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# CADD-1 Lesson 5

### Unit 7-9 (Methods of Drawing, Help, & Object Snaps)

CommandDefinition
Absolute Method Uses an x,y coordinate pair measured from the origin.
Relative Method Uses an x,y coordinate pair measured from the last point selected.
Polar Method Uses an exact distance at a specific angle (or direction) based on a 360 degree circle.
Polar Tracking Recurring angles that provide a temporary alignment path for angles.
OSNAP modes Allow you to snap (or grab) predefined points on an existing object.
X axis Horizontal
Y axis Vertical
Origin Where the x and y axis meet, value is 0,0.
Specifying points with keyboard Advantage is that is more accurate
Specifying points with mouse Advantage is that it is faster.
Running Object Snaps Allows you to lock on one or more of the OSNAP modes so that they are automatically available to you.
Apperture Box Also known as the target box, controls the size of the target box.
Center snaps to the center of an arc or circle.
Endpoint snaps to the endpoint of a line or an arc.
Intersection snaps to the intersection of any entities that meet or cross each other.
Midpoint snaps to the exact middle of a line or arc.
Nearest sanps to the point on any entity that is closest to the crosshairs.
Perpendicular snaps to a point on any entity that forms a 90 degree angle.
Quadrant snaps to the closest quadrant point on an arc or circle.
Snap From allows the operator to position the crosshairs from a specific point without drawing construction lines.
Extended Intersection snaps to the apparent intersection of two lines if they were extended.
Tangent snaps to the point on an arc or circle that is tangent to the previous point.
AUDIT command checks the validity of the drawing and fixes any errors
RECOVER command runs an audit of the drawing and attempts to open a damaged drawing file.
AutoCAD's Preview Feature allows you to locate files by looking at them prior to opening the file.
Help commands provides for help on Autocad commands.
Context Sensitive Help takes you directly to help on an active command.
F1 function key Access AutoCAD help.
F2 function key Access AutoCAD Text window
F3 function Key Toggles running OSNAPS on/off
Drawing recovery Manager Allows you to see which files are recoverable or have backup files.
Dynamic Input Allows you to view command line & input information at the crosshairs.
Cartesian Coordinate System coordinate system where the values for x,y are both positive. (World Coordinate System in AutoCAD)
Created by: tmurphy

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