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Excellent video. Definitely a recommendation for anyone who wants to experiment with gears.
Only two negatives: the presenter never shared how to cut the tooth profile in the original example. However, because hobbing seems so much faster than the first technique, its not a big loss.
Also, the fact that gears works perfectly was amazing, considering that PI is 3.1416 not 3.1461. He uses the wrong value throughout the presentation.