K Ramesh* et al ISSN 2319-2690
International Journal for Research in Science & Advanced Technologies
Volume-3, Issue-6, 092-098
DESIGN AND FABRICATION OF WEED REMOVING MACHINE
K.RAMESH1 , G.TERENCE ANTO 2, S.MAHESWARAN 3, S.BIRUNDHA DEVI4
1
(Asst.professor of Mech. Engineering, SNS College of Engineering, Coimbatore, India)
234
(Department of Mech. Engineering, SNS College of Engineering, Coimbatore, India)
1
rameshkrishnanp87@gmail.com
2
terenceanto1111@gmail.com,3mahesme91@gmail.com,4birundha2704@gmail.com
ABSTRACT arises or it is becoming the need of the day. With this in
In today’s world every thing is getting mind, a simple machine has been designed and
modernized. Agriculture fields are slowly destroying fabricated for removal of weed and unwanted plants
and these lands are used for some other purpose. This is between the rows of paddy plants. As the machine is
because the income from agriculture is less although the moving the weed remover removes the weeds present
work involved is high. Most of the field work is done between the plants. This machine can be used
manually and so the farmers depend on the field workers effectively in the agricultural fields such as paddy field.
for doing it. Because of the higher pay offered in other To use this machine in agriculture field the seeds should
sectors like construction, workers prefer those jobs and be sowed at a distance equal to or more than the width of
so agricultural sector takes shortfall of manpower. This this machine.This machine is of simple design without
being the scenario, workers are not available for the using any motor or engine. Only a chain and sprocket
works such as plucking out the unwanted grass and arrangement is used. This machine eliminates the need
weeds growing in between the plants. It is very for many workers and makes the work easier,
important to pluck out the grass and weeds in order to economical and efficient.
obtain fruitful results from the cultivation, as the grasses
and weeds observe a part of nutrition given to the
plants.Given the present situation, removing weeds 2.LITERATURE SURVEY
becomes a costlier affair. In order to address this
problem, this project proposes a simple, economical and Removing the weeds by using this method is
efficient machine to remove the weed, which would be difficult, time consuming and cost is also more. In this
operated by a single person – savings of labour as well project we have designed and fabricated a weed
as time. The machine has been designed, fabricated and removing machine of mechanism which is innovate and
tested. which is not available in the market.
3. SPECIFICATION OF THE MACHINE
Keywords—weedremover,analysis,design,fabrication
Height of the machine : 1m
1.INTRODUCTION
With agriculture facing a shortage of manpower, Width of the machine : 0.55m
need for automating the various activities in the field Breadth of the machine :0.75m
Nov-Dec 2014 EDITION
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K Ramesh* et al ISSN 2319-2690
International Journal for Research in Science & Advanced Technologies
Volume-3, Issue-6, 092-098
Weight of the machine :50kg
Width of the weed removed
by the cutter (Cutter width) :0.4m
Average speed of weed remover :150rpm
Average travel speed of the machine :50rpm
For one revolution of the
handle, the depth of cut : 6mm 5. DESIGN AND ANALYSIS OF WEED
REMOVING MACHINE
4. PROCESS CHART FOR FABRICATION
5.1 DESIGN OF WEED REMOVING MACHINE
DESIGNING
MATERIAL
PURCHASING
MARKING
CUTTING
Fig 1 design of weedremoving machine
LATHE
OPERATING 5.2 ANALYSIS OF WEED REMOVING MACHINE
Fig 2 DEFORMATION Fig 3 STRESS
DRILLING
OPERATION
WELDING
OPERATION
Fig 4DEFORM UNDEFORM Fig 5 WEED REMOVER
CHECKING
ASSEMBING
CHECKING
PAINTING
Nov-Dec 2014 EDITION
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K Ramesh* et al ISSN 2319-2690
International Journal for Research in Science & Advanced Technologies
Volume-3, Issue-6, 092-098
S.NO PARTS OPERATION MACHINE TOOL BEFORE WEED REMOVING After WEED REMOVING AFT
1. Frame Cutting, Gas cutting O2 +
Drilling, equipment, LPG Gas
Drilling &
Welding Welding Twist
machine drill,
Electrode.
2. Shaft Machining, Lathe, Gas Single
drilling, cutting point
Table 1 OPERATION PLANNING
cutting cutting
tool,
Twist
drill, TABLE2 COST INCURRED
Electrode.
3. Weed Cutting, Gas cutting O2 +
Remover Welding equipment, LPG Gas, COMPONENT NAME PRICE IN Rs
welding
machine Electrode. Frame 1585
4. Spindle Square Lathe Threading Slider 250
threading tool
Bearing 300
5. Nut Square Lathe Threading Spindle 200
threading tool
Handle 50
Analysis of the weed
Shaft 300
remover is done using Ansys
Rear wheel 300
software. 40N is load applied over the cutter in
Front wheel 200
analyzing.
Welding work 750
Why 40N was selected?
