used for cutting metals and

plastics. it is manually pedal operated system.

If we use dynamo then we can produce electricity which will be help to lighting the work piece area

when electricity is not available in mechanical workshop.

A hacksaw is a fine-tooth saw with a blade under tension in a frame, used for cutting materials such

as metal or plastics.

Hand-held hacksaw consist of a metal arch with a handle, usually a pistol grip, with pins for attaching

a narrow disposable blade.

A screw or other mechanism is used to used to put the thin blade under tension.

It is a fine tooth hand saw with a blade under tension. It is used to cut metals and PVC pipes. It

would be useful in many projects discussed on this site which used plastic pipes as materials. Blades

of hacksaw are measured in TPI (Tooth Per Inch). Different TPI is needed for different jobs of

cutting.


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There are three types of cutters available in the market:

1.

Simple hacksaw which can be used for hand cutting things.

2. Small Electrically Hacksaw for personal uses.

3. Large Cutter Machines used for Industrial Purposes.

From the above three, first one will be used for our project

Fig 1-pedal power hexo cutting system


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A RECIPROCATING POWER HACKSAW

It uses a blade that moves back and forth across the work. The blade cuts on the backstroke. There

are several types of feeds available.

Positive feed-produces an exact depth of cut on each stroke. The pressure on the blade varies with

the number of teeth in contact with the work.

Definite pressure feed-yields a pressure on the blade that is uniform regardless of the number of

teeth in contact with the work. The depth of the cut varies with the number of teeth contacting the

work. This condition prevails with gravity feed.

Feed can be adjusted to meet varying conditions. For best performance, the blade and feed must be

selected to permit high-speed cutting and heavy feed pressure with minimum blade bending and

breakage.

Standard reciprocating metal cutting saws are available in sizes from 6~ ~ 6~ (150 mm ~ 150 mm)

to 24~ ~ 24~ (900 mm ~ 900 mm). The saws can be fitted with many accessories, including quick-

acting vises, power stock feed, power clamping of work, and automatic cycling of the cutting

operation. The latter moves the work out the required distance, clamps it, and makes the cut

automatically. The cycle is repeated upon completion of the cut.

High-speed cutting requires use of a coolant. Coolant reduces friction, increases blade life, and

prevents chip-clogged teeth. Cast iron and some brass alloys, unlike most materials, do not require

coolant.

2.1.1)

Selecting A Power Hacksaw blade

Proper blade selection is important. Use the three-tooth rule at least three teeth must be in contact

with the work. Large sections and soft materials require a coarse-tooth blade. Small or thin work

and hard materials require a fine-tooth blade.

For best cutting action, apply heavy feed pressure on hard materials and large work. Use light feed

pressure on soft materials and work with small cross sections.


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Blades are made in two principal types: flexible-back and all-hard. The choice depends upon use.

i) Flexible-back blades -should be used where safety requirements demand a shatterproof blade.

These blades should also be used for cutting odd-shaped work if there is a possibility of the work

coming loose in the vise.

ii) All-hard blade -For a majority of cutting jobs, the all-hard blade is best for straight, accurate

cutting under a variety of conditions.

When starting a cut with an all-hard blade, be sure the blade does not drop on the work when cutting

starts. If it falls, the blade could shatter and flying pieces cause injuries.

Fig 2- Power Hacksaw blade

Blades are also made from tungsten and molybdenum steels, and with tungsten carbide teeth on steel

alloy backs. The following “rule-of-thumb” can be followed for selecting the correct blade:

Use a 4-tooth blade for cutting large sections or readily machined metals.

Use a 6-tooth blade for cutting harder alloys and miscellaneous cutting.


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Use 10- and 14-tooth blades primarily on light duty machines where work is limited to small sections

requiring moderate or light feed pressure.

2.1.2) Mounting a Power Hacksaw blade

The blade must be mounted to cut on the power (back) stroke. The blade must also lie perfectly flat

against the mounting plates. If long life and accurate cuts are to be achieved, the blade must be

properly tensioned

Many techniques have been developed for properly mounting and tensioning blades. Use a torque

wrench and consult the manufacturer ’s literature. If the information (proper torque for a given blade

on a given machine) is not available, the following methods can be used:

Tighten the blade until a low musical ring is heard when the blade is tapped lightly. A high pitched

tone indicates that the blade is too tight. A dull thud means the blade is too loose. The shape of the

blade pin hole can serve as an indicator of whether the blade is tensioned properly. When proper

tension is achieved, the pin holes will become slightly elongated,

The blade will become more firmly seated after the first few cuts and will stretch slightly. The blade

will require retensioning (retightening) before further cutting can be done.

