The CORRECT Way to Make Herringbone/Helical Gears in Fusion 360

This video shows you the correct way to make herringbone and helical gears that have correct twist angles. Simply having the same twist angle on two gears is not enough, because the circumference difference between the two gears means that a one-degree travel is not the same linear distance.
I try to make all my KZbin tutorials as concise as possible. I get frustrated when there is not an easy solution to problems I know are simple, so I try to post my own simple solutions as I find them.
This is a re-shoot of a video that I previously made on this topic that was wrong, hence the thumbnail saying that it's under 3 minutes. I think under 6 is still pretty good, though ;)
If you like this or my other content, please consider supporting my channel on Patreon:
/ christophersfactory
Or by buying one of these sweet windmill-themed neckties:
shop.christophersfactory.com/...
CHAPTERS:
0:00 - 0:49 - Twist Angles Not Aligned
0:50 - 2:41 - Calculating Correct Twist Angles
2:42 - 4:12 - Applying Correct Twist Angles
4:13 - 5:30 - Checking for Fit and Tolerances

[@evanbarnes9984]

There are some helical gear generator plugins for Fusion that I highly recommend! They handle this for you, and can do some cool stuff like adding desired amounts of backlash, or tell you the diametral pitch of each gear to make setting them the correct distance apart nice and easy. Their main disadvantage is that none of them are parametric, which may be a deal breaker depending on what you're doing. The method you show can be parametric if the base gear profile is, so that may be a huge win!

[@partsdave8943]

Recommend the plug-in. Saves soo much time.

[@Kralasaurusx]

I definitely prefer knowing how to do it *without* the plugin, even if I end up using a plugin later to save time, because it takes the black-box mystery out of it, so I appreciate this kind of tutorial over something like "Step 1: install a plugin" I think you could put the tangent formula directly in as the expression rather than needing to use a separate calculator? I'll have to test that sometime. Still useful to see it demoed explicitly with the external calculator though And if my math is right, you could even "cheat" by parameterizing the other gear in terms of the other gear's angle by multiplying by the ratio of gear sizes, or ratio of number of teeth (but I'm new to all this gear stuff, so who knows)

[@massriver]

Interesting I'm kind of a 3d newbie. Maybe sent out 4 for printing. Those inside holes, surprise. Not so easy grind out with Dremel. One of those no one talks about guess.