Having issues making solid from sketch

[snaven655]

I am a newbie to Fusion 360.  I am attempting recreate a part I need to 3d print..  I have a good portion of it sketched.  I have spent days messing with the contraints to try to extrude from the sketch without success.   What am I doing wrong?  file is attached.

[snaven655]

Sketch.ShowUnderconstrained

Under constrained points: 6, under constrained curves: 0 

It does not show me where they are...

[g-andresen · Accepted solution]

Hi,

The profile for the extrusion was in a 3 d sketch and was probably destroyed.
I removed the 3D elements in sketch 1, unlocked the sketch and lifted all elements to the 2D plane.
The sketch must now be dimensioned and completed with further conditions.

günther

[snaven655]

Thank you!

[Drewpan · Accepted solution]

Hi,

Look carefully at the results of Sketch.ShowUnderconstrained as it does show you where they are, you need to see

them.

Since you have points that are unconstrained those points will be open circles instead of black circles. Often you just

need a dimension or a coincident constraint to lock them down.

Cheers

Andrew

[Drewpan · Accepted solution]

Hi,

Can I make a suggestion about your modelling. Sketches should not be overly complex they should really map out the

basics so that you can use the modelling tools to craft the final shape. An example of this might be to create a bar with

rounded ends. I can sketch this quite easily, I can work out the radius of the ends and I can constrain and then simply

extrude the finished shape. Another way and arguably better way would be to simply sketch the bar outline, extrude it

then use the fillet command to get the ends rounded. You end up with the same result but the workflow is different.

Why would you do it this way?

Fusion is modelling software where you create the model first and the paperwork later from the finished model. Using

sketches to craft complex shapes  is more like drafting where you work out the hard stuff first then model it. Many of

the Gurus on this forum will use many less complex sketches to craft a final part because complex sketches can be

easy to break and broken and unconstrained sketches are often the root cause of problems down the track.

By simply fully defining my sketch and then trimming the bits I "don't need" in this simple example, I have broken the

sketch. I now need to go back and fully constrain it which happens often when trying to get my sketch just right. But

what if instead I modify my sketch with the tools instead?

Similar shape, but now when I extrude I will use the tools.

This is less work because I don't break my sketch and re-constrain. I am still using the knowledge I have on what my

shape will look like but when I go to create my engineering drawings, instead of basically copying the sketch, which

is double working, I use measurements directly off my model. My model is the final shape of the part, where as my

sketches could be quite basic.

Cheers

Andrew

[snaven655]

Thank you for you knowledge and schooling!