Fusion 360 Tutorial for Absolute Beginners: Introduction (2020)

[Anonymous]

https://www.youtube.com/watch?v=S6OUkn2Cksg&t=1s

Introducing Autodesk 360! In this beginner lesson tutorial, we will learn the basics of creating 1D lines, which create 2D shapes and eventually 3D parts. We will explore the sketch tool, rectangle and extrusion tools, then the revolve tool to create 3D parts.

[TrippyLighting]

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@Anonymous wrote:

... we will learn the basics of creating 1D lines ...

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A line already is a 2-dimensional object 😉

[TrippyLighting]

@TrippyLighting Dude, what have you been smoking? Did you forget to take your medicine? Again?

Not wanting to get into an argument here, but do some research before you post!

[whittakerdw]

As @TrippyLighting said lines are already 2D objects whether they are connected or not. Once connected and extruded, then they become a 3D object.

[whittakerdw]

@TrippyLighting  are you arguing with yourself?

[TrippyLighting]

I usually only yell at my computer and most of the time there is no argument and I quite agree with myself. 

In this case, I don't, and hopefully, HE isn't going to put up a fight. We'll see 😉 

[whittakerdw]

Correct me if I am wrong, but a line would have to have 2 dimensions a length and a width. The length, of course, being however long the line is. The second dimension being the width, the thickness of the line. You can't have a 2" line without have a thickness for the line, whether it be .005" or what have you. There has to be that second dimension. When it becomes 3 dimensions, you have length, width, and height or length, width, and depth. However you look at it.

[dankG2KYJ]

@whittakerdw 

"You can't have a 2" line without have a thickness for the line, whether it be .005" or what have you. There has to be that second dimension."

If you're defining the width of the line you are making a 2x.005" square (albeit small), therefore like you said 2-dimensional 😉 

[whittakerdw]

That sounds good enough to me!

[TheCADWhisperer]

Does a line have two endpoints or does a line have only one endpoint?

What is/are the (X,Y,Z) coordinate(s) of a line?

What is the general formula for a line?

A circle?

[dankG2KYJ]

@TheCADWhisperer 

A line has infinite length but can be embedded in higher dimensions, for instance, you can define a line in a two-dimensional space (X,Y) which gives it one dimension (the length between the points). There is no Z dimension as it has no thickness. 

I think we are all pretty familiar with planes, and you can prove it to yourself in Fusion. Take a line, try to extrude it. Or, work backward from a plane that is two dimensional with zero thickness. Now split a body with a plane, is there a gap that is the "thickness" or Z-coordinate of the plane? Nope. Now apply that zero thickness of a plane to zero width of a line which is why you cant extrude it. 

[TheCADWhisperer]

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@dankG2KYJ wrote:

1. There is no Z dimension as it has no thickness. 

2. Now apply that zero thickness of a plane to zero width of a line which is why you cant extrude it. 

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1.  What if I have a line that has an endpoint on the XZ or YZ plane, does it still have no Z dimension.

2. What???

[TrippyLighting]

When a line is described in a context of cartesian coordinates, the location of the end point is described by  3 dimensions. However, we all know that a point is infinitesimally small and does not have any dimension.

By the same token, a location and orientation of a line in a cartesian coordinate system might be described by 2 points, but the line still only has one dimension.  

Wikipedia and Wolfram Mathworld agree.

Edit:

A better explanation is that the order of a dimension is described by the degrees of freedom one has when moving in that dimension. On a line, one can only move in one direction, so it only is one-dimensional.

[dankG2KYJ]

1. I was describing a line in terms of cartesian coordinates as @TrippyLighting mentioned.

2. This is just terrible English on my part 🙂 Trippy's post should clear that up. 

[Anonymous]

You are totally right! I made an error there. No reason to get personal, though. That isn't very nice.

[TrippyLighting]

@Anonymous 

1. No you did not make a mistake. A line is one-dimensional.

2. I was not arguing with you. I was arguing with my second self. That dude really needs to get his act together 😉

Also, that guy is stinking lazy, I end up having to do all the work 😕

Going to have a chat with him now! Hey Bro ... (to be continued)

[Anonymous]

It was confusing, because a straight line is one dimensional. So I don't get what the mistake you are referring to is...

[Anonymous]

A single straight line is 1 dimensional. I have one guy yelling at me telling me lines are two dimensional and that I "didn't take my meds" and another somehow agreeing... I see posting here was a waste of time for all of us.

[TrippyLighting]

@Anonymous you are taking my posts way too seriously 😉

No one's intention here is to yell at you. Making a beginner tutorial is a lot of work and is appreciated!

In my first reply, I incorrectly pointed out that a line is not one-dimensional and then thought about it ...

I decided to not take this too seriously and start arguing with myself ... not you.

[Anonymous]

Okay, no problem. It's a misunderstanding.