Modify Drawer STL

[3D_Ken]

I have an STL file of a drawer that I need to modify to make the drawer deeper while keeping the top part unchanged.  It is my understanding that the first step is to import the STL as a mesh.  I have done this, but I don't know what the next step is.  My only thought is converting the mesh into a body, slicing the body in two, separating the two sections and finding a way to fill in the space.  Is this what I should do, or is there a better way?

STL and F3D attached.

[TheCADWhisperer]

@3D_Ken 

I see blue lines and a white dot - these should keep you awake at night.

Click and drag the indicated points.

What do you observe?

OK, I see you have posted an updated file.

I will work on the next set of steps...

For the angles I simply sketched them relative to the imported geometry visually and then added logical dimensions.

[3D_Ken]

Already fixed in V5 an hour ago.

[3D_Ken]

"I will work on the next set of steps..."

I think there is a bunch of stuff (not all) that I can do on my own.  The only thing I'm not sure of is the handle.

Should I give it a try?

[TheCADWhisperer]

@3D_Ken 

I am going to be tied up for a bit.  Give it a try on your own. 

JD

[TheCADWhisperer]

@3D_Ken 

Hints: 

Sketch top view.

Extrude

Extrude Intersect

Extrude Intersect

Shell

[3D_Ken]

I'm afraid that I've gone as far as I can, and I'm in over my head.  Attached is my latest file.  It has everything but the handle parts.

I've sketched the top view, but don't know where to go from here.

[TheCADWhisperer]

@3D_Ken 

You are doing wayyy too much work.

Sketch2 should look like this and nothing more...

[3D_Ken]

I got things back the way they were (matching your diagram).  However, I don't understand what is wrong with my Sketch-4, or how to make it right.  Fusion keeps telling me to "re-select reference geometry", but "redefine sketch plane" doesn't fix it.

Current design attached.

[TheCADWhisperer]

@3D_Ken 

Your Sketch4 was created on existing Extrusion that you deleted.  We (almost) never ever create a sketch on anything except the Origin Planes (at least as a beginner).

Delete Sketch4 anyhow - it is not what we want.

[TheCADWhisperer]

@3D_Ken 

Your 3rd sketch should be on the XY Plane and look something like this...

Keep your sketches simple.

Edit: Oh wait a minute, I see a huge number of Symmetry Constraints in your Sketch2.  I never instructed that?  Did you use Mirror?

OK, I went back through my instructions.  I don't see where I said use Mirror or Symmetry?  I do see where I said use Equal (=) Constraint.

[3D_Ken]

"I don't see where I said use Mirror or Symmetry? "

I did use mirror, it seemed easier.  Should I go back and change it?

[3D_Ken]

Here is my progress file.  I can remove the mirror if you want me to.

[TheCADWhisperer]

---

@3D_Ken wrote:

"I don't see where I said use Mirror or Symmetry? "

I did use mirror, it seemed easier.  Should I go back and change it?

---

Mirror is computationally expensive (read slow), on this simple geometry it might not matter but best to get out of this habit now.

We will use only the most robust modeling techniques.

Remove the Mirror and use Equal instead.

[TheCADWhisperer]

@3D_Ken

You have unnecessary dimensions (I might let the function dimensions slide, but) use Project points from the earlier sketches and Coincident Constraints rather than duplicating dimensions.

You will like the next couple of steps once we get these three simple sketches defined.

[3D_Ken]

I put the dimensions in to get the lines to turn black.  If I take them out, they turn blue again.

File attached.

[TheCADWhisperer]

@3D_Ken 

The pro technique is to use Project (geometry) and Coincident constraints instead of repeating dimensions.

[3D_Ken]

I projected the rectangle dimensions, but I can't figure out how to get rid of the 22.57 mm and the 35.3 degree dimensions without creating blue lines.

[3D_Ken]

I projected the rectangle so I was able to get rid of those dimensions, but I can't figure out how to get rid of the 22.57 mm and 35.3 degree dimensions without creating blue lines.

[TheCADWhisperer]

@3D_Ken 

For the angled lines delete the dimension and make them Equal (=).

For the distance Project this point down from Sketch1 and then set a Coincident Constraint between the projected point and the line.

Of course, delete that 22.57 dimension before attempting to add the Coincident.

[3D_Ken]

I tried doing what you said, and just can't get rid of the blue lines.  File attached.