Help... the best way to Construct a Worm Gear

[Anonymous]

I would like to 3d print a Worm Gear for small stepper motor, Where I need mor tork.

What would be the right/best way to do it in Fusion ? 

It doesn't have to be a spur gear, Straight tooth gear would be a Fantastic start

I have seen the video

https://www.youtube.com/watch?v=khG4Zk5XZrw

Is it possible to make a offset revold of the "Rack" ? and how...

[taylor.stein]

Hi Harvid,

From my experience, this is a bit tricky in Fusion 360. That being said, you might be able to model the teeth of the worm gear with the following steps:

• Create a Cylinder
• Choose Coil to remove geometry from the existing cylinder (with a square or triangular profile). 

I'm not 100% sure that this will give you the exact profile you need, but it might make a passable 3D print. If not, I would recommend finding an existing worm gear from an online resource, such as GrabCAD, uploading it into Fusion 360, and then modifyingn the geometry to match your stepper motor. 

Hope that helps!

Taylor

[Aaron.Magnin]

Hey there...

Here are some other ideas. 

You can try the following Helix Generator one of our team members made. I havn't tested this, but I know and use other add-ins that Patrick has made:

https://github.com/tapnair/HelixGenerator

The other approach is similar to Taylors in approach, but slightly different.

1. make a cylinder

2. add thread

3. convert the thread edge to sketch 

Then you have a helix to use for either a swept cut or a to add the threads to a cylinder.  

See example here, although I was trying to make a tapered helix in this case....

http://a360.co/1tuAfvb 

Aaron

[Anonymous]

I really can't see any reason for why i cant make this sweep...

Is it Fawlty curves or Fawlty tool ?

I have even make a small offset of the curves so the didn't touch each other...

http://a360.co/1Yqn61D

[Aaron.Magnin]

I think its because the cut ends directly on the face. Try to extend the gear profile slightly. 

[Rdstngry]

If you don't have time to draw one yourself, or are just too lazy. Pick out one that will work for your application, on MC Master Carr's website, then use the Insert McMaster-Carr Component feature on the Insert tab. This is also extremely helpful, when you are a "CAD Newbie" like me.

[Beyondforce]

Hi @Anonymous,

Are you looking for something like this?

Cheers / Ben
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[HughesTooling]

@Beyondforce The forms are not as simple as that. The worm is probably a 20° a side rack form cut around a helix. The form in the gear is probably an involute form cut using the same helix as the worm.

Mark

[Beyondforce]

Yes I know it's not that simple. I just need to know exactly what type (shape) of a gear and a worm. There are many of them out there.

[Beyondforce]

How about this one?

Cheers / Ben
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[JDMather]

If you can give me your specifications - I can model it for you in seconds.  

[HughesTooling]

@Beyondforce Looks pretty good. Have you used the involute form from a spur gear to cut your gear?

Mark

[Beyondforce]

No I did not. I have used a different technique. If @Anonymous like that, then I'll make a video.

[Anonymous]

very nice!

[Anonymous]

Beyondforce Did you model the gears in Fusion ?

JDMather Which software Is the screen dump made from ?

[Beyondforce]

Yes I did. You can do everything in Fusion 😉
He is using Inventor 🙂

[Anonymous]

@Beyondforce

It could be really interesting to see how you did it 🙂

[Beyondforce]

@Anonymous,
If you don't mind waiting, I'll do the video tomorrow and I will add it to my YouTube channel. The quality will be much better than the screencast.

I will send you a link when it's ready.

Ben.

[Anonymous]

@Beyondforce

I'm not in a hurry, looking forward to see the video 😄

[Beyondforce]

@Anonymous,

Here you go:

http://forums.autodesk.com/t5/post-your-tips-and-tutorials/tutorial-how-to-create-a-worm-gear/td-p/6...

Ben.