Unable to create rectangle on extruded part

[Anonymous]

I'm a first time CAD learner and am going through some tutorials.  
I've successfully created a 3D rectangle and have used parameters for dimensions.  

I am now trying to create a rectangular cut-out on that rectangular extruded shape.  

On the sketch tab, I select 'rectangle' and then go to draw on the face of the extruded shape i'd like to make a cut-out. no matter where I click on the edge of the face i've selected, the 'x' for selection doesn't appear ... except on the 'bottom' edge of the face i've selected.  After clicking the first corner, I also can't set dimensions/ 'Specify size of rectangle' ... the 'x' doesn't appear again and dragging the mouse around on the face of the extruded rectangle doesn't "do" anything.  

If I instead try to create a 'line' ... I can only do so along the same axis as the 'bottom' edge of the face i've selected.  I can't create that line "on" the face i've selected or along an edge higher up than that ...  

What am I doing wrong? Clearly I'm missing something fundamental here.

I'm on a Mac if that matters, using 

2.0.8816
Active Plan: Fusion 360, Personal
macOS 10.15.6

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

And include link to the Tutorial that you are attempting to follow.

(I doubt you selected the correct tool for your first Extrude as you did a Surface Extrude rather than a Solid Extrude.)

[Anonymous]

this is the tutorial: 

https://www.youtube.com/watch?v=nJLVbv0uuOQ&feature=youtu.be

[TheCADWhisperer]

Unfortunately the Tutorial you are watching was done in an older release - so some things will be different in the current release.

[Anonymous]

ok ... but does that mean that I can't create a cut-out on an already-extruded-part?

[TheCADWhisperer]

I inadvertently put wrong image in previous reply - check it again.

[demong · Accepted solution]

Hi @Anonymous ,

From your screenshot, it appears you've selected the bottom face for your sketch. That being said, this is the reason you can only make sketch features on the bottom face, and you can't see the features you are trying to sketch because you are looking perpendicular to the sketch plane. With typical settings, you should see a grid when looking at your sketch. (See my screenshots.) Selecting an unintended sketch plane isn't uncommon. I would recommend that before you select the sketch command, try to take a moment to ensure you don't have any faces/planes selected so you can choose you plane after, or be careful to ensure you've selected your intended plane before you hit the sketch command.

If I'm correct, you should be able to correct your current problem by creating a new sketch and being careful to select the proper face. I hope this helps!

[Anonymous]

ok! yes! thank you.  

it does look like i'm looking at the wrong face ... how do I change which face i've selected?

edit:

Nevermind!  I figured it out.  Thank you for the help!

[g-andresen]

Hi,

The main difference is that unlike the tutorial you work in surface  mode instead of solid mode.

Screencast Solid vs. Surface

günther

[demong]

Glad you got it sorted! In case you did it a different way, you can always right click on the feature in the timeline at the bottom and edit the face with "Redefine Sketch Plane", but keep in mind that if you have a complicated sketch with projections, Fusion will simply lock the projections in whatever new orientation it sees fit. Good luck!