topic Re: I can't find the unconstrained point in Fusion Support Forum

I can't find the unconstrained point

Cad4fish — Mon, 02 Oct 2023 22:59:42 GMT

Can someone take a look at this file and see where I have an unconstrained point.? I'm able to extrude the part and move on, but this is driving me crazy.

Re: I can't find the unconstrained point

jeff_strater — Mon, 02 Oct 2023 23:22:12 GMT

It's here:

adding this dimension will fully constrain the sketch:

Re: I can't find the unconstrained point

HughesTooling — Tue, 03 Oct 2023 09:48:24 GMT

@Cad4fish The way you created this sketch is not very efficient, you should try keeping the sketch as simple as possible and add features like fillets to the model. You also used the Fix constraint that means the sketch is not parametric and edits would be difficult.

You can simplify the sketch to just this. I wasn't sure about the depth of the slot so rounded it to 1.1".

Then add the fillets to the model. File's attached.

Re: I can't find the unconstrained point

TheCADWhisperer — Tue, 03 Oct 2023 12:41:50 GMT

In addition to the comments by @HughesTooling to simplify by adding fillets as Features rather than in sketch - I would also use Slot and I would make use of symmetry about the Origin (this will pay dividends later).

There is no need to trim - that would only complicate the constraints.

You could select the top arc and mash x on the keyboard to convert to Construction, but again, this isn't really necessary.

Re: I can't find the unconstrained point

Cad4fish — Tue, 03 Oct 2023 17:49:15 GMT

Thanks for that. I did not notice the color of that dot and would have never thought the end of a construction line needed a dimension.

Re: I can't find the unconstrained point

Cad4fish — Tue, 03 Oct 2023 17:51:44 GMT

My limited experience with solid modeling is with Inventor. Why is it better to fillet the model rather than the sketch? The depth of the slot is not very important; only the width.

Re: I can't find the unconstrained point

Cad4fish — Tue, 03 Oct 2023 17:53:44 GMT

Can you explain a bit about symmetry about the origin?

Re: I can't find the unconstrained point

Cad4fish — Tue, 03 Oct 2023 17:56:13 GMT

Thanks to all of you for your replies. I need to do another one just like this, but with a wider slot.

Re: I can't find the unconstrained point

Cad4fish — Tue, 03 Oct 2023 20:27:34 GMT

Maybe I should add that this is for a plasma cutting table.

Re: I can't find the unconstrained point

TheCADWhisperer — Tue, 03 Oct 2023 20:28:07 GMT

@Cad4fish wrote:
I need to do another one just like this, but with a wider slot.

@Cad4fish

Attach your new file here.

Re: I can't find the unconstrained point

nigel76FS8 — Tue, 03 Oct 2023 22:16:52 GMT

If you add a parameter for the diameter of the circle, you can then change that and the slot width will auto-update. Which is half the point of using a parametric bit of software. Likewise, a parameter for the chamfer or fillet can make life far easier.

Re: I can't find the unconstrained point

davebYYPCU — Tue, 03 Oct 2023 22:48:32 GMT

2d Profile cutting is a 3 step process.

Simple sketch,

model the plate to finished outline,

export face of the plate with new sketch.

If you don’t (want to) model the plate, (with modelling fillets etc,) you will be struggling with sketch constraints all day.

Might help....

Re: I can't find the unconstrained point

Cad4fish — Tue, 03 Oct 2023 22:59:31 GMT

I've been extruding my sketches to the thickness of the material and just following the Langmuir steps for manufacture/cutting. I don't know that extruding the part to the exact thickness in F360 is terribly important. You are going to set the i/m in F360 and set the amps and psi on the plasma cutter. I've made a few throw-away designs to learn the machine. This will be my second tool. The first was a wrench to replace a lost router wrench.

Re: I can't find the unconstrained point

nigel76FS8 — Tue, 03 Oct 2023 23:15:18 GMT

Yes, but you might as well set it to the correct thickness. It's no more effort.

Re: I can't find the unconstrained point

davebYYPCU — Tue, 03 Oct 2023 23:36:27 GMT

You didn't say if you need step3, (using Fusion CAM after step 2?)

Might help....

Re: I can't find the unconstrained point

Cad4fish — Wed, 04 Oct 2023 22:02:24 GMT

I finished the wrench. It's the one in the photo.