scissor problem

hans2taverne — Wed, 10 May 2017 21:45:00 GMT

Hi there,

I'm trying to design a scissor operated vacuum gripper system and I'v troubles to keep the vacuum grippers in a strait line. Whatever I do gripper 2 and 4 keeps turning istead of moving in a linear direction like gripper 1 (gripper 3 is fixed)

I'm working with fusion 360 for only 4 weeks now or so maybe I need somewhat more excercise but I checked the internet regularly and I'can't find a solution.

I know fusion 360 has a found a lot of errors in my design but I don't believe that's the problem.

Can anyone help me ?

Thanks in advance,

Hans Taverne

Re: scissor problem

innovatenate — Thu, 11 May 2017 00:41:19 GMT

The timeline was pretty bad off in this design. I decided to rebuild the assembly completely rather than try to fix what was there (it was faster for me to do it this way). I utilized X-References to help me rebuild the assembly faster and reduce the amount of Joints I would need to create.

Here's a demo of me playing with the results.

There's a lot of bad practices I noted in the original design.

-cross-component geometry projection

-sketch on the faces of other components when editing a different component

-lots of unnecessary capture positions

-not utilizing instances of components (copy and paste a component (not a body)

-yellow and red warning indicate problems in the timeline - these should be fixed as they appear.

Here's some items to consider.

Use RULE #1

This means if you want to create a new component try using the following guidelines.

Create a New component
Activate that component
Use the Isolate command to hide all the other components in a design
Sketch on the root origin planes of that component
Try to avoid projecting geometry external to that component (unless absolutely necessary - sometimes it is)
Avoid sketching on the surfaces of other components

When assembling, keep in mind that Fusion has a very flat or open structure. Ground only ground the component to the parent's origin. If you're trying to ground something in an assembly, try applying a Rigid As-Build Joint between that component and the root origin in the design.

Try to use sub-assemblies or reuse components whenever possible. It looks like you have the same component reused multiple time. However, because of the way you went about creating these components, they were separate components. You can copy and paste to make a new instance of the component. You'll see instance number after the colon (:) in the component's name in the browser.

I would recommend taking advantage of instanced components when the underlying body geometry is exactly the same between the components.

The only time you need to make a new component, is when the geometry will be different.

Here is some good learning material that may help to get you started.

Assembly in Fusion AU Class
Rule Number 1 (here, here, here, here, here and here)
Best Modeling Practices
Let's talk about Joints

I've also attached a sample model you can upload in the Data Panel and explore.

I hope that helps!

Re: scissor problem

hans2taverne — Tue, 16 May 2017 12:10:42 GMT

Nathan,

Thank you very much for your reply, I know I still have to learn a lot about Fusion 360 as I started only a few month ago with 123D design and since 4 weeks with Fusion 360.

Before that I only worked in 2D systems.

I'll study the material you send me and hope that I'm able to improve my skills.

Thanks again,

regards,

Hans Taverne

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