Bevel Gears In Fusion 360

[@petemcgee]

Andy I have no idea how I've gotten to your tutorial for my Robotics class, but my god is it well laid out. Thanks mate, this was super informative and interesting!

[@quakfrosch2298]

You are AMAZING man, thank you SO MUCH for this.

[@urischulgasser4758]

GF Gear Generator does not seem to let you change the contact angle, which is frustrating for an otherwise great tool... your method, while requiring some outside math, does let you pick any angle!! Have you yet an update that works in Fusion? (I don't have Python for that calculation you listed...)

[@steveh8724]

Thanks very much for this clear, step-by-step tutorial! Does using the loft between the scaled sketches compromise the closeness of the tooth profiles to the desired involute curve? If not, then this is one of the best methods of modeling in F360 that I've been able to find!

[@AndyThirtover]

I have a couple of gears on my desk that I twiddle with during conference calls - I'm always amazed that I cannot feel any backlash. These were printed on a Prusa SL-1.

[@Lucas_sGarage]

Very simple method, thx

[@sjb1604]

What are the variables you used in your script please? I'm trying to create 90° bevel gears. 48 is the pitch from the spur gear add-in. 22.5 is the angle between the gears and 20 is the gear thickness?

[@AndyThirtover]

import math rads = math.pi/180 gear_thickness = 20 gear_angle = 45/2 teeth = 48 scale_factor =(teeth - (gear_thickness*math.sin(gear_angle*rads)))/teeth print("Scale Factor: {}".format(scale_factor)) This is a little Python program that will sort it out. In your case gear_angle = 90/2 (because you make 2x45 turns). Regards Andy

[@sjb1604]

Andy, thanks for the explanation. Your video is by far the easiest method to make working bevel gears. I printed your example and they worked well! Thanks

[@FlyHIGHSIM]

@@AndyThirtover does this woks for 90° bevel gear and pinion?

[@AndyThirtover]

@@FlyHIGHSIM Yes this works for 90 (2x45). These days there are very good gear builders. I'm using CF Gear generator these days.

[@FlyHIGHSIM]

@@AndyThirtover oh god... i didnt even know it exists... thx :) i'll get this generator :)

[@kevorkarackellian389]

Not sure if it is the new user interface but the geometry that I am trying to replicate is very different from the one you show. Can you please verify that your method still works with the updated Fusion 360. Thank you!

[@AndyThirtover]

I can confirm that addins are still available - but now under the tools menu in design. The 'Project' function seems to have disappeared. I used a mirror face this morning, this is not as good as project. You can also select all the of lines that make up the face of the spur gear - but this takes a little time!

[@AndyThirtover]

OK, so you can use all the edge selection to get all the lines of the gear face and then copy these to another drawing - from there you are good to go!

[@kevorkarackellian389]

@@AndyThirtover Yes, I stumbled on this last night as I was desperately trying to find a way around the missing projection function. This is a great way of creating bevel gears. Thank you!!!

[@kevorkarackellian389]

One additional note that may help someone. When scaling the offset sketch all dimensions will be adjusted! I was playing with a 48 tooth, 50 mm thick, 90 degree gear. The scale factor of 0.26343 changed the thickness of my gear proportionally to 13.17 mm. To get the gear back to the desired thickness of 50 mm I had to click on point in the offset plane above the origin. All else is as Mr Harris describes in his video.

[@mroek]

This method doesn't create gears that mesh correctly. Lofting between to flat spur gear profiles will not create a proper bevel gear. You will get away with it when the angles are way less than 90 degrees (like in the video), but if you try this exact method to create 90 degree bevel gears, you will see that they aren't even close to meshing properly. This post at the Fusion forums explains exactly why: forums.autodesk.com/t5/fusion-360-design-validate/how-do-i-create-a-bevel-gear-like-this-in-fusion/m-p/6955483/highlight/true#M103817

[@steelstone]

Indeed. A bevel gear should be designed as a pair of touching cones on their slant height. Their intersection results in a line. The profile of one tooth of each gear cone should be perpendicular to that line.

[@keera2610]

Thanks su usful