š Key Concepts
ā¢ Gear tooth profile is the shape of the side of the tooth, from root to tip, not just a distance or circle
ā¢ In the illustration, some letters mark lengths or radii (like diameters or pitches), while others follow along a curved surface
ā¢ Focus on which label is drawn along the full side of a tooth rather than between two specific points
š Think About
ā¢ Look at each labeled item F, H, I, and J and ask: is this marking a curve/shape or a straight measurement like height or thickness?
ā¢ Which label appears to trace the working surface where two gear teeth actually slide or roll against each other?
ā¢ Does the label you choose follow the contour of the tooth flank from near the root toward the tip, instead of just across the top or across the space?
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Before You Answer
ā¢ Verify that your choice shows a continuous contour instead of a single arrow straight across a gap or diameter
ā¢ Check that the label is applied to one side of one tooth, not an entire circle or across multiple teeth
ā¢ Confirm your choice matches the usual idea of a tooth flank shape (profile), not pitch, clearance, addendum, or dedendum