Fix/Unfix & "WARNING: dimension/constraint has been lost or deleted..."

[aviatorblc]

Newby, unsure whether I'm posting to the correct board...

If you select the elements of the sketch that will not be further modified, fix them, and then create the additional elements that interface with the previously mentioned elements, does trimming actually result in a risk of any elements moving or not being machined/cut/whatever correctly? (See Screen Shot attached.)

IOW, I fix the [steering wheel] spoke sides immediately after sketching them, I fix the outer rim immediately, then draw the inner rim, and finally the spoke-to-inner rim transition circles.

When I trim away the unwanted lines/arcs, I get the warning regarding lost dimensions/constraints.

What am I missing here? Thanks in advance for your thoughts.

[jhackney1972 · Accepted solution]

I would use sketch constrains, not Fix, to constrain your sketch along with size dimensions.  After that, trimming may produce a working about sketch constrains being eliminated or modified but as long as the sketch is fully constrained you can ignore them.  Attach your model and the Forum users can demo the process.  If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.

[aviatorblc]

John, thanks for responding. I'm attaching an .f3d file in the hopes that you'll understand what I'm struggling with.

I'm also attaching a tracing of our original Bugatti steering wheel, in the hope that you can coach me a bit on placing the finger grip indents on the inner rim of the wheel.  Am I wearing out my welcome?

There are 7 finger grips per quadrant, and I'm hoping to select a circular pattern and somehow place the finger grips using the angular feature. ???

[aviatorblc]

I've figure out the finger grip challenge and I believe your answer has cleared up my question. I'll accept your answer.

Thanks again.

[jhackney1972]

I am looking at your sketch and I have a question.  The outside rim of the wheel is some other shape than flat, right?  The spokes are what shape?  If they are flat, the fillets between the spokes and outside rim of the wheel should not be in this sketch, they should be applied in the model between the spokes and the rim.  I will constrain your sketch and give you pointers but the sketching method really should depend on the shape of the rim and spokes.

[jhackney1972]

Here the the sketch constrained as I would do it.  I am sure the rim is a different shape but I will not get into that.  Screencast will give you a few pointers.  Sketch model is attached.

[aviatorblc]

Please forgive me for not making clear that this wheel a flat blank to be cut from 11 ga. steel, iir. The wood rims will be riveted to this steel "core." See attached photo of the original wheel.