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# How can i get movement along two axis at the same time on a universal joint?

Member Posts: 2
I'm figuring out how to create a universal joint, but I've some problems with the motion; the cross should be able to rotate on both yokes, but right now I don't know how to combine the two movements. When I move one yoke along the axis I've choosen I'm not able to move the cross also in the other direction. At the end the I can't move anything because there are some constraints and I don't know how to solve it.

• Member, Developers Posts: 2,215 PRO
Hi and welcome to the forum.

Please will you have a quick read of this and then put a screen-grab / link to your document and I'm sure somebody will jump in and help.

Cheers,

Owen S.
Production Engineer
HWM-Water Ltd
• Member, Moderator, Onshape Employees, Developers Posts: 1,245
As soon as you post a link, all your wishes will come true!
Philip Thomas - Onshape
• Member, Moderator, Onshape Employees, Developers Posts: 1,245
edited June 2018
There are also quite a few Universal Joints in the public documents!

Philip Thomas - Onshape
• Member, Developers Posts: 1,712 PRO
edited June 2018
You can think of it exactly as it moves in the real world.

Each axis of the cross is revolving around the pin in the yellow joint

so it is as simple as that. Every axis is just a revolute mate attached to the yellow pin hole.
(4) axis in total, so (4) revolute mates in total.

To get the animation above there are (i'm assuming) hidden parts on the two opposite ends. Each of the yellow ends will also have (1) revolute mate to that hidden part.

Everything else should be (forced) into position. Any more mates would over define it and it won't work

Almost forgot the fixed mate attaching the two u-joints (if you wanted two as shown in the model above)
• Member, OS Professional, Mentor Posts: 1,831 PRO
Engineer ı Product Designer ı Onshape Consulting Partner