topic Re: Simple Nut and Bolt Joints ... in Fusion Design, Validate & Document Forum

Simple Nut and Bolt Joints ...

Trigg3r — Sun, 02 Nov 2014 20:04:44 GMT

Ok so maybe I'm missing something, but for the life of me, I cannot get a Nut and bolt to screw together using joint/joints and a motion link.

Cylindrical has movement in the required directions but no constraint on distance per revolution, and if I use a revolute plus a slider both components appear locked in place. I assume one of the components needs to be grounded ?

I've watched the video on Motion link numerous times but that seems to be based around external influences to guide the nut/jaw of the vice.

Anyone, before I loose my marbles ? 😄

Cheers.

Re: Simple Nut and Bolt Joints ...

schneik-adsk — Sun, 02 Nov 2014 22:39:15 GMT

this is an ugly but working workaround...
Create a cylindrical joint between the nut and screw.
Create a second redundant cylindrical joint between the same two components.
Create a motion link between these two joints and use the revolute degree of freedom from one an the sliding degree of freedom from the other. enter the linear distance = 1 revolution as the distance and angle and you will have a working "screw" movement.

Re: Simple Nut and Bolt Joints ...

Trigg3r — Mon, 03 Nov 2014 11:50:23 GMT

Thanks schneik, thats what I was after.

I'd have thought a simple revolute & slider with a motion link would have done the job, or even an option in cylindrical of travel ratio to maybe do it with one joint ?

Either way it's done now with your workaround.

Cheers.

Re: Simple Nut and Bolt Joints ...

Anonymous — Sun, 16 Oct 2016 05:52:19 GMT

Thanks for the solution . But how to prevent the interference between threads ?

Re: Simple Nut and Bolt Joints ...

Anonymous — Sun, 30 Oct 2016 19:05:15 GMT

@schneik-adsk wrote:
this is an ugly but working workaround...
Create a cylindrical joint between the nut and screw.
Create a second redundant cylindrical joint between the same two components.
Create a motion link between these two joints and use the revolute degree of freedom from one an the sliding degree of freedom from the other. enter the linear distance = 1 revolution as the distance and angle and you will have a working "screw" movement.

Has something changed in Fusion since this workaround was posted? Because I can't get this to work in my model at all.

I've created the two cylindrical joints and am trying to get the motion link setup, but can't seem to get it to do anything when I click on animate to see the result. I can get the individual joints to slide and rotate respectively, but can't get the two to combine into the one action.

I was really hoping there would be a simple command to make a joint between two matching screw threads (one on the "bolt" and the other on the "nut") fit together with the correct number of rotations & range/limit of movement. I mean surely that's the logical extension to being able to create a screw thread in the first place, no?!

Re: Simple Nut and Bolt Joints ...

TrippyLighting — Sun, 30 Oct 2016 21:10:44 GMT

Yes, many things have changed since 2014 when this "workaround" was posted.

No, that still works.

Please post your model so we can look at it an see what the problem might be.

Re: Simple Nut and Bolt Joints ...

Anonymous — Tue, 01 Nov 2016 04:58:29 GMT

Maybe,it's not about the joint to be created. it is about the interference between the threads of components.

Like a clash occurring between the component surfaces intersecting each other.

Re: Simple Nut and Bolt Joints ...

bradjshannon — Sun, 27 Nov 2016 06:23:27 GMT

Same exact issue here.

Following the "workaround" posted above to the letter.

I can create two cylindrical joints and each animates properly. However, when I create a motion link between them, there is no motion at all. Nothing animates.

Try it with any nut & bolt from McMaster!

Re: Simple Nut and Bolt Joints ...

TrippyLighting — Sun, 27 Nov 2016 19:48:35 GMT

This still works. However it helps to understand that the cylindrical joint hat 2 degrees of freedom or in Fusion 360 speak it combines a revolute and slider joint.

What you need to do with the motion link is to link the slider joint part of one cylindrical joint to the revolute joint part of the other cylindrical joint.

Re: Simple Nut and Bolt Joints ...

bradjshannon — Sun, 27 Nov 2016 21:27:32 GMT

Did that. Did not work. Crashed app twice.

Trial 1:
Made cyl as-built joint using nut then bolt.
Made another using nut then bolt.
Both joints animate. Animate model works.
Motion linked as you described.

RESULT: No animation from motion link window or "animate model." App freeze
and CTD after a minute or so.

Trial 2:
Made cyl as-built joint using nut then bolt.
Made another using BOLT THEN NUT.
Both joints animate. Animate model works.
Motion linked as you described.

RESULT: No animation from motion link window or "animate model." App freeze
and CTD after a minute or so.

Trial 3:

Made revolute as-built using nut then bolt.
Made slider using nut then bolt.
Motion linked.

RESULT: No animation from motion link window or "animate model."

Trial 4:
Made revolute using bolt then nut.
Made slider using NUT THEN BOLT.
Motion linked.

RESULT: No animation from motion link window or "animate model."

Trial 5:
Made cyl as-built joint using NUT then "frame" component.
Made cyl as-built joint using BOLT then "frame".
Both joints animate. Animate model works.
Motion linked as you described.

RESULT: No animation from motion link window or "animate model."

Trial 6:
Made cyl using NUT THEN A LOCKNUT that happens to be on the bolt (thus
colinear).
Made cyl using BOLT THEN "frame" component.
Both joints animate. Animate model works.
Motion linked as you described.

RESULT: SUCCESS

Seems that one does need to make two cylindrical joints, but they cannot
share components AT ALL.

This was really fun to figure out, let me tell you 😕

Re: Simple Nut and Bolt Joints ...

bradjshannon — Sun, 27 Nov 2016 21:27:33 GMT

Re: Simple Nut and Bolt Joints ...

TrippyLighting — Sun, 27 Nov 2016 21:51:43 GMT

Two things;

1. You may want to figure out why you are posting everything twice 😉

2. You need to make two cylindrical joints between the same components selecting them in the same order.

If you'd taken any look at the .f3d oder file I attached to my last post this should have been taken one attempt.

Re: Simple Nut and Bolt Joints ...

Trigg3r — Tue, 07 Feb 2017 05:35:55 GMT

As an update to this you can now simply create one cylinder joint between nut and bolt, and then when creating the motion link, choose link with same joint.

Re: Simple Nut and Bolt Joints ...

Trigg3r — Tue, 07 Feb 2017 16:40:13 GMT

I've just added a solution to the interference problem on the other later thread here ->

https://forums.autodesk.com/t5/design-validate-document/how-to-motion-link-a-threaded-nut-and-bolt/m-p/6859448/highlight/false#M96733