# 1 MIN 1 CAD: Let’s Get to Know CAD Commands Beginning with C

2019-09-20 12:40:54
Hello everyone, long time no “C”! I hope that my last two articles of this series help with your design work. This time, I am introducing five practical CAD commands beginning with C. Let’s cut to the chase and get to know them!

## CHAMFER

In 2D or 3D drafting, CHAMFER can be used to make a cut on a corner or along an edge. It is so versatile a command that you can apply it to different objects, such as lines, polylines, cylinders, etc. and execute it in several modes. The following examples show how I would normally use it.

#### Steps for a 2D chamfer in the TRIM mode:

1. Input [CHAMFER] and press Enter.
2. Input “d” (for distances) and press Enter.
3. Specify the two chamfer distances (the length from the endpoint of one selected line to that of the chamfer line) respectively and press Enter. In the case below, it is 60 on both lines.
4. Select the entities (two connected lines in the case below), between which the chamfer will be generated.
As you can see below, a 60 X 60 chamfer has been created on the corner.

#### Steps for a 3D chamfer in the TRIM mode:

1. Choose one of the four views on the menu as you like.
2. Input [CHAMFER] and press Enter.
3. Click a line, and one of the two faces connected by it will be automatically selected.
4. Input “OK” and press Enter. (If the face selected is not what you want, input “NEXT” and then press Enter twice).
5. Specify the two chamfer distances (the length from the endpoint of the edge to that of the chamfer line) respectively and press Enter.
6. Select an edge on the selected face to decide where you want the chamfer to be and press Enter.
Then you can get a 3D chamfer on a solid entity. You can tell from the GIF below that the chamfer angle is determined by both chamfer distances, in this case, 45° is determined by 50 X 50. [su_spoiler title="Tips" open="yes" style="fancy" icon="chevron-circle"]1. Always identify the chamfer distances or else nothing will be changed. 2. You don’t necessarily need a corner to make a 2D chamfer! Input CHAMFER and select two separate lines and a chamfer will be automatically created to connect them. If you just want to join two lines without creating a chamfer, simply set the chamfer distances to zero and select the lines.[/su_spoiler]

## CIRCLE

With this command, you don’t have to run around in circles trying to draw a circle! If you pay attention to the command line (A good habit that you should develop!), you can see that there are 3 other modes (2 Points/3 Points/Tangency, Tangency, Radius) to create one. To use them, just enter their abbreviation (2P/3P/TTR) after step 1 below.

#### Steps to draw a simple circle:

1. Input [C] and press Enter.
2. Specify the center point of the circle.
3. Specify the radius of the circle by entering a specific number or randomly moving your mouse.

#### Steps to draw a circle with 2 or 3 points:

1. Input [C] and press Enter.
2. Enter “2P” or “3P” according to whether you want to draw a circle with 2 points or 3 points.
3. Specify the 2 or 3 points one after another.
Then you can get a circle based on these points. As for the TTR mode, you will need to specify the two points of tangency, and then the radius, which should be calculated beforehand. Otherwise, the circle created will not be at the two points of tangency you’ve specified.

[su_spoiler title="Tips" open="yes" style="fancy" icon="chevron-circle"]1. Please always remember to first switch on Object Snap by pressing the F3 key or clicking its icon on the status bar.

Then click “Settings” in the right-click menu of the icon to invoke the Drafting Settings dialogue box.

Lastly, check “Tangent” as one of Object Snap modes. By this means, your point selecting can be more accurate.

2. Moreover, when you click the drop-down under the Circle icon in the toolbar, you will find that there are totally 6 methods to draw a circle.

[/su_spoiler]

## CLEANSCREENON & CLEANSCREENOFF

Too many panels crowding the workspace? This pair of commands help you control the display of them conveniently.

#### Steps:

1. Input CLEANSCREENON to hide all the opened panels.
2. Input CLEANSCREENOFF to show the complete drawing interface with the previously opened panels.

## CONE

You can easily create a cone with this command. Remember to choose a view in advance like you do when making a 3D chamfer.

#### Steps to create a cone:

1. Input [CONE] and press Enter.
2. Determine the center of the bottom.
3. Define the radius of the bottom.
4. Specify the height of the cone.
Then you can get a cone of a specific radius and height. Despite what its name suggests, you can do more than drawing cones with this! By adjusting the top radius or diameter, cylinders and truncated cones can also be created. To draw them, just perform 2 more steps and be careful with the radiuses.

#### Steps to create a cylinder or a truncated cone:

1. Repeat step 1-3 above.
2. Input “t” and press Enter.
3. Specify the top radius. (Make it the same as the previously set bottom radius if you are to create a cylinder, and a different radius for a truncated cone.)
4. Specify the height.
There you go - cylinders and truncated cones take similar steps to draw.

[su_spoiler title="Tip" open="yes" style="fancy" icon="chevron-circle"]To make your 3D entity look more stereoscopic, enter the ISOLINES command to increase the number of lines on a curved surface.

[/su_spoiler]

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