topic Re: Cam and Follower Problem in Fusion Design, Validate & Document Forum

Cam and Follower Problem

mikeYEAME — Wed, 05 Sep 2018 13:47:18 GMT

I want to animate this Cam and follower set in order to analyse the gradients/forces exerted on the cam follower. The cam shape is derived from two splines and two arcs. I am using a sliding joint on the follower, revolute joint on the cam and the guide pins are grounded. I have a contact set between the cam and follower. As can be seen from the screencast the cam rotates until it reaches the spline, stops and then skips over to the next arc. It rotates a couple of times and then collapses. Is there a way to improve this or is it too much computationally?

rgs Mike

Re: Cam and Follower Problem

Marco.Takx — Wed, 05 Sep 2018 13:53:08 GMT

Hi @mikeYEAME,

Please place your question on the Fusion 360 Design, Validate & Document forum.

This is the Fusion 360 Computer Aided Machining (CAM) forum.

If my post answers your question Please use .Accept as Solution & Kudos This helps everyone find answers more quickly!

Cam and Follower Problem

mikeYEAME — Wed, 05 Sep 2018 14:02:15 GMT

rgs Mike

Re: Cam and Follower Problem

JDMather — Wed, 05 Sep 2018 15:12:26 GMT

@mikeYEAME wrote:

... in order to analyse the gradients/forces exerted on the cam follower.

Do you have access to Autodesk Inventor Professional with Dynamic Simulation?

(Students can download Inventor for free from http://www.autodesk.com/edcommunity )

Can you File>Export and then Attach your *.f3d file here?

Re: Cam and Follower Problem

TrippyLighting — Wed, 05 Sep 2018 16:18:52 GMT

The problem is that a CAM follower would require a specific joint n Fusion 360 to be created efficiently.

The only workaround is to use contact sets.
The problem with that is that contact sets are an incredible resource hog and in this case it seems that the animation module does not wait for the contact sets to finish their calculation and thus it looks like it skips.

Unfortunately I don't have a good answer how to tackle this.

Re: Cam and Follower Problem

sanket223.patil — Wed, 05 Sep 2018 17:24:09 GMT

Contact sets is only you can use here , when you click on animate joint it is going to skip the main step . Manually by dragging it will work . Once i working a cam , it was skiping when the cam touches the push rod.

Can you share the file .

Re: Cam and Follower Problem

chrisplyler — Wed, 05 Sep 2018 18:24:25 GMT

1. Need a revolve joint for the cam, of course.

2. Need a slider joint for the follower, lined up in the right direction, with max and min limits representing the high point of the cam and the low point of the cam, with the rest position at the low point value. This gives the spring action down to the low point.

3. Need a contact set between the cam and the follower, of course.