# Connecting Two C-Channels

## What are the Orange Cylinders?

The little orange cylinders in every hole are called `Construction Circles`.  CAD likes circles when connecting (constraining) parts together because it's easy for the software to find the center.

![Construction Circles](/files/-MfFklR6CT9BngVCizjL)

## Connecting Two C-Channels

It's finally time to connect two c-channels together!  This is a two step process.  The first step is to use the insert constraint.  The second step is to use a mate constraint. 

### Insert Constraint

The insert constraint is special because it does two things for us, brings the c-channels together and aligns the hole.  

First we need to open the constraint window.  You can either press `C` on your keyboard, or go to `Assemble` in the ribbon and click `Constrain`.  Once the window opens, select `Insert`.

![Constraint Window with Insert Selected](/files/-MfFoyT5DrmMwwqZ_xwe)

Now we need to select the two holes we want to connect.  Because the insert constraint is bringing two faces together, we need to **select the sides of the part that will contact each other.**  In the gif below, I select the top of the 5x and the underneath of the 2x.  

After selecting both of your holes, click `Apply` in the constraint window.  You've successfully made your first constraint!

![Selection on 5x](/files/-MfLGMRdJB4s0m11AW0f)

![Selection on 2x](/files/-MfLGGZYpjkxla7c1o5t)

![Insert Constraint Gif](/files/-MfFo_f2Yw3WiQdyX_hv)

But there's an issue... if you select the 2x and drag it, it can rotate!  If we tried to screw two pieces of metal together with one screw, they would do the same thing in real life.  That's what's happening in here, it's only connected at one point.  We need to add our second "screw".  

![Not Fully Constrained C-Channel](/files/-MfFq9_FpcGLdevKumkF)

### Mate Constraint

The insert constraint connected the two holes concentrically and made the two faces touch.  We need to make two new holes concentric to each other. 

By default the constraint window is on `Mate`, so we don't have to select anything here after opening it. 

![Constraint Window with Mate Selected](/files/-MfFrTvSP4IMNOHQ0gWi)

Now we select the **cylinders** we want to connect.  Hover your mouse over the body of the cylinder.  If you're in the right area, you'll see a green arrow appear in the center of the cylinder.  Select this for holes on both c channels. 

After selecting both of your holes, click `Apply` in the constraint window.  You've successfully fully constrained two c-channels!

![Mate Constraint Gif](/files/-MfFsWJBAIsUMMCf2PfN)

### Final Check

If this was done correctly, you should be able to left click the two wide and drag your mouse around without anything moving.

{% hint style="info" %}
Remember to save!
{% endhint %}

## Contributors to this Article:

* Jess - EZ


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://wiki.purduesigbots.com/vex-cad/making-a-chassis/inventor-chassis/connecting-two-c-channels.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.