Painting 350
We wounded a rope between the anvil and the
Weed Remover (cutter) 800
spring balance. Spring balance was kept stationary and
the anvil was used for weeding operation. 4kg was the Small Sprocket 35
reading we got in the spring balance. 4kg = 40N. Thus
40N was used in the analysis. Big Sprocket 65
Nut 110
Chain Tension 30
TESTING Ideal Sprocket 35
Fig5 Fig 6 Steering 175
Nov-Dec 2014 EDITION
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K Ramesh* et al ISSN 2319-2690
International Journal for Research in Science & Advanced Technologies
Volume-3, Issue-6, 092-098
Spring 15 = 10.5mm Mean diameter
obtained is, d= 22mm.
Lathe work 500 Mean diameter of the spring, D
~ 10mm We know,
Transport 150
We know deflection, y= d=do-(P/2) where
Total 6200 ((8*P*C3*n)/ (G*d)) do is the outer diameter
5= 22=do-(6/2)
((8*200*3.53*n)/ ((.8^5)*d))
TABLE3 DESIGN CALCULATION There fore the outer diameter
Thus, n=18.5 obtained is do=25mm.
SPRING: SQUARE THREAD ROD:
Number of turns, n
Material chosen is High carbon ~ 20
steel (HCS).
For the one revolution of the SHAFT:
Let C= (D/d) = 3.5, and deflection handle, SPROCKET AND CHAIN:
y= 5mm.
the up and down motion
Ks = ((4C – 1)/(4C-4))+ (.615/C) required is 6mm. Material chosen for the shaft is
mild steel (C45) For 1 rotation of the wheel the
= ((4(3.5) – 1)/(4(3.5)-4))+ There fore the let the pitch weed remover
(.615/(3.5)) value be p= 6mm. Shear stress for this material, fs
=360N/mm2 should rotate 3 times that is the
= 1.5 Maximum load that can be requirement.
applied over it is W=100N, taken from the PSG data book.
The stress for HCS from PSG data There fore the speed ratio
book is Let the helix angle be α = 5˚ Let d and l be the diameter and required is i =3.
length of the shaft respectively.
τ = 480 N/mm2 For square thread, coefficient So, we choose Big sprocket of
of friction, We know, Torque, Mt = diameter d1=150mm.
Let the factor of safety is 2. ((π/16)*(fs *d3))
µ = tan φ = 0.08. Small sprocket of diameter
Therefore the design stress take is = ((π/16)*(360 d2=50mm.
τ = 240 N/mm2 There fore φ = 5˚ *d3)) --- a
Thus satisfying the condition,
Maximum load acted over the We know Torque T= P*(d/2) The length of the shaft required is (d1/ d2) = i.
spring is P=200N. 500mm.
Where, P= load in N,
We know τ = ((Ks*8*P*C)/ Since the angle of twist will be
(π*d2)) d= mean diameter of very small,
the square thread rod.
240 = ((1.5*8*200*3.5)/ let the angle of twist be θ = 0.2.
(π*d2)) Let the torque be 200Nmm.
We know, θ = ((Mt * l)/ (G*J)) ---
Thus d = 2.5mm. --b
Rod diameter of the spring, There fore, T= P*(d/2) Where, J = ((π*d4
)/32) ------c
d~ = W*(tan (α+
3mm. φ))*(d/2) Substituting a and c in b we get,
D= (C*d) = 3.5*3 200= 100*(tan (5˚+ θ = ((2*360*500)/
5˚))*(d/2) (.8*(10^5)*d))
Nov-Dec 2014 EDITION
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K Ramesh* et al ISSN 2319-2690
International Journal for Research in Science & Advanced Technologies
Volume-3, Issue-6, 092-098
0.2= ((2*360*500)/
(.8*(10^5)*d))
d = 22.5
Diameter of the shaft is d ~
25mm
6.ADVANTAGES AND DISADVANTAGES
ADVANTAGES
Mechanism is a simple one.
Fig 7 Dimensions of weed remover (cutter)
Motor or Engine is not required.
One Labour is enough for operation.
Working is very easy compared to primitive work method. 7.CONCLUSION AND FUTURE WORKS
Initial and maintenance cost are less.
This machine adds to the modernization of the
Time consumption is less for weeding.
agriculture. A machine like this will make the farmer to
DISADVANTAGES be independent and not rely on the labourers for
Rotation of weed cutter is slower, so weed removal rate is removing weed. Since the break even can be achieved in
less. the first year itself, the savings would be enormous in
More skilled Labour is need
the consecutive years. This machine would be further
tested in the fields and based on the feed back from the
farmers, the design would be optimized and
improvements made. Although the machine cost seems
to be high, once mass produced, the cost can be
drastically reduced.
FUTURE WORKS
Engine is to be set for effective weeding
operation.
Profile of the weed remover blades should be
optimized.wheel with buttons should be used for
easy movement of the machine over the mud.
Nov-Dec 2014 EDITION
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K Ramesh* et al ISSN 2319-2690
International Journal for Research in Science & Advanced Technologies
Volume-3, Issue-6, 092-098
REFERENCE
PSG design data book.
“Machine Design” book by R.S.Kurmi and J.K.Gupta.
The Elements Of Mechanical Design By James G Skakoon.
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