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Object SnapObject Snap

Sacramento City CollegeEngineering Design

Technology

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ObjectivesObjectives

Use OSNAP to create precision drawings

Use object snap overrides for single point selections

Set running object snap modes for continuous use

Adjust aperture size based on point selection needs

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Objectives Objectives

Use Tracking to locate points relative to other points in a drawing

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OSNAPOSNAP

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OSNAPOSNAP

The OSNAP feature of AutoCAD Means object snap Refers to the ability to “snap” exactly to a

specific point or place on an object. Endpoint of line Midpoint of line Centerpoint of circle

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AutoSnapAutoSnap

Visual cues indicate when AutoCAD has selected an OSNAP.

Endpoint Cue A square when the cursor is placed near the

object. Midpoint Cue

A triangle when the cursor is placed near the object.

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The Object Snap ModesThe Object Snap Modes

Object snap modes determine the point to which the cursor snaps.

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Setting Running Object SnapsSetting Running Object Snaps

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Setting Running Object SnapsSetting Running Object Snaps

Set the running object snaps. “Preset” object snap modes

AutoCAD automatically activates them at all point selection prompts.

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Setting Running Object SnapsSetting Running Object Snaps

Set by 1. OSNAP at Command: prompt 2. Pick Object Snap Settings button from the

Object Snap toolbar

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Object Snap ModesObject Snap Modes

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Object Snap ModesObject Snap Modes

Endpoint - finds the nearest endpoint of a line, arc, elliptical arc, spline, ellipse, ray, solid or multiline.

Midpoint - finds the middle point of any object, having two endpoints, such as a line, arc, elliptical arc, spline, ellipse, ray solid, xline or multiline.

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Object Snap ModesObject Snap Modes

Center - locates the center point of a radial object, including circles, arcs, ellipses, elliptical arcs, radial solids.

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Object Snap ModesObject Snap Modes

Quadrant - picks the closest of the four quadrant points that can be found on circles, arcs, elliptical arcs, ellipses, and radial solids.

Intersection - picks the closest intersection.

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Object Snap ModesObject Snap Modes

Apparent Intersection - selects a visual intersection between two objects that appear to intersect on the screen, but may not intersect in 3d space.

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Endpoint Object SnapEndpoint Object Snap

Endpoint Object Snap This snap setting is often selected as a

running object snap Type END at the prompt Pick the Endpoint button Select Endpoint from the cursor menu Prompt is a small square

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Midpoint Object Snap Midpoint Object Snap

Midpoint Finds and picks the midpoint of a line,

polyline, or arc. Type MID at the prompt Pick the Midpoint button Select Midpoint from the cursor menu Position cursor near the midpoint of the object Prompt is a small triangle marks the midpoint

where the line will snap

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Center Object SnapCenter Object Snap

Center option Snaps to the center point of a circle,

doughnut, ellipse, elliptical arc or arc Type CEN Pick Center button Pick Center from the cursor menu Locate the cursor near the object whose

center is to be located Prompt is a small circle

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Quadrant Object SnapQuadrant Object Snap

A quadrant is a quarter section of a circle, doughnut, ellipse, elliptical arc or arc.

The Quadrant object snap mode finds the 0o, 90o, 180o and 270o positions on these objects.

Move cursor near one of these locations to snap to them

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Intersection Object SnapIntersection Object Snap

The Intersection Option is used to snap to the intersection of two or more objects. Type INT Pick Intersect Button Pick Intersection from the cursor menu

A small ‘x’ marks the intersection Only appears when the cursor is close to the

intersection point of the two objects

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Intersection Object SnapIntersection Object Snap

If the cursor is near an object but not close to an actual intersection, the SnapTip reads Extended Intersection

AutoCAD finds a projected intersection point of the two objects.

Very useful when two objects do not intersect.

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Apparent Intersection OSNAPApparent Intersection OSNAP

The apparent intersection is the point where two objects appear to intersect based on the currently displayed view.

Three-dimensional objects that are far apart may appear to intersect on the screen.

This is a valuable option when working with 3D drawings.

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Perpendicular Object SnapPerpendicular Object Snap

Allows you to draw one object perpendicular to another object Type PER at the selection prompt Pick Perpendicular button Pick Perpendicular from the cursor menu

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Perpendicular Object SnapPerpendicular Object Snap

A deferred perpendicular means the calculation of the perpendicular point is delayed until another point is picked.

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Perpendicular Object SnapPerpendicular Object Snap

Perpendicular is calculated from points picked, not as a relationship between objects.

Perpendicularity is measured at the point of intersection so it is possible to draw a line that is perpendicular to a circle or an arc.

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Tangent Object SnapTangent Object Snap

Tangent Object Snap is similar to the Perpendicular Object Snap Aligns objects tangentially. Type TAN at the selection prompt Pick Tangent from the cursor menu Pick Tangent button

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Tangent Object SnapTangent Object Snap

When creating an object that is tangent to another object, multiple points may be needed to fix the tangency point

Until both points have been specified, the object snap specification is for deferred tangency

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Parallel Object SnapParallel Object Snap

Allows you to find any point along an imaginary line that is parallel to an existing line or polyline. Type PAR at the selection prompt Pick Parallel from the cursor menu Pick Parallel button

Parallel OSNAP is similar to Extension because it requires more than one selection point.

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Node Object SnapNode Object Snap

Point objects can be snapped to using the Node object snap mode.

The point must be in visible display mode

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Nearest Object SnapNearest Object Snap

Use to specify a point on an object but which cannot be specified from any of the other snap modes.

Use when you want an object to touch an existing object, but the location of the intersection is not critical

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OSNAP OverridesOSNAP Overrides

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Object Snap OverrideObject Snap Override

An object snap override can be obtained from The Object Snap Override menu activated by

[Shift-Right-Click]. The Object Snap toolbar. Typed in from the keyboard.

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Object Snap OverrideObject Snap Override

OSNAP Overrides Is the entry of an object snap mode at a point

specification prompt. Are active for one point specification only, Override any previously set object snap

modes for that entry.

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Overriding Running Object SnapsOverriding Running Object Snaps

Running object snap Is always active if OSNAP is ON. is suspended with an object snap override.

To make a single point selection without the effects of any running object snap, enter the None object snap mode

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OSNAP ON/OFFOSNAP ON/OFF

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OSNAP ON/OFFOSNAP ON/OFF

Object snap On/Off The button at the bottom of the screen F3

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Multiple OSNAPsMultiple OSNAPs

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Using Multiple Object SnapsUsing Multiple Object Snaps

More than one object snap mode can be made active at once.

When more than one is active, AutoCAD picks the closest point. This can cause conflicts !

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Using Multiple Object SnapsUsing Multiple Object Snaps

OSNAP Conflict Example CEN and QUA conflict with each other.

No matter where you pick a circle, the closest quadrant point is always closer than the center of the circle.

So When quadrant and circle are both set active,

a quadrant point is always picked.

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Using Multiple Object SnapsUsing Multiple Object Snaps

OSNAP Conflict Example NEA (Nearest) Conflicts with almost every other mode. Nearest mode always locates the point

closest to the current cursor location.

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Using Multiple Object SnapsUsing Multiple Object Snaps

The Tab key can be used to cycle through available snap points. Press the Tab key repeatedly until the desired

point is marked.

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Changing the Aperture SizeChanging the Aperture Size

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Changing the Aperture SizeChanging the Aperture Size

When selecting a point with OSNAP, the cursor must be within a specific range to a