# Welcome! Drafting 1309: Basic CAD Andrew Amini Professor

Welcome! Drafting 1309: Basic CAD Andrew Amini Professor Drafting and Design Engineering Technology, HCC Drawing Commands Arc-Allows you to draw an arc using a variety of commands. COMMAND: Arc Center/: Pick a start point or type C (Center) for more options Center/End/ Pick a second point of arc or type C or E (End) for more options End Point: Pick end point of arc OPTIONS: Angle- Enter an arc in terms of degrees or current angular units.

Included Angle: Enters an angle value or use cursor to draw an angle Center: Enter the location of an arcs center point. Enter a coordinate or pick a point. 2 Drawing Commands Direction: Enters a tangent direction from the start point of an arc. Direction from start point: Either enter a relative coordinate or pick a point. End: Enters the end point of an arc. Enter a coordinate or pick a point Length: Enters the length of an arcs chord. Length of Chord: Enter a length or use cursor to drag and pick a length

Radius: Enters an arcs radius Enter a radius or pick a point that defines a radius length Start Point: Enter the beginning point of an arc An Arc can be constructed using the BREAK or TRIM commands, or FILLET for a line 3 Drawing Commands ELLIPSE commands constructs an ellipse Command: ELLIPSE Specify axis endpoint of ellipse or [Arc/Center]: Pick a point or type C for center.

Specify other endpoint of axis: Pick another point Specify distance to other axis or [Rotation] Center- Specify a center point and one end point of each axis. Rotation-Specify the rotation around the major axis. The rotation angle is between 0-89.4 degrees Isocircle- If you enable Ismetric mode, the ELLIPSE prompt will include an isocircle option. Isometric circles will be draw in the current isoplane. You provide the center point and radius or diameter. 4 Editting Commands Break-enables you to erase or split portions of lines, arcs, circles, and polylines COMMAND: BREAK METHOD 1: Select object: Select the line, arc, circle, or

polyline Specify second point or (First Point): Break second point of break METHOD 2: Select object: Select the line, arc, circle or polyline Specify second point or (First Point): Type F Specify first point of break: Pick a point (Use OSNAP) Specify second point: Pick a point 5 Editting Commands Mirror-Mirror commands makes a mirror image copy of an object or a group of objects. You can keep or delete the original objects. Command: Mirror Select Object: Pick the object to be mirrored

Specify first point of the mirror line Specify second point of the mirror line Erase source object? [Yes/No] : Enter Y to delete the objects and N to keep them Tip: If you want the line to be at 90-degree angle, turn ORTHO (F8) to make it easier to set the mirror line. If you want to mirror text (reading from right to left), set Command: MIRRTEXT (0): 1 6 Editing Commands CHPROP- Changes the properties of an object COMMAND: CHPROP Select Objects: Specifies which objects to modify PROPERTIES TO MODIFY: COLOR-Changes the color of the selected objects LAYER- Changes the layer of selected objects

Ltype- Changes the linetype of selected objects Ltscale-Changes the linetype scale factor Lweight-Changes the lineweight of selected objects Thickness-Changes the Z direction of 2D objects Transparency-Changes the transparency level of selected objects. Material-Changes the material of selected objects Annotative-Changes annotative properties Plotsytle-Changes the properties of named plot styles. 7 Editting Commands OFFSET- Offset draws parallel lines, arcs, circles, and polylines. Repeats automatically until cancelled. Command: Offset Specify offset distance or [Through/Erase/Layer]

: (1.0000) Enter a distance value or accept default Select object to offset or [Exit/Undo] : Pick the object Specify point on side to offset or [Exit/Multiple/Undo] : Pick a point or the side Select object to offset or [Exit/Undo] : Pick the object again Specify point on side to offset or [Exit/Multiple/Undo] : Pick a point on the side 8

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