[titantomorrow]

Hi all, I though I might try my hand at developing a fusion 360 script. It generates spur gears with a round root fillet (ellipse) to make machining easy (no corners to cut).



Graham

[titantomorrow]

Opps, this shows it better

[InMesh]

There are a number of free gear generators out there easy to use .

[titantomorrow]

Yep absolutely (like Gear Generator), I couldn't find one that generated the curved fillets though.

Still I know what you are saying - why re-invent the wheel? I guess the about box in geargenerator.com says it all. I'm building something fusion 360 and needed it.

Interestingly enough, I read one article at suggested curved fillets make the gear stronger because the corner created a stress point.

[RCaffin]

I don't know what that is meant to mesh with, but the teeth look a bit too big & fat to me.
Have you tried printing that gear and its mate out on paper, cutting them out, and testing the mesh?

Cheers
Roger

[titantomorrow]

Attachment 304500

Hi Roger, just printed them out and ran them off a cordless drill at 1500 rpm. They work ok. The modulus is really high - 9mm.

[titantomorrow]

The root circle is too small, I'll need to work on that.

[RCaffin]

> The root circle is too small, I'll need to work on that.
Yes, that's what I was thinking. Looks wrong.
Have you looked at Gearotica?

Cheers
Roger

[titantomorrow]

Yeah it looks great.

[titantomorrow]

The undercut has been fixed by profiling the undercut.

I want to prototype my design with some thin laser cut gears and add the cross for supporting lego, so I created a 2D laser cut version (the difference is that it adds a bit for the laser cut kerf).

It is sure an interesting learning exercise. They make great spinning tops.

It has been an interesting exercise in getting a script published in Autodesk. They (rightly) want a professional icon and a professional name. It is really interesting how we are going from expensive professional tools to the pricing model of Fusion 360. Brave new world.

[RCaffin]

Rather a curious profile.
Have you tried to do an FEA on the teeth? (Can Fusion do this?)


Cheers
Roger

[titantomorrow]

Hi Roger.

If FEA means finite element analysis, hmmm.

Fusion 360 seems to have support for simulation etc, but I have never looked into it.

What I am doing just has an end goal of creating gears out of pine (Douglas Fir) for an low power electronics project.

Graham

[titantomorrow]

My progress so far (3d printed, cnc routed and laser cut). The printed and cnc is using the undercut profile for the fillet (plus clearance), the laser one is not. I actually made a holder for the cnc version so I can cut one side, turn it over and cut the other. Challenge to get it out though.