How to Motion Link a Threaded Nut and Bolt

[MichaelTewasart]

I was wondering if it was possible to motion link a threaded nut and bolt. I know that there's a "cheap" way to do so on this post: 

http://forums.autodesk.com/t5/design-validate-document/simple-nut-and-bolt-joints/td-p/5375873

...but I was wondering if there was a more "elegant" way of doing so. One where the threaded parts are in actual contact with each other, rotate in harmony, and not clash or clip each other. Similar to this video: 

[Beyondforce]

Hi @MichaelTewasart,

Yes there is, create the Nut and Bolt and I'll show you.

Cheers / Ben
---------------------------------------------------------------------------------------------------------------------------
Did you find this reply helpful ? If so please use the Accept as Solution or Kudos button below.

Check out my YouTube channel: Fusion 360: NewbiesPlus

[MichaelTewasart]

Both the nut and bolt have the same thread settings. Now what? 

Oh, and thanks for replying.

[Trigg3r]

The motion link now has an option of 'Link to same joint' so you only need one cylinder to achieve motion.

I've updated the original thread also.

As for the no clipping, I'm not sure if you can model both threads and then use contact sets.

[MichaelTewasart]

Well, the motion works, so thanks for that. 

However, the threads still unfortunately clip as seen below:

[Beyondforce]

Will you please attach the file, it will be easier to show than to write! 😉

[TrippyLighting]

Yes, you need to set the correct pitch/motion ratio in the motion link. Also looking at the screenshots I see the you are using contact sets.

Use proper joint limits and delete contact sets. They are an absolute performance killer.

They are useful in determining what proper joint limits should be, ut once you have figured these out, delete the contact set!

[Trigg3r]

@MichaelTewasart Contact Sets really do batter the performance. There's a much easier way to align threads properly using a sectional analysis view and an offset in the original joint.

Here's a screencast and I'll attach an example file.

[Beyondforce]

Hi @MichaelTewasart,

Here you go:

Cheers / Ben.

[MichaelTewasart]

Great video. It's nearly identical what I did.

However, my problem still remains: I have no idea whether the nut's thread and bolt's thread are rotating together without clipping each other.

[Trigg3r]

@MichaelTewasart take a look at the screen cast I posted. The joints still work in sectional view to show you.

[MichaelTewasart]

Thanks for the file and video. Certainly helps a lot. However, the problem still remains: the nut's threads and the bolt's thread still overlap when in motion. Even with the z-axis offset AND the motion link, the treads still overlap as you can see above.

[Beyondforce · Accepted solution]

@MichaelTewasart, that is quite simple... your Pitch is 1.75 = 360 dg turn, the Nut travels 1.75mm 😉

This is the Pitch of the Thread you are using.

This is how the Motion Link dialob box looks like:

If you have more questions, please let us know.

Cheers / Ben
---------------------------------------------------------------------------------------------------------------------------
Did you find this reply helpful ? If so please use the Accept as Solution or Kudos button below.

Check out my YouTube channel: Fusion 360: NewbiesPlus

[MichaelTewasart]

I set the motion link's distance the same as the pitch thread and it works perfectly! The threads for both the nut & bolt don't clip each other. Thanks so much! I have a few more questions:

- What bolt and nut type did you use?

- How do you measure the pitch of the nut & thread?

Thanks so much!

[Beyondforce · Accepted solution]

The model is yours and I got the Pitch from the website bellow (there many of them). It will also show you how measure everything:
http://mdmetric.com/tech/M-thead%20600.htm

[MichaelTewasart]

Wow. Thanks for the website. One last question:

When importing 3D models from McMaster from Fusion 360, does the model list the pitch thread as well?

[Beyondforce]

I'm not sure, but you can measure it yourself. I'm going to add a new video to my channel this weekend on how to create your own threads, Joints and also how to measure the Pitch.

Stay tuned 😉

[applekourt]

Hi, Im very new to fusion 360 and i tried designing a part that involved the time of screw you used in the demonstration. i had no problem doint basically everything the same, other than the fact that i created the threads and the bolt saperately instead of using one as a tool for the other. It works perfectly until I eneble the interference setting and the it stops moving completely. I have matched the pitch of the threads to the revolutions in the motion link but it doesnt want to move whatsoever. 

Have any tips/corrections to suggest?

[laughingcreek]

---

@applekourt wrote:

... It works perfectly until I eneble the interference setting and the it stops moving completely....

---

are you talking about contact sets?  you don't want to use those at all for this.

[applekourt]

I was talking about enabling interference between all parts but I have resolved my problem by using contact sets only on the parts that needed it