Help! How do you create a cone in fusion 360?
Revolve the Rectangles about their centerlines.
(These are actually your "holes" in your original design. We will see how to use these going forward.)
Note that we did not use Move command, we can control the size and location with Dimensions.
Q1. Why did you create these disks in your original design?
Q2. What is the picture that you posted earlier? Looks like an art installation that I don't recognize. It might help if I had more information about the Design Intent.
Which axis should I use for the tilted ring?
For some reason I can't revolve the second largest ring, like I can with the largest right next to it. I suppose it has to do with me not being able to select centerline on the 10mm edge:
I will stop here and ask you to troubleshoot my drawing:
Okay, I got it, after attempting to revolve a few more times.
Hi,
Good guess. I didn't want to bother you with the details just yet.
Ideally the speaker would be straight, since this type of speaker sort of throws the sound and at one very narrow spot you get the desired frequency response. Outside of this zone - not so much. This is why you want to aim it at your sofa, or get a lot of them and point them at your crowd. Ultimately they proved to heavy for roadies to carry between concerts, and were replaced by lighter alternatives that uses more power and have more distortion.
Here it is in all its glory when straight:
Now the trick is to bend it 90 degrees, so it can fit in my livingroom.
Ideally the centerline of the biggest opening should be at 100-130cm height. The box is about 12-15cm as well.
Most people end up putting it at the floor to use the added floor bounce, which strengthens lower midbass, but they forget you would have to also sit on the floor to listen to it.
These are all just improvised 3D renderings, not even that symmetrical. Just to see what it might look like.
Someone even built a bigger one with Japanese drivers: https://youtu.be/sFadkxRH3Hw?si=cAVtO0mYM11x4X_L
THE 90 DEGREE BEND:
If I were to get it at the correct height, I think I would need to make it a little shorter and change the total length to 1672mm. A good place to start the bend is from zero length to 700mm. The bend can stop at the point almong the curved line from length zero to 1400mm, i.e. 272mm from the biggest diameter, along the centerline.
The box below housing the four speaker drivers has a height of 150mm.
Back to my old technique. Sry!
See if you can make sense of these numbers. In this list you can see the radius at every 10cm intervall along the length. The column for angle is only accurate for the straight parts of the model, not the adapter and not the 90 degree bend.
I would like it to be straight from length zero to length 700mm.
Then a slow 90 degree bend from length 700mm to length 1400mm.
And straight from length 1400 to length 1672 mm, where the diameter is the biggest.
The adapter starts from length zero to length 300mm.
The area at length zero where also the 4-way split adapter starts, is 309cm2. When dividing the area atnlength zero - 309cm2/4=77.25cm2. The diameter of 77.25cm2 is 9.93cm and can be seen in the first sketch. It expands until it reaches length 300mm where the area is not divided anymore and is 361cm2. It seems difficult and tedious to calculate this expansion inside the adapter because the shape gradually changes from circular at length 0 to quarter of a circle at length 300mm. Perhaps the easiest way is to take some samples of the area in the middle of the adapter to check that the area is not completely off from the list of data.
One thing to look out for is at length 300mm the cross-shaped flanges inside the adapter tends to become super skinny, and since this speaker will handle bass, thin walls is not optimal and should be thickened a bit more.
I am looking forward to it. 🙂 I am very excited to solve this riddle on how to make a proper 3D model of this project!
In the video I linked it seemed he prefered the Form Bodies method over the Revolve method, because it would have taken 20-something profiles to use revolve for the model he was working on.
If this is true and you indeed need more resolution, here is the cone with 5mm intervalls:
@joni_lundberg wrote:...because it would have taken 20-something profiles to use revolve for the model he was working on.
...If this is true and you indeed need more resolution, here is the cone with 5mm intervalls:
It is a common misconception that more is better when dealing with resolution of spline curves.
You can use more points as visual reference, don't use to define the spline curve. Visually best fit with as few points as possible (preferably only 2, but you would need more for this curve). Certainly not 5mm intervals (other than for visual reference). You want the software to generate the curve.
In the video I forgot to mention that after visually getting the handle manipulation you should then dimension the handles angles and the weights. (The weight dimension will show mm length dimension - but this is a misnomer. It is not a length, but rather a weight of influence on the curve. If you are curious you can verify this be sketching a line of known length, say 100mm, and compare to a handle weight of 100 (mm).
Thank you, I will try this.
I find it difficult to measure the distance inside the inside wall of a smooth cone, and with this method I would need to be an expert at it, in order to know if I am still following my list of length and diameters - with some compromises at the bend. I could MOVE cylinders in place and measure between their centers, but you told me not to. 😛
I was hoping there was a way to create the cone like vertebraes (flat cylinders) on a spine (i.e. straight line) and then bend that spine in only one plane (i.e. point spline), and all the vertebraes with different sizes follow nicely and keep their distance to the centerline like they were before when the spine was straight, still atteched to the spine. Then I would not need to measure anything.
I could just keep the first lengths from 0-700mm pointing straight up, flip the last lengths from 1400-1620mm 90 degrees, and then bend the middel at length 700-1400 at an appropriate bend that make the sound, with an estimated guess, reflect out of the horn and not reflect it back in.
This is what I can do in 10 min in MS Paint by adding the 10cm lengths together:
I am sure Fusion 360 can do it better than MS paint. 🙂
Notice how the first part and the last part is straight and symmetrical.
This would make a good excellent Canvas reference image in Fusion if it does in fact match your Design Intent.
We could cover that topic next.
My biggest concern is if I can't properly measure the lengths and diameters in the bend to make it match my list, the cone could actually end up like this when I meaure it and pretend to straighten it out again:
