Compound curve around an axis

[Anonymous]

Hi Guys,

I need help with reverse engineering a part. As you can see this is part of a clothes line and is cast in Aluminium. I have done a rotation and have included all draft angles required to casting. I am now trying to come up with a way to do the top "crown" section. This is not as easy as i initially thought it would be. It cannot be extruded as it's derived from the axis. I was considering trying to draw on the face of the part and lofting it to the axis. Is this possible? Any other ideas?

Thanks.

[SBix26]

Looks as if a curve wrapped to the face would be useful, then split face, or sweep cut, or ruled surface to produce the finished profile.  If that doesn't make sense, post your file here (zip no longer needed!) and tell us what version of Inventor you're using.

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Sam B
Inventor Pro 2020.2 | Windows 7 SP1
LinkedIn

[Xun.Zhang]

Hello @Anonymous,

There are many ways to do so.

Below is a relative simple one for your reference and check out more details from enclosed file.

Hope it helps!

[JDMather]

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@Xun.Zhang wrote:

Hello @Anonymous,

There are many ways to do so.

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Unfortunately this isn’t one of them.

@Anonymous 

Attach your attempt here.

[Xun.Zhang]

Hi @JDMather,

How about two projected curves inside and outside, make a surface and then work with surface cut or face replacement?

Is it better?

[Anonymous]

Hi @JDMather,

Have a look at the part I have attached. I am using Inventor 2020.

As best as I can ascertain the tops and bottoms of the "crown" have a radius of 14mm.

All faces are parallel to the bottom face and seem to be centred around the axis.

Thanks mate.

[JDMather]

Your Sketch1 is not fully defined - which indicates to me that this is going to take more detailed instruction than I have time for at the moment.

Of the 3 ways that I know to solve this geometry problem - they all require knowledge of the Follower (cutter) radius (or diameter).  Do you have an image of the mating part?

[andrewdroth · Accepted solution]

I think you could get close by using a coil to make a splitting surface like this. You'd just need to adjust the transition angles to get the shape right.

[johnsonshiue]

Hi! The most precise way to create the cut is to use Solid Sweep Cut. A close approximation is to use wrapped curve and spit the face. Then thicken/cut.

Many thanks!

[Anonymous]

Hi @andrewdroth,

That worked a treat. i brought two of the same parts into an assembly and they meshed perfectly.

Love you work mate.

Thanks.