Mirror that arc about the start point.ġ1. Draw a concave arc that acts as an extension from the end of the trimmed circles to the one end of the 10percent line.ġ0. Use the 20 percent line and the line on the backside of the circles as trim boundaries to trim down the circles.ĩ. At the end of the 60 percent line draw a vertical line that is 10 percent the length of the Pitch and extends evenly in both directions.Ĩ. At the end of the 20 percent line draw a vertical line that intersects both circles.ħ. From the center of that reference line draw a line out that is 20 percent the length of the Pitch and another that is 60 percent the length of the Pitch. Clear away the reference geometry cluttering the drawing and then draw a line on the backsides of the two circles (will be the length of the pitch).Ħ.
At that intersection draw a line downwards the length of the pitch, and then at each end of that line draw circles whose diameters are the roller diameter plus. Draw a line from the upwards extending line to the intersection of the angled line.Ĥ. Rotate the line extending to the right up an angle of. Pick a start point and draw upwards 1/2 of the pitch, and out to the right some distance (longer than expected gear radius).Ģ. You need to draw the first tooth of the sprocket gear, which is accomplished as follows.ġ.
