Abstract:
Gears are used in various machines and industries for transportation and transmission of power.
Other uses are in consumer electronics and many machines used in homes like the washing machines, electric
drills and kitchen appliances. Gears come in different sizes ranging from a module of 0.5 to 100 mm. Currently
there is a problem of accurately machining gears. This is due to inaccurate positioning of the blank and cutter.
The objective of the study was to investigate and determine the appropriate way of producing quality and
accurate gears most economically through the use of a circle as a substitute to involute profile in gear cutting.
Two different gears of same dimensional characteristics were cut; one using a Computer Numerical Control
machine utilizing circle profile and the other using conventional milling machine. Dimensional comparisons
were made of the two cut gears against an actual involute profile to determine the margin of error. The circle
involute profile made using CNC was found to be exactly as the true involute profile though an error of 0.078
mm was observed in some sections of the profile. For the hobbing case, it was impossible to accurately machine
the actual depth and as such, the intended depth of 7.32 was surpassed by 0.2 mm. The tooth was thicker
throughout the length of the profile and the fillet radii lucked homogeneity. The involute circle approach was
therefore successful and as such can benefit all CNC users and gear cutters in producing accurate gears cheaply.
