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Development and Evaluation of an Electric Lawn Mower

Md. Golam Mostafa
Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

A.T.M. Ziauddin
Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Md. Hafizuddin
Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

An electric operated lawn mower was developed and was evaluated in the Botanical garden of Bangladesh Agricultural University. The effective filed capacity and the cutting efficiency of the mower using cutter with three blades were 0.02148 ha/hr and 99.4% respectively. While the effective field capacity of the mower using cutter with two blades and twisted steel wire were 0.01934 ha/hr and 0.0154ha/hr, respectively. The cutting efficiency of the mower using cutter with two blades and twisted steel wire were 98.4% and 86.1%, respectively. The results indicated that the lawn mower using cutter with three blades could be used with high satisfaction.

Keywords: Development, Evaluation, Electric lawn mower

Location: Botanical garden of Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Farm Mechanization

Commodity: Product development

Objectives:

1) To develop and electrically operated lawn mower, and

2) To evaluate the mower in the field

Methodology:

The literature search indicated that the specific power requirement for cutting lawn grasses was about 1.6 kW.m of cutting width. The specific power requirement of 1.82 kW/m has been considered for the development of the mower.The recommended peripheral velocity for cutting grass ranges from 27 m/s and 28.5 m/s. The rpm of the motor was chosen at 2900 which provide a peripheral velocity 30.82 m/s. To meet the power requirement and peripheral velocity and to cut the grass successfully, a single phase induction motor of 0.370 kW (0,5 hp) with 2900 rpm was selected. Mild steel plate of 203 mm length, 25 mm width and 1 mm thickness has been used to fabricate the cutting blade of the mower. This dimension was selected by considering the power and velocity requirement of the mower. Three types of grass cutter were fabricated in the workshop of the Department of Farm Power and machinery of Bangladesh Agricultural University. These include a cutter with three blades a cutter with two blades and a twisted steel wire. Besides these, nylon rope (2 mm) was used as grass cutter. The frame of the lawn mower. I was made of MS angle bar ( 25 mm X 25 mm). The shaft was made of MS rod of diameter of 21 mm and of length of 300 mm. The wheel was made of MS plate (25 mm) and the diameter of the wheel was made 150 mm. The overall length of the frame was 310 mm and the width of the frame was 166 mm. The handle was made of wood and the length of handle was 1280 mm. A person of average weight could easily operate the mower. The lawn mower was tested and evaluated in the Botanical garden of Bangladesh Agricultural University, Mymensingh. Cutter with three blade and two blades, twisted steel wire of length 101.5 mm, and nylon rope of length 101.5 mm have been used during testing the mower. An area of 6.096 m X 4.060 m was considered to conduct the experiment. The lawn grass was cut by the electrically operated mower and the mower was pushed by an operator at his normal walking speed. The power consumed and the time taken was measured by a watt-meter and a stop watch, respectively. Five replication were taken for each type of cutter. The cutting efficiency, effective field capacity and cost of operation of the lawn mower were calculated. Besides, cost of operation for other available mower such as engine operated mower and manually operated push type mower were also calculated and compared.

Source of Information: J. of Agril. Mach. & Mech. 2 (1) 1995 : 31-36, ISSN 1024-6290

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The efficiency of the electric lawn mower using cutter with three blades, two blades and twisted steel wire were 99.4%, 98.4% and 86.1% respectively. The mower using cutter with three blades was the best in terms of efficiency. The effective field capacity of the mower using cutter with three blades was 0.02148 ha/ha. Among all the cutters tested, the cutter with three blades was the best in terms of cutting efficiency and effective field capacity. The cost per hectare by the mower using cutter with three blades proved to be the minimum among the three types of cutter and even the operational cost was the minimum as compared with the available mower such as engine operated mower and manually operated push type mower. The electric lawn mower is very cheap, easy to operate and the cutting efficiency is very high. This device could be used economically and efficiently to the lawns, play grounds and gardens of various institutes.

Knowledge Management: Journal