How to Model an octagonal Bell shaped Lamp shade.

How to Model an octagonal Bell shaped Lamp shade.

henryUXZMJ
Explorer Explorer
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Message 1 of 10

How to Model an octagonal Bell shaped Lamp shade.

henryUXZMJ
Explorer
Explorer

Hello Community,

 

I'm quite new to Fusion and am having my first struggle with a Shape I want to achieve. Attached you find a picture of the Lamp and the Fusion file. I managed to construct the bell form with "circle extrusion" (sorry not native english speaker). But I dont understand how I can make the wave/ripple at the bottom.

 

Does anyone know how to come to the wanted result?

 

ps. please dont judge me for having unconstrained sketches.

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Accepted solutions (1)
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Message 2 of 10

henryUXZMJ
Explorer
Explorer

It looks like the file upload didn't work.

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Message 3 of 10

Drewpan
Advisor
Advisor
Accepted solution

Hi,

 

I would strongly recommend that you do the embedded tutorials in the Fusion Documentation and also some of the

Self-Paced Learning to help you to learn fusion faster and better. They can be found here:

Drewpan_0-1736681281496.png

 

It is also much easier for the forum to help you if you attach your file AND a screenshot of what you want to achieve

and what the problem is. You can create a file to export like this:

 

Drewpan_1-1736681281498.png

 

Time spent on the tutorials and self paced learning will not be wasted. Also check out the three RULES that are pinned to the forum for further guidance.

 

If all you want to do is cut the curves into the bottom of what you have then this is fairly easy. Create a sketch of

the curve you want on one of the planes and project the bell shape and centre line and bottom line onto it.

Drewpan_2-1736682128416.png

 

Create a three point arc the size you want the feature and close the bottom of the arc with a line.

Drewpan_3-1736682254486.png

Drewpan_4-1736682458873.png

Use the arc shape you have just created to make an extrusion cut in the bell.

Drewpan_5-1736682536547.pngDrewpan_6-1736682572184.png

Then create a circular pattern with this feature to make the curves.

 

 

Drewpan_7-1736682720806.pngDrewpan_8-1736682789683.pngDrewpan_9-1736682827587.png

 

Now you have a bell with wavy bottom.

 

Drewpan_10-1736682897449.png

 

What are your intentions with this model? Right now it will not do what I suspect that you may want to do with it.

There is only one component in this model - the Top component. There are also six individual bodies that are not

actually joined up to anything. They "look" like they are joined up but they are not. If you wanted to 3d print this,

for example, then it would fail.

 

There is also quite a lot of unnecessary things going on in the timeline. This model is using the Design in Place

method - good so far, but it is completely unnecessary to create a new plane on the face of the Wall Plate you

have started with so that you can model some more of it. You can actually start your next sketch immediately on

the face of the surface without creating the plane. Also, your Wall Plate should be a separate Component.

 

I am not sure what you have form modeled?

 

You are using simple sketches to do one or two things - excellent! However you are NOT constraining those sketches

- BAD! Constraints help define the sketch so that fusion does not have to guess what your intentions are later.

 

You only needed TWO fillets on the Wall Arm and it should be a separate Component. If you cannot see then use the

Eye Icons on the Browser tree to turn the visibility off and use the Viewcube to move around.

 

You did not need to create two bells, just a single and the Shell command would have given you what you wanted.

 

Overall your design is not bad.

 

Read the Documentation. Do the embedded tutorials. Do the Self Paced Learning. This time will NEVER be wasted.

 

Cheers

 

Andrew

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Message 4 of 10

TheCADWhisperer
Consultant
Consultant

@henryUXZMJ 

Are you willing to start over from scratch given step-by-step instructions?

I would model this using the "Sheet Metal" tools so that a pattern of the fabric can be laid out in a flat pattern.

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Message 5 of 10

henryUXZMJ
Explorer
Explorer
Hello @Drewpen.

thank you so much for your quick and elaborate response. Your guide looks like a good way to achieve the wanted result.

I definitely will do the embedded tutorials. Thank you for the hint 😉
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Message 6 of 10

henryUXZMJ
Explorer
Explorer
Hello TheCADWhisperer.

Would I need to remodel the whole design or is it fine using your instruction only for the lamp shade?

A fabric pattern would be the next step I wanted to figure out 😛
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Message 7 of 10

etfrench
Mentor
Mentor

If you want an octagonal bell, then use the Surface workspace.  Just surface extrude your bell shape.  Pattern it, but suppress all but three of the bodies.  Use the two outer bodies to split the original.  Remove (or turn the visibility off) of the unnecessary bodies. Use another sketch on the origin plane to make a cutting tool to create the scallops. Thicken the remaining body.  Pattern it.

etfrench_0-1736747582955.png

See attached file. (All of the changes are in Component1.)

 

ETFrench

EESignature

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Message 8 of 10

g-andresen
Consultant
Consultant

Hi,

here´s another way

günther

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Message 9 of 10

etfrench
Mentor
Mentor

I like using planes better than another pattern segment to cut the first segment.  This can be further simplified by using only one plane and a thin extrude to object (the plane).  Mirror this to complete the first segment.

etfrench_0-1736802196172.png

Using parameters to control the count and dimensions will make it easier to change.

ETFrench

EESignature

Message 10 of 10

g-andresen
Consultant
Consultant

Hi,


@etfrench  schrieb:

I like using planes better than another pattern segment to cut the first segment.  This can be further simplified by using only one plane and a thin extrude to object (the plane).  Mirror this to complete the first segment.

 


This is definitely a more elegant solution.
The thin extrusion option in particular can help to keep sketches clearer and make extrusions easier.

 

günther

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