# Eme 2101 61 introduction 64 3 draw the fillet arc

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EME 2101: 6.1 Introduction643. Draw the fillet arc using a visible line, Figure 6.4.Figure 6.4: Construction of the fillet arc
EME 2101: 6.1 Introduction656.1.4To draw the teeth of a standard gear by approximate arc method1. Lay off the pitch circle, the root circle and the addendum circle2. Starting with the pitch point, divide the pitch circle into distances equal to the circularthickness of the tooth3. Draw the pressure line through the pitch point4. Draw the base circle, tangential to the pressure line.5. With the compass set to a radius equal to the distance from the pitch point to the end ofthe pressure line on the base circle (radius of curvature), strike arcs through the divisionpoints on the pitch circle, with the center on the base circle.6. Darken the arcs for the tops of the teeth and bottom of the spaces and add tooth fillets tocomplete the gear teeth as shown in figure 6.5.Figure 6.5: Gear teeth drawing by approximate arc method
EME 2101: 6.1 Introduction66Figure 6.6: Meshing pair of gears

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