Add a dome curve to a Gear Part from centre - NEWBIE

[chillydk147]

Hello, I'm not sure how to describe what I'm trying to do here, basically I have a Gear Part and need to know how or if possible is it to add a dome like curve to it, almost so that it would wrap onto a sphere surface, attached is a gear with this feature, any help would be great

[JDMather]

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@chillydk147 wrote:

... I have a Gear Part ....

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Can you attach your *.ipt file here?
How much experience with Inventor do you have (this could be easy, or it could get complicated).

[chillydk147]

Here you go, only basic expericence

[JDMather]

I don't see any dimensions?

This is going to take a lot of work (maybe a couple of weeks).

Do you have that much time?

[chillydk147]

Ok, I'll not bother if it's not possible to do within a reasonable amount of time

[JDMather]

Well, it only takes 5 minutes, but first I was going to teach you how to use Inventor.

It is important to understand the basics early on before poor modeling techniques are developed.

[chillydk147]

I'm not quite sure what you mean, I've added some dimensions to the 2D sketch, see attached

[JDMather]

This dimension does not make logical sense to me.

How did you determine this dimension?

[JDMather]

This dimension does not make logical sense to me.

How did you determine this dimension?

[chillydk147]

This is just a drawing with random dimensions, it was never meant for a real part, I only wanted to extrude the sketch and hopefully distort somehow to create the dome effect

[JDMather]

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@chillydk147 wrote:
This is just a drawing with random dimensions,....

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No.  The geometry is not random.  It is perfect.  You added random dimensions with no logic, but when I dimension (without changing the geometry) all the dimensions except for the angle make perfect logical sense.

This means that the original geometry was created in a logical technique, but at some point the dimensions were removed.

Why?  What happened to the logical dimensions used to create this geometry?

This image shows ALL of the dimensions needed to create and fully define YOUR sketch.

Did you get this sketch from someone else?

You will have trouble following my further instructions if this is your sketch, yet you do not know how you created it.

First we need to establish a strong foundation before moving on to more complex features.

[JDMather]

Once the foundation techniques are mastered - the part might be very easy.

Are you going to 3D print this?

Do you want the gears to move?

[chillydk147]

Sorry I think I'm been misunderstood here, this will never be 3D printed etc, this is purely an exercise to produce a Graphic which will have a logo decal on the Gear Face, I know the dimensions may not make sense but they don't have to, they only have to be a rough size in order to achieve the look I want, so I'm eager to know how you did what's shown in your last post. 🙂

[JDMather]

Can you answer this question -

exactly who created the sketch - the dimensions do make sense.  On the other hand the dimensions you added do not make sense.

Did you delete dimensions from the original sketch? (somebody did)  If so, why?

In order to make this logo - you will have to understand dimensioning.  Whoever created the original sketch did understand dimensioning as that person used perfect dimensions (except for the angle, but that can be overlooked).  It is apparent from your attempt at dimensioning that you do not fully understand dimensioning.

[chillydk147]

I created the sketch, starting with a 50mm diameter circle, then I added a random gear tooth shape and repeated it around the circle, I've created another part, a simpler design and with all the important dimensions included, see attached

[Rory_M · Accepted solution]

Is this what you're looking for? See attached file.

The gear profile I've created is pretty basic and just for the purposes of this explanation so the dims may not be too logical.

The part contains 2 relatively simple features that should get you the shape you are after.

One loft to a point to create the basic gear shape with angled sides and then the revolve (intersect) which makes it domed.

Hope this is useful. It's in 2015 format by the way.

Rory

[chillydk147]

Thanks this really helped me understand how to construct what I need.