Arc of Approach
While the contact-point of a pair of mating teeth is travelling along the path of contact towards the mesh-point, the teeth are said to be in the 'Arc of Approach'; afterwards they are in the 'Arc of Recession'.
From Gear Data
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Arc of Approach
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| The
arc of the pitch circle through which a tooth profile travels from its contact-point
until the point of contact arrives at the mesh or pitch-point. While the contact-point of a pair of mating teeth is travelling along the path of contact towards the mesh-point, the teeth are said to be in the 'Arc of Approach'; afterwards they are in the 'Arc of Recession'. |
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| Whereas: From Gear Data |
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