topic Re: Scaling this body correctly using the scale command. in Fusion Design, Validate & Document Forum

Scaling this body correctly using the scale command.

MadeByCelsius — Sat, 16 Oct 2021 19:44:59 GMT

Hello,

I was wondering how I could scale this correctly in fusion 360. I'm stuck...

X dimension is supposed to be 109.2

Y dimension is supposed to be 78.1

Z dimension is supposed to be 38.1

Not sure how to accurately do this 😞

I need it to be done in fusion 360 though.

plsmen.

Re: Scaling this body correctly using the scale command.

davebYYPCU — Sat, 16 Oct 2021 20:04:02 GMT

That can be done in Fusion.

you did not say why you cant do it.

Re: Scaling this body correctly using the scale command.

MadeByCelsius — Sat, 16 Oct 2021 20:14:43 GMT

I said I was stuck and didn't know how to accurately do it. 2 different reasons.

Re: Scaling this body correctly using the scale command.

davebYYPCU — Sat, 16 Oct 2021 21:26:11 GMT

Your body is in Meshmixer.

take a note of the actual (3) dimensions it is now. (Current size)

Load the File into Fusion.

go to Mesh area

select Modify > Scale

select Body, unselect Scale Point (important)

select Origin point for scale point.

select Non Uniform

in each (3) axis box, enter the required size / current size.

press Ok.

Might help.....

Betreff: Scaling this body correctly using the scale command.

mango.freund — Sun, 17 Oct 2021 14:05:00 GMT

109.1957 scale avev 100,00393788400092677642068323203
78.1 scale avec 100,41180410826989561543693277295
38.1 scale avec 95,603254023617265797120359729199

Betreff: Scaling this body correctly using the scale command.

MadeByCelsius — Tue, 19 Oct 2021 15:29:17 GMT

What was the method you used to acquire those numbers?

Betreff: Scaling this body correctly using the scale command.

TrippyLighting — Tue, 19 Oct 2021 15:54:10 GMT

Math 😉

Can you explain why you need this scaled ?

I am not sure I would even do this on a precise CAD model, much less an triangulated mesh model.

Do you understand the difference?

For example in the X axis the difference between the measured mesh model and your ideal nominal dimension is 0.0025 mm. What super sophisticated manufacturing method are you going to use where that makes a difference ?

You are aware that with such a precise manufacturing method you would be able to identify the individual facets of the model ?

Betreff: Scaling this body correctly using the scale command.

mango.freund — Tue, 19 Oct 2021 16:42:05 GMT

ouups: I'm very sorry for something - it was probably already late in the calculation. but now precise:
first value 39.8522 / second value 28.1 = 1.045989 1 / x because it is denied. 109.1997 / 109.2 = 0.9999606 1 / x because it is enlarged and so on.

Betreff: Scaling this body correctly using the scale command.

MadeByCelsius — Wed, 20 Oct 2021 00:27:36 GMT

Is it triangulated if I made it myself in fusion 360? or is that only for imported stl's?
I only opened the model in meshmixer to give a reference to the dimensions.

I'd upload a picture of why I need it to be precise or somewhere close but this is a grip for my mouse. it would just make sense to have the actual body scaled to the exact measurements I found online so I could have everything exact and it sit properly against the mouse without any second thought. https://i.imgur.com/SonxLcH.png

I would just export the body to cura and rescale it from there. Doesn't really make sense from a logical standpoint.

Re: Scaling this body correctly using the scale command.

MadeByCelsius — Sat, 23 Oct 2021 02:25:31 GMT

I made the object in fusion 360. what sense does it make to export the body then import it back as a mesh just to end up at square one again? but this time, I wouldn't have any of the sketches or sculpted bodies at my disposal? I'm just trying to understand dave.

My guess is that fusion 360 just isn't good at doing this type of stuff. Bummer. I could just try to keep changing it slightly until I the closest thing desirable?

Betreff: Scaling this body correctly using the scale command.

MadeByCelsius — Sat, 23 Oct 2021 02:31:13 GMT

are you sure this is correct? where did you get 109.1997 from? 28.1? I'm confused. also, I wish I could go back and edit the original post. I meant to put 81.3 instead of 78.1.

also, this: "1.0459895013" doesn't make sense. it makes the scaling go up. it needs to go down lol.
:((((

Re: Scaling this body correctly using the scale command.

davebYYPCU — Sat, 23 Oct 2021 02:32:42 GMT

(You posted a picture from Meshmixer) Not sure where the confusion is

If this model is native Fusion file, the process is the same,

required size / current size.

Fusion will do exactly what you want, when you know what you want.

Might help....

Betreff: Scaling this body correctly using the scale command.

mango.freund — Sat, 23 Oct 2021 05:31:09 GMT

when you nneed down so do it so 1/x x=(1.0458950013)

Betreff: Scaling this body correctly using the scale command.

TrippyLighting — Sat, 23 Oct 2021 10:09:24 GMT

@MadeByCelsius wrote:
Is it triangulated if I made it myself in fusion 360? or is that only for imported stl's?

Given the questions that are often asked here on the Forum I can see that a lot of people don't really know this.

No, a native Fusion 360 file is not triangulated. It is comprised of Surface bodies or BRep (solid bodies). This are mathematically precise descriptions of geometry, free of resolutions.

A (triangulated)mesh (.stl file, for example) has a finite resolution. When a CAD model is converted to a mesh model significant data is lost!

As such, exporting your CAD model to a mesh in order to scale it to correct dimensions is complete nonsense!

What you should be doing is to accurately design the model right from the start.

Can you share your native Fusion 360 model in .f3d format ?