It's rotating in one plane.

它在一個平面內旋轉。

What if you need rotational motion in all three degrees of freedom?

如果需要所有三個自由度的旋轉運動怎麼辦？

How would you produce that?

如何製作？

That's what we're going to talk about in this video, and we use a rod-end ball joint, which is this piece of hardware right here.

這就是我們要在本視頻中講述的內容，我們使用的是杆端球形接頭，也就是這裡的這塊硬件。

You can see that there's this joint, it's like a ball joint inside that moves very smoothly and freely.

你可以看到裡面有一個關節，就像一個球形關節，可以非常順暢自如地移動。

Some of them don't move quite as freely as this one, at least not until they've been broken in, kind of loosened up a little bit, but ultimately you have this really smooth, very controlled motion in three degrees of rotational freedom.

但最終，你可以在三個旋轉自由度內進行非常流暢、受控的運動。

What would happen typically is you'll have some kind of a shaft that gets placed through the center of that ball, and now this shaft can move in three degrees of freedom.

通常的情況是，你會有一個軸穿過球的中心，現在這個軸可以在三個自由度內移動。

You might put some retaining rings or something, like right here, so that axially the shaft cannot move, and it's locked in there axially, but rotationally it's free to move this way.

你可以放一些擋圈之類的東西，就像這裡，這樣軸就不能移動，軸向被鎖在那裡，但旋轉時可以自由移動。

That would be one degree of freedom, like that.

這將是一個自由度，就像這樣。

Another degree, second degree of freedom would be like that, and then third degree of freedom would be spinning, like that.

另一個程度，第二自由度就是這樣，然後第三自由度就是旋轉，就像這樣。

These rod-end ball joints, they're also called heim joints sometimes, these produce that type of rotational freedom in three different degrees.

這些杆端球形接頭，有時也被稱為 Heim 接頭，可產生三種不同程度的旋轉自由度。

If you found this content helpful, consider enrolling in our Signature Program at mypipelineacademy.com.

如果您覺得這些內容對您有幫助，請考慮加入我們的簽名計劃，網址是 mypipelineacademy.com。

Whether you're an individual interested in beginning a new career as a mechanical designer or a company interested in training your new engineering hires, our Signature Program helps students develop the practical skills they need to be productive mechanical design engineers.

無論您是有意開始機械設計師新職業的個人，還是有意培訓工程新員工的公司，我們的特色課程都能幫助學生掌握成為高效機械設計工程師所需的實用技能。

Seating is limited.

座位有限。

We hope to see you there soon.

我們希望很快在那裡見到您。