2.1.3) Selecting a Band Saw Blade

Band saw blades are made with raker teeth or wavy teeth. Most manufacturers also make variations

of these sets. The rakersetis preferred for general use.

Tooth pattern determines the efficiency of a blade in various materials. The standard tooth blade

pattern is best suited for cutting most ferrous metals. A skip tooth blade pattern is preferred for


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cutting aluminum, magnesium, copper, and soft brasses. The hooktooth blade pattern also is

recommended for most nonferrous metallic materials.

For best results, consult the blade manufacturer ’s chart or manual for the proper blade characteristics

(set, pattern, and number of teeth per inch) for the particular material being cut.

2.1.4) Installing a Band Saw Blade

If the saw is to work at top efficiency, the blade must be installed carefully. Wear heavy leather

gloves to protect your hands when installing a band saw blade.

Blade guides should be adjusted to provide adequate support, Proper blade support is required to cuttrue and square with the holding device.

Follow the manufacturer ’s instructions for adjusting blade tension. Improper blade tension ruins

blades and can cause premature failure of bearings in the drive and idler wheels.

Cutting problems encountered with the band saw are similar to those of the reciprocating hack saw.

Most problems are caused by poor machine condition. They can be kept to a minimum if a

maintenance program is followed on a regular basis.This typically includes checking wheel

alignment, guide alignment, feed pressure, and hydraulic systems.


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Fig 3- Power Hacksaw blade cutting operation

2.2) PEDAL ARRANGEMENT

A pair of pedals is attached to the stand setup in which the power will be generated manually. A

typical Bicycle arrangement is used.

2.2.1) PEDAL

A bicycle pedal is the part of a bicycle that the rider pushes with their foot to propel the bicycle. It

provides the connection between the cyclist’s foot or shoe and the crank allowing the leg to turn the

bottom bracket spindle and propel the bicycle's wheels.

http://en.wikipedia.org/wiki/Bicyclehttp://en.wikipedia.org/wiki/Cycling_shoehttp://en.wikipedia.org/wiki/Cycling_shoehttp://en.wikipedia.org/wiki/Cranksethttp://en.wikipedia.org/wiki/Bottom_brackethttp://en.wikipedia.org/wiki/Bottom_brackethttp://en.wikipedia.org/wiki/Bottom_brackethttp://en.wikipedia.org/wiki/Bottom_brackethttp://en.wikipedia.org/wiki/Cranksethttp://en.wikipedia.org/wiki/Cycling_shoehttp://en.wikipedia.org/wiki/Bicycle


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Fig 4- pedal

Pedals were initially attached to cranks connecting directly to the driven (usually front) wheel. Thesafety bicycle, as it is known today, came into being when the pedals were attached to a crank driving

a sprocket that transmitted power to the driven wheel by means of a roller chain.

Pedals usually consist of a spindle that threads into the end of the crank and a body, on which the

foot rests or is attached, that is free to rotate on bearings with respect to the spindle.

2.3) STAND SETUP PARTS

Stands are introduced to immobilize the apparatus. Various components used are fixed to this

arrangement. The chassis of the bicycle is used as the stand setup parts .

The stand described here is designed to support most bicycles.

http://en.wikipedia.org/wiki/Safety_bicyclehttp://en.wikipedia.org/wiki/Safety_bicyclehttp://en.wikipedia.org/wiki/Sprockethttp://en.wikipedia.org/wiki/Roller_chainhttp://en.wikipedia.org/wiki/Roller_chainhttp://en.wikipedia.org/wiki/Axlehttp://en.wikipedia.org/wiki/Bearing_(mechanical)http://en.wikipedia.org/wiki/Bearing_(mechanical)http://en.wikipedia.org/wiki/Axlehttp://en.wikipedia.org/wiki/Roller_chainhttp://en.wikipedia.org/wiki/Roller_chainhttp://en.wikipedia.org/wiki/Sprockethttp://en.wikipedia.org/wiki/Safety_bicyclehttp://en.wikipedia.org/wiki/Safety_bicycle


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Fig 6- Bicycle Stand/Carrier

1. The stand assembly is divided into two parts: the rectangular base frame and two triangular

upright supports. Measure and cut the five pieces of 3/4" (20mm) angle specified for the base

frame. Mitre the corners at 45 degrees so they fit together tightly and form square corners.

2. Weld the rectangle together. Do not weld the center frame member to the rectangle yet.

3. Measure and cut as specified the 5 pieces for each upright support.

4. Carefully assemble the upright support pieces for welding, being sure to leave a 1/8" (3.2mm)

gap in the base of each support. This gap will mate with the center frame member of the base

frame, allowing the upright supports to slide to accommodate different rear axle widths. Notethat the two upright supports are not identical. They are mirror reflections of one another. Weld

each upright support assembly together into a secure structure.

