### How the Report Relates to the Measured Gear

It is helpful to understand how gear teeth are numbered and how the right and left flanks of the gear tooth are determined.

Tooth #1 is the gear where measurement begins based upon the start angle. Subsequent teeth are numbered according to the order that measurements are taken.

To determine the right and left flanks, the rules are:

- For an external gear, imagine that you are standing at the center of the gear and looking forward at the gear's tooth. The left flank is on the left side of the tooth, and the right flank is on the right side of the tooth.

- For an internal gear, imagine that you are standing at the center of the hole and looking at a space between two teeth. The left flank is on the left side of that space, and the right flank is on the right side.