topic Re: Coincident and concentric mate equivalents in Fusion Support Forum

Coincident and concentric mate equivalents

Anonymous — Thu, 21 May 2020 14:52:22 GMT

G'day everyone!

I've recently migrated from Solidworks and am struggling with the radically different way that 'joints' work.

Below you can see my two simple parts. The plate rests on the underside of the extrusion, and a set of bolts holes lines them up from above and below. In solidworks I'd simply make the top face of the plate and bottom face of the extrusion coincident, then add a concentric mate to the bolt hole to get it lined up. What's the equivalent in Fusion 360? When i select the inner diameter of both bolt holes it moves the plate to an arbitrary location where it collides with the extrusion. Then i can't move it down properly to line up.

I've attached the fusion files.

Cheers for helping me!

Re: Coincident and concentric mate equivalents

jhackney1972 — Thu, 21 May 2020 16:52:53 GMT

Please see Screencast to see my process. There are probably others as no one models in the same fashion. Since the holes in the extrusion are not on the surface, it requires three joints. My model is attached in one file, I broke your links so you may not want to use it except for example.

Re: Coincident and concentric mate equivalents

g-andresen — Thu, 21 May 2020 17:11:46 GMT

Hi,

it's as simple as anything you know.

Screencast

günther

Re: Coincident and concentric mate equivalents

jhackney1972 — Thu, 21 May 2020 18:32:48 GMT

@g-andresen You are assuming the drilled holes in the extrusion are related to the joint origin points you use on the bracket, which they are not. You have to add a calculated offset to your joints to make them line up.

Re: Coincident and concentric mate equivalents

g-andresen — Thu, 21 May 2020 18:43:49 GMT

Hi,

@jhackney1972 wrote:
@g-andresenYou are assuming the drilled holes in the extrusion are related to the joint origin points you use on the bracket, which they are not.

No I have not considered the holes, because I assumed that hammer bolts are usually used for such connections.

günther

Re: Coincident and concentric mate equivalents

jeff_strater — Thu, 21 May 2020 20:41:46 GMT

There are many ways to achieve this. I would take a different approach. I would add a joint origin into the extruded part, aligned with the hole and snapped to the outer edge. Then, you can create a rigid joint between that joint origin and the hole in the bracket. In the screencast below, there is a gap - that is due to a horrible screencast bug where if you save a design, screencast locks up... So, there is magic going on there, just that I paused the recording for the save.

Re: Coincident and concentric mate equivalents

Anonymous — Sun, 24 May 2020 10:32:58 GMT

Thanks so much John, absolutely perfect! From what i can tell, the 'Planar' joint acts as my coincident mate, and then cylindrical joint acts as my concentric mate. I'm back to work again!

Re: Coincident and concentric mate equivalents

jhackney1972 — Sun, 24 May 2020 12:16:07 GMT

@jeff_strater solution is much simpler and elegant, please try it.

Re: Coincident and concentric mate equivalents

Anonymous — Mon, 25 May 2020 02:00:43 GMT

That is astoundingly easy! Create a set of joint origins on the master part, and they reference infinitely in the assembly. I'll be using this new feature all the time now! Thanks!