topic Re: Spline & Offset plane in Fusion Design, Validate & Document Forum

Spline & Offset plane

jonmurua — Thu, 18 Aug 2022 12:25:45 GMT

Hello,

I hope you can help me with this issue:

The width of the main cilinder is a parameter and I am trying to modify, but when I do, the spline on the right doesn't offset accordingly and it gets deformed.

I see that the 2 planes that constrain the spline move correctly when changing the cilinder width. The start & end points of the spline seem to move correctly as well, but the intermediate points of the spline remain static and they don't move.

Any idea how to solve this?

Thank you!

Re: Spline & Offset plane

TheCADWhisperer — Thu, 18 Aug 2022 12:44:57 GMT

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

Re: Spline & Offset plane

jonmurua — Thu, 18 Aug 2022 13:48:05 GMT

Please find attached the f3d file

Re: Spline & Offset plane

TrippyLighting — Fri, 19 Aug 2022 11:42:36 GMT

Can you elaborate a bit more on the model and explain what its purpose is?

Pictures might help.

There are a number of things in the loft on the right that likely need to be changed and it might not even make sense to create it as a single loft

Re: Spline & Offset plane

jonmurua — Fri, 19 Aug 2022 14:11:43 GMT

I am not trying to design an elephant, in case that is what came to your mind 😅

This is an experiment for a finger prosthetic.

The part of the right is supposed to be a hook (double hook actually), similar to the nail of a cat.

This design is for 3D printing.

Regardless, I would expect when the plane is offset, for the spline points to offset acordingly.

The start and end points of the spline are actually offset, but not the points.

Am I missing something?

Re: Spline & Offset plane

laughingcreek — Fri, 19 Aug 2022 14:55:47 GMT

@jonmurua wrote:

...Regardless, I would expect when the plane is offset, for the spline points to offset acordingly.

The start and end points of the spline are actually offset, but not the points.

Am I missing something?

You have the endpoints of that spline constrained to the planes, so the move with the planes. the ones in the middle are just hanging there un-constrained. there's no reason for them to move just because the planes move. try dimensioning the middle point to one of the end points so they move together.

Re: Spline & Offset plane

TrippyLighting — Fri, 19 Aug 2022 15:09:06 GMT

@jonmurua wrote:

...

Regardless, I would expect when the plane is offset, for the spline points to offset acordingly.

The start and end points of the spline are actually offset, but not the points.

Am I missing something?

Yes, you are missing something!

The end points are constrained to sketch elements, which are driven. They move when those sketch elements change.

The intermediate fit points also need to be constrained /or dimensioned, probably in reference to those end points.

As such using as few fit points as possible is going to help.

A control point spline might be easier to constrain/dimension.

Re: Spline & Offset plane

jonmurua — Tue, 23 Aug 2022 21:24:35 GMT

Thanm you! That helped me, constraining the middle points solves the problem.

Re: Spline & Offset plane

jonmurua — Tue, 23 Aug 2022 21:24:58 GMT

Thank you! Constraining the middle points solves the problem.