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The base diameter can be larger than the root diameter depending upon the input values. To draw the gear teeth profile for this follow the steps in the previous page till step 8.

For step 9:
Use involute curves, outer diameter curve and root diameter edge. Draw two tangent lines from the bottom point of the involute curve as shown in the image below and extend them beyond the root diameter edge. Trim all other entities after that.
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Then follow the same steps mentioned in the previous page to complete the gear.

That's all for this topic. I hope this helped you.