Rack And Pinion not working

[ken]

I've created a rough rack and pinion using the pattern generator around a cylinder and rectangle and combined the teeth to each using the combine/join command.  So far so good.

Now I would just like to get the gear to spin when i move it along the rack but I'm stuck.  I've tried doing an as-built-joint/slider and I can slide the gear along the rack, then tried adding a contact set so the gear teeth would mesh, but this just makes the gear stop sliding as the gear won't rotate and the contact prevents sliding at all.  I tried adding a joint origin the the center of the pinion, but i just can't get the pinion to spin when I try and slide it along the rack and if it won't spin, it won't move.  What am I missing?  Thanks.

[Mike.Zhang]

Sorry to make your confusion on this issue.

Currently it's a limitation in Fusion 360, Joint + Contact is not working well on Gear Motion Assembly.

You can add a Motion Link between the two Joints to get a similar result, though it's not a best way.

I've attached a model created by myself to show you the way.

https://screencast.autodesk.com/main/details/99f8cc8b-3568-401a-bd04-5601be6bd44b

[Mike.Zhang]

Logged a issue to track it to make it better in future.

FUS-15844.

[ken]

Thank you Mike.  I've tried to repeat the operation in my file but when I add both a joint in place/slider to the rack/pinion and joint in place/rev to the rack/pinion (after getting a message "a joint already exists, do you want to continue? and selecting Yes) I can't animate either.

I tried to upload your attachment but I get a message that your file was created in a newer version than mine (I downloaded this version 3 days ago).

Thanks,

Ken

[Mike.Zhang]

Sorry to make your confusion. Seems I just used a internal build to create it.

Attached a new model created on the release build for your reference.

[Mike.Zhang]

If you can share your model here, I also can look into it to give you some suggestion.

[vilts]

Any new updates regarding making rack and pinion relationships? The aforementioned method with 2 joints and motion link works, but are there maybe better options (in the future)?

[Anonymous]

Hi Mike,

Thanks for publishing the rack and pinion.  It's been a useful insert.

Do you know if there's any way to create the same effect along a curved rack?

Thanks!

[Anonymous]

Hi

I have a kind of the same problem. I have a revolute joint on a pinion and a slider joint on a rack. There is a motion link between those 2 joints.

The pinion is not rotating but the slider is moving.

When i run the example [Rack and pinion Nov] , i have the same issue (rack is moving, pinion is not).

Does this have to do anything with preferences?

[TrippyLighting]

No, that does not have anything with preferences but exclusively with your design and how its structured.

If I remove al the unnecessary position capture features from the design it works.

However, there's more.

When you created the 1st joint this is between the top level component and a subcomponent.

It is not between subcomponents. When you selected geometry you selected the body in the top level bodies folder. that's not a good idea. That body should be in its own component, but it is still part of the top level component, the root of the browser/design.

The way you mistakenly created this assembly it appears that grounding the two POM blokje v3 (1) assemblies works, but if you remove the grounding from these assemblies you still cannot move them, because you assembled the first one to the top level (origin) by referencing the body in the top level.

You also have a yellow highlighted sketch in the timeline, that should fixed.

I attached a functioning model. I only removed all the position capture features and the 2 ineffective groundings on the Blokjes.

[Anonymous · Accepted solution]

I compaired your solution with my design and i found the error. In the Motion Link dialog box, the rotation angle was set at 0°. I learned from it.

Thanks for your help.

[Anonymous]

Hi everyone

INFO

at a certain moment today, all my designs with a motion link included, stopped working.

Rebooting Fusion and the PC did not change that.

They are back working now after i changed the preferences General\Graphics Driver from Auto Select to DirectX 9.