5. Place the upright supports onto the base frame, and position the center frame member so that

it mates with the gap in the side supports. Mark its position, and weld it in place.


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2.4) CRANK AND SLIDER MECHANISM

This mechanism is used to convert the rotary motion of the crank into the reciprocating motion of

hacksaw. The lengths of the crank and connecting rods are made using trial and error method.

Fig 7- crank and slider mechanism

The hack saw is guided by an aluminum plate. The vertical movement of the hacksaw will be guided

by to iron rods. The vertical movement will act as a feeding unit.


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2.5) METAL SLAB

He used a guide to control the hacksaw blade which is used to cut the metal. Metal slabs were fitted

on the hacksaw blade to ensure pressure on the object to be cut and linear movement of the blade.

A clamp, with 360 degree rotation, was fixed to hold the metal pieces while cutting, and to allow

them to be cut in any shape and angle.

Fig 8- metal slab

Fig 9- metal slab


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2.6) BICYCLE SEAT

Fig 10- bicycle seat

A bicycle seat, unlike a bicycle saddle, is designed to support the rider's buttocks and back, usually

in a semi-reclined position. Arthur Graford is credited with inventing the padded bicycle seat in

1892, and they are now usually found on recumbent bicycles.

Bicycle seats come in three main styles; mesh, hard shell and combination

i)

MESH

A typical mesh seat consists of a metal frame with mesh stretched over it and secured with adjustable

straps, zip ties, string or shock cord.

ii)HARDSHELL

Hard shell seats are normally made of a composite material such as GRP or carbon fiber although

metal and wood versions do exist. A hard-shell seat is normally covered with some-form of padding,

this is usually closed or open cell foam although some extreme racing machines do not have any

padding on the seat to reduce weight and increase efficiency. Hard-shell seats are generally used at

more reclined angles than mesh seats.

iii)COMBINATION

A combination seat has a padded hard seat base with a mesh back.

http://en.wikipedia.org/wiki/Bicycle_saddlehttp://en.wikipedia.org/wiki/Arthur_Garfordhttp://en.wikipedia.org/wiki/Recumbent_bicyclehttp://en.wikipedia.org/wiki/Recumbent_bicyclehttp://en.wikipedia.org/wiki/Recumbent_bicyclehttp://en.wikipedia.org/wiki/Recumbent_bicyclehttp://en.wikipedia.org/wiki/Arthur_Garfordhttp://en.wikipedia.org/wiki/Bicycle_saddle


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CHAPTER 3

WORKING PRINCIPLE

It consists of the pedal arrangement which rotates the crank and through it slider consists of

oscillating mechanism. The power is transmitted to the crank and slider mechanism. This

mechanism is used to rotate the crank disc; the disc which is having an extended rod is connected

to the sliding portion of the hacksaw directly by means of a linkage. The hacksaw is passed through

the guide ways by means of maintaining the cutting axis. As the user operated the pedal, the hack

saw cuts the various materials automatically with less power. The dead weight is for compressive

force while the user operated the foot pedal.

Fig 11- working


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CHAPTER 4 DESIGN

4.1) BASE FRAME

Plan view of frame in support position. All pieces 3/4" (19mm) steel angle.

Fig 12-Base Assembly


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4.2) UPRIGHT SUPPORTS

Make two pieces of upright supports: one as shown and another one a reflection of the one

shown below. All pieces are made of 3/4" (19mm) steel angle, unless specified otherwise. Weld all

joints.

Fig 13-Upright Support Assembly


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4.3)HACKSAW BLADE

Fig 14- hacks blade

4.4) DESIGN CONSIDERATIONS

When designing our attachment, the following considerations were taken into account

1. The device should be suitable for local manufacturing capabilities.

2.

The attachment should employ low-cost materials and manufacturing methods.

3. It should be accessible and affordable by low-income groups, and should fulfill their basic need

for mechanical power

4. It should be simple to manufacture, operate, maintain and repair.

5. It should be as multi-purpose as possible, providing power for various agricultural implements

and for small machines used in rural industry.

6.

It should employ locally available materials and skills. Standard steel pieces such as steel plates,

iron rods, angle iron, and flat stock that are locally available should be used. Standard tools used

in machine shop such as hack saw, files, punches, taps & dies; medium duty welder; drill press;

small lathe and milling machine should be adequate to fabricate the parts needed for the dual-

purpose bicycle.

LENGTH = 15 inch=36 cmWIDTH=1 inch


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7. It should make use of standard bicycle parts wherever possible.

