topic Re: Joints between sketch and construction geometry in Fusion Design, Validate & Document Forum

Joints between sketch and construction geometry

MAS.DPL — Sat, 22 Mar 2025 19:30:01 GMT

I wish in assemblies that Joints could be between sketch/construction Geometry ..
As well as between features (holes, shafts, edges etc.).

Vital for
a) conceptual mechanism layouts
b) Checking ‘as built’ Alignments (as below)
c) exploring options using parametric parts in assemblies

There are workarounds eg for the example below, by using 'dummy' axles and ball joints etc.
.. any other good workarounds ?? .....or am I missing something ???

BUT ... for much design work I really miss Joints between sketch/construction Geometry (as in SWKS, Onshape, etc and all higher end CAD).

🙏

Re: Joints between sketch and construction geometry

davebYYPCU — Sun, 23 Mar 2025 01:43:09 GMT

Sent the file. You can do as requested in Fusion Joints, when preparation is prepared.

Might help…

Re: Joints between sketch and construction geometry

MAS.DPL — Sun, 23 Mar 2025 13:32:56 GMT

Thats REALY interesting - so why when I have 2 components cant I get their sketches to play nice and use joints between them ?

.. if this where a mechanical joint it would be a 'sliding swivel joint' but if can get sketches to do the same, that would work (and savee me making dummy components). I'll play and get back - thanks for your input.

Re: Joints between sketch and construction geometry

g-andresen — Sun, 23 Mar 2025 15:01:36 GMT

Hi,

1. side > use joint on axis center

2. side > use "between faces" option

(view in My Videos)

günther

Re: Joints between sketch and construction geometry

MAS.DPL — Sun, 23 Mar 2025 14:56:24 GMT

Workaround ... (the circle centre in the example Dave kindly sent 🙏 slides and rotates, but does not swivel)

to get a Sliding-Swivel Joint (if a sketch/construction point could be joined to a line ? - this would not be necessary )

Re: Joints between sketch and construction geometry

davebYYPCU — Sun, 23 Mar 2025 20:59:04 GMT

What do you say swivel means. Revolve or maybe Ball Joint?

I have no idea what’s required, even with that latest pic.

so why when I have 2 components cant I get their sketches to play nice

need that file to review.

Re: Joints between sketch and construction geometry

MAS.DPL — Mon, 24 Mar 2025 18:51:56 GMT

Yes a 'swivel' joint is a Ball joint - ie I need a ball joint that can also slide along an axis, as well as swivel through all X Y Z angles (the example slides and but just rotates around Z) . Change the joint to ball and it is fixed at a point on the line (as attached) and no longer slides along the line.

(view in My Videos)

This is sliding ball joint is simple to do in in 1 step in swks and other CAD by a point in one sketch to a line in another. But fusion needs a workaround and 2 joints as I showed.

Re: Joints between sketch and construction geometry

MAS.DPL — Mon, 24 Mar 2025 19:16:36 GMT

Thanks Gunther

In the case in your video, the 2 axes are aligned. But I dont want axes aligned at the moment hence ball joint, But that does not slide.

... I've now achieved what I need, using a dummy part and 2 joints a cylindrical joint PLUS a ball joint - please see video below.

FWIW I am reverse engineering 2 components from measurements to see if/how they align, and what adjustments need to be made.

Re: Joints between sketch and construction geometry

laughingcreek — Mon, 24 Mar 2025 20:01:07 GMT

sure seems like it would be easier to work this out with a sketch and for get the convoluted jointing.

Re: Joints between sketch and construction geometry

MAS.DPL — Mon, 24 Mar 2025 20:45:00 GMT

Its not so important for this case.

but the wish/request remains ... unconstrained sketch joints

for
a) conceptual mechanism layouts
b) Checking ‘as built’ Alignments / reverse engineering.
c) exploring options using parametric parts in assemblies

Coming from SWKS, and even Onshape, as well as high end cad , the ability is to add a link/joint from anything to anything (hole, edge, line, point, plane, etc ) with any degree of freedom is missed.