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David - Machinist in wood
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I love that! I have wanted to cut internal gears like that for some time now but Fusion 360 doesn't have a wizard like it does for external gearing. How did you draw or lay out the teeth?

David
 

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Cool!!!!!
 
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Discussion Starter · #7 ·
I love that! I have wanted to cut internal gears like that for some time now but Fusion 360 doesn't have a wizard like it does for external gearing. How did you draw or lay out the teeth?

David
Thanks! I think you can get planetary gears out of F360 but the gear extension uses standard gearing types and won't let you create big teeth like this. At least, I haven't been able to bend it to my will. yet.

Like I say in the blog, I used Sketchup because I am pretty familiar it and was just coming up to speed on F360. If I was doing it today, I'd use F360, mainly because Sketchup has terrible CAM support. I basically searched for gear outlines, looked at an online gear generator app, read the wikipedia page and so on until I had a set of good examples. Then I drew a single 20 degree tooth by tracing an image and made it an object. From there I used Sketchup's rotate function with copy (ctl held down) using the center point as the pivot and got the planet. I had to play with the number of teeth to get it right. Then I edited the tooth object to add the connecting line (dedendum circle). Then exploded all the teeth and got the gear pattern. Repeated it for the spur gears. When I put them together it was clear everything was too tight so I had to redo the planet adding another tooth and increasing the radius to make it a little bigger but it's not hard to do. A parametric CAD program like F360 would have made it easier though.
 

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Discussion Starter · #9 ·
Thanks for the info, Phil. I missed the link in your OP the first time around but saw it tonight and read your description (well written!).

David
you're welcome. I didn't really describe how I designed the actual gears in the blog.

By the way, here's a video of it in action. Not the best I've done but it gets the point across. There is something comforting about it's clacking as you turn it.


 

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Discussion Starter · #12 · (Edited)


Had to look up that router hoping it was a CNC type because cutting those by hand, while I know is possible, is something I wouldn't consider in this lifetime. Way cool project. Thanks for sharing Phil.
No kiddin'! I was thinking through cutting them by hand. Probably the first 5 or 6 wouldn't be so bad but it would be ugly after 42. I'd probably change the shape of the gears to triangular to make it easier to cut. Thank god for my mindless little slave CBeam machine. Well, actually don't thank god because Mr CBeam is getting benched.
 

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David - Machinist in wood
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...Mr CBeam is getting benched.
So what's coming to the shop to replace it? Start a new thread if you're doing a build. Lots of photos, please! :grin:

David
 

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Discussion Starter · #14 ·
So what's coming to the shop to replace it? Start a new thread if you're doing a build. Lots of photos, please! :grin:

David
Not sure yet. I just know Mr CBeam is a little too small and I want a real spindle, not a router. Probably an Avid Pro4824 (because of space, I really want a Pro4848 but don't think it will fit). Won't buy the PnP Electronics and Spindle packages as I'm pretty capable in that area. Figure about $5K to $6K all in. About 10X what I paid for my CBeam. Not sure about the controller yet.

For a LOT less money, I could have a Workbee or similar with a slightly smaller work area but I want to be able to mill aluminum and those low end extrusion machines are slow going.
 

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David - Machinist in wood
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It's been a year or more since I looked for a way to cut internal or planetary gears in Fusion 360 so I checked the app store again today and found a few out there. I downloaded the free FM Gears and will see how it does. There are a few that are $20 so if FM Gears doesn't do what I want then $20 is a small price to pay.

David
 

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Discussion Starter · #16 ·
It's been a year or more since I looked for a way to cut internal or planetary gears in Fusion 360 so I checked the app store again today and found a few out there. I downloaded the free FM Gears and will see how it does. There are a few that are $20 so if FM Gears doesn't do what I want then $20 is a small price to pay.

David
I think it was FM gears I played with. If you figure out how to make it (or any other app) do "big" teeth, let me know. I'd love not to have to design my gears up from scratch.
 

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Discussion Starter · #20 ·
Ah, I was using metric - mode had some restrictions. Not sure how you get compatible spur gears to work with that. Will have to spend some time with it.
 
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