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Wrap a feature around a profile

sgavin
Newbie

Wrap a feature around a profile

Hi guy's,

I'm trying to find a way to wrap a standard gear rack (datum curve) around an oval profile so I can extrude it down to form an oval gear.

Is this possible?


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13 REPLIES 13

Re: Wrap a feature around a profile

If I understand right, yes, you can wrap a curve onto a solid or surface.

Re: Wrap a feature around a profile

Promising!

How?

I can wrap a 2d sketch no problem. It's trying to wrap a sketch that is normal to the surface.

Thanks

Re: Wrap a feature around a profile

wrap.jpg

Just a simple test piece.

Re: Wrap a feature around a profile

How about patterning along a curve?

Re: Wrap a feature around a profile

Thanks, I'll have a play with that.

Re: Wrap a feature around a profile

Do you mean an oval gear like in a Spirograph?  If that's what I'm thinking, that would be different than wrapping a curve.

Re: Wrap a feature around a profile

ovalgearassemblyrev3.jpg

looks simple, but there's a trick in creating the pitch diameter (oval) which I'm fine with creating. I'm looking for a less painful way of applying the gear tooth detail.

Its oval (elliptical) like but not exactly so wrapping a rack over the profile may be a viable option.

Re: Wrap a feature around a profile

I wonder if a spinal bend would work where the spine is equal to the oval pitch diameter.  The roots of the teeth would be compressed and the tips expanded.  Not sure if that would be a wash when you run two of these gears together or the profiles end up too warped.

Re: Wrap a feature around a profile

Thanks. The deformation is what I'm after.

I'm having some joy with Quilt flattening and then quilt deformation. It actually wraps the solid created on the flat quilt back around the profile. A little temperamental but it works on a simplified model.

Re: Wrap a feature around a profile

You might see what happens with spinal bend.

Theoretically, you could wrap a gear tooth rack and use spinal bend to wrap the flat gear bar around the cam shape you want.

I would suggest the bend profile to be the pitch profile of the "cam"..

Re: Wrap a feature around a profile

I'd suggest spinal bend as well, except the concern, as Andrew stated would be the distortion.  If it was just for show, it'd work just fine.  If it was supposed to be accurate, not so much.  As you guys both mentioned, I'd also agree that the pitch diameter would be the best thing to use.

I wish I had some time to work on this, as I have a method I've been playing with to easily create gear teeth without using CS's and complicated equations, that would really lend itself to this....

Re: Wrap a feature around a profile

This is kind of late but do hope it does some help.

gear.JPG

Re: Wrap a feature around a profile

Its never too late!

Thank you. I will check this out.

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