8. The device should adapt easily to as many different bicycles as possible. No permanent structural

modification should be made to the bicycle.

9. Though the device should be easy to take off the bicycle, it is assumed that it would usually

remain attached to facilitate readiness and ease of transport from site to site. The device,

therefore, should not interfere with the bicycle's transportation mode.

10. The broad stand, which provides stability during power production mode, can be flipped upward

during the transport mode. This stand/carrier would be a permanent fixture of the dual purpose

bicycle.

11. The power take-off mechanism should be as efficient as possible, and should develop relatively

high r.p.m. (close to 200) for versatility of application. We had seen designs for devices that

take power from the rear tire by means of a friction roller pressed against it, but we had doubts

about the efficiency of this arrangement. In order to improve efficiency we used hard bearing

surfaces such as roller chains, sprockets and ball bearings. We decided that the most appropriate

location for this power take-off mechanism would be at the front of the bike near the fork tube

(see photographs).

12. Care must be exercised to insure that the power take-off assembly is far enough forward so as

not to interfere with pedaling. Most standard adult bicycle frames have plenty of room for the

power take-off mechanism and pulley. Power is supplied to the shaft by means of a chain from

the bike's chain wheel (crank) to a ratcheted sprocket on the shaft. During the prime-mover mode,

the bike's regular chain is slipped off of the chain-wheel, and the specially sized chain to the

power take-off mechanism is slipped on.

13. The device should be able to transmit power to a variety of machines, and changing drive ratios

should be as simple as possible. We decided that a V-belt and pulley arrangement would be most

appropriate for this. Belts do not require the precise alignment that chains do. Belts can even

accommodate pulleys that are slightly skewed with respect to each other. Changing drive ratios

is as easy as changing pulleys. Also, belts are reasonably efficient.


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14. The device should contain a ratcheting mechanism that would let the operator "coast "

periodically to rest and conserve energy. A free wheel from any bicycle can be easily adapted

for this purpose.

15.

Excessive weight should be avoided, as durability is a prime consideration.

CHAPTER 5

ADVANTAGES

I. Time saving as compared to simple hacksaw

II.

Power saving as it is manually operatedIII. Easy machinery used

IV. As it is pedal operated so good for health

V. Comfortable then ordinary hacksaw

VI. It is portable

VII. It could be used wherever metal cutting is done in small scales, including at construction sites

and furniture units, or to cut metal for window panes.

DISADVANTAGES

I. Its totally manually operated

II. Time consuming as compared to electrical power hacksaw

III. Without human effort its not operated

IV. Not fit for heavy production


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CHAPTER-6 Cost Estimation

SR.NO. NAME OF

COMPONENT

PIECES PRICE/PIECE TOTAL

1 Pedal 2 200 400

2 Stand 1 350 350

3 Base frame 1 750 750

4 Crank& Slider

mechanism

1 900 900

5 Clamp 2 130 260

6 Hacksaw 1 550 550

7 Nut & Bolt 7 10 70


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8 Welding cost - 380 380

TOTAL 3660

CHAPTER-7

FUTURE SCOPE

Following all types of operation can be carried out by the proper pedal attachment as per the

requirement. Here are some operation.

Fig 15- Rice Threshing Fig 16-Winnowing


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Fig 17-Corn Shelling

Fig 18- Peanut Shelling Fig 19- Operating a Circular Saw


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Fig 20-Water Pumping from a Shallow Well


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Fig 21-Operating a Wood Working Lathe


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CHAPTER-8

CONCLUSION

Thus a low cost and simple design pedal operated hacksaw machine is fabricated. This machine

reduces the human effort and hence we don’t need two persons to cut the wooden logs. This simple

design of conventional design which can enhance day today household needs and daily day to day

purposes and it can be also used in for industrial applications during power shut down scenarios.

By using this method we can do any operation as per our requirement without the use of electricity.

so we can save the electrical power.

CHAPTER-9

REFERENCES

[1] David Gordon Wilson “UNDERSTANDING PEDAL POWER” ISBN: 0-86619-268-9 [C]

1986, Volunteers in Technical Assistance” Technical paper 51 VITA 1600 Wilson Boulevard USA.

[2] EJ Yerxa Taylor & Francis “Occupational science: A new source of power for participants in

occupational therapy‟- Journal of Occupational Science ISSN 1442-7591 Volume: 13, Issue: 1,

April 1993 pp254-259.

[3] Jon Leary “Putting Research into Practice: From a Steel City Drawing Board to the Heart of the

Maya” The University of Sheffield-EWB-UK National Research Conference 2010,19th February

2010.

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