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Design and Development of a Lawn Mower

MA Zami
Principal Scientific Officer
Workshop Machinery and Maintenance Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

BK Biswas
Senior Scientific Officer
Workshop Machinery and Maintenance Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

Md Altaf Hossain
Senior Scientific Officer
Workshop Machinery and Maintenance Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

MA Hossain
Scientific Officer,
Workshop Machinery and Maintenance Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

Grass cutting is one of the major problems for beautification in the office area. Presently it is done by sickle which is laborious and time consuming. Even the performance of the manual operation is not so good. On the other hand, different kinds of lawn mower imported from foreign countries (China, Japan, Thailand etc.) are also used for that purposes. The prices of these mowers are very high and its field capacity/efficiency is also low. Spare parts of those mowers are not available in the market. If it creates problem once it is very difficult to repair. To make the operation quickly, smoothly and efficiently a self propelled lawn mower has been design and fabricated at BRRI workshop. The average fuel consumption, field capacity and field efficiency were 0.60 l/hr, 0.243 ha/hr and 87% respectively. The cutting blade diameter was 80 cm and its speed was 1326 rpm. The forward speed of the field mower was 3.3 km/hr. The cutting height of grass ranged from 4 to 6 cm from the ground surface.

Keywords: BRRI mower, performance,Grass fields

Location: Bangladesh Rice Research Institute (BRRI)

Start Date: 22-02-2009

End Date: 20-04-2010

Program Area: Farm Mechanization

Commodity: Product development

Objectives:

To attach lawn mower with power tiller for increasing field capacity.
To modify the turning system of lawn mower.
To improve the cutting blade of lawn mower.

Methodology:

The complete design of power unit has been done with the help of AutoCAD tools. Fabrication of the power unit has been done at BRRI Research Workshop using the locally available materials. M.S flat bar, M.S sheet, angle bar, shaft, bearing, pulley, nut-bolt etc have been used for fabrication.

Source of Information: Proceeding of the BRRI Annual Research review Workshop,2009-2010, BRRI

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Performance and efficiency of the mower:

The fuel consumption ranged from 0.50 to 0.70 l/hr.
The average field capacity and field efficiency of the mower were 0.243 ha/hr and 87% respectively.
The cutting blade diameter was 80 cm and its speed was 1326 rpm.
The forward speed of the field mower was 3.3 km/hr.
The cutting height of grass ranged from 4 to 6 cm from the ground surface.

The analysis of above result indicated that the mower could be operated with full satisfaction. Furthermore, it could be fabricated nationally with very low cost (Tk. 8,000 without power unit). Also, the operating cost is as low as Tk.300.00/ha (Tk.40/bigha) only. In addition, this mower could easily be attached with power tiller and easy for quick turning.

Knowledge Management: Report/Proceedings