topic Re: Assembly Constraints (Coming From Inventor) in Fusion Design, Validate & Document Forum

Assembly Constraints (Coming From Inventor)

sam.jenkins — Wed, 09 Apr 2025 10:04:09 GMT

I know there are loads of posts about this, but I'm really struggling so I must be missing a basic concept.

For this particular use case I'm designing my part in Inventor and using Fusion to do the CAM. In Fusion I can see my part, and I have created a part/solid that represents the CNC stock (its a non-standard shape).

I need to constrain my part inside the stock, but I'm really struggling with the concept of joints. In this case there are no mechanical joints, just alignments and offsets. Really easy in Inventor, you just constrain a few faces and put in some offsets. I can easily get my part centred in the stock with the exact Z offset I need.

How do you tackle this kind of thing in Fusion with joints?

Betreff: Assembly Constraints (Coming From Inventor)

g-andresen — Wed, 09 Apr 2025 10:10:20 GMT

Hi,

@sam.jenkins schrieb:

How do you tackle this kind of thing in Fusion with joints?

What kind?

Please share the file for reply.

File > export > save as f3d on local drive > attach to post

günther

Betreff: Assembly Constraints (Coming From Inventor)

sam.jenkins — Wed, 09 Apr 2025 10:15:33 GMT

Hi Günther,

I've created a simple example that I think represents what I'm trying to do. 'Test Piece' is the model, 'Test Piece Stock' is the CNC stock to be machined.

I would like to get the model centred inside the stock (in x & y), and offset from the top surface by say 2mm.

Thanks,

Sam

Betreff: Assembly Constraints (Coming From Inventor)

g-andresen — Wed, 09 Apr 2025 10:43:29 GMT

Hi,

like this?

(view in My Videos)

günther

Re: Assembly Constraints (Coming From Inventor)

sam.jenkins — Wed, 09 Apr 2025 11:24:25 GMT

Hi Günther,

Thanks for taking the time to do this, unfortunately I simplified the example too much.

In my real part, the rim of the part isn't continuous, its actually multiple surfaces, and its not a circular revolution - its more of an oval/spline. All this to say that there isn't a simple plane and point to select for the joint. But you have given me some clues and I guess I need to construct a sketch/surface with a point in the centre. I'll give this a go.

Thanks,

Sam

Re: Assembly Constraints (Coming From Inventor)

g-andresen — Wed, 09 Apr 2025 13:08:29 GMT

Hi,

1. Then show the real part and explain how it should be aligned in terms of orientation and spacing.

2. Instead of a sketch, it is more effective to create a joint origin.

günther

Re: Assembly Constraints (Coming From Inventor)

sam.jenkins — Wed, 09 Apr 2025 13:34:39 GMT

Hi Günther,

To share the real part I would need an NDA in place, and certainly wouldn't be able to post it on a public forum.

I'll investigate joint origins, thanks for the tip.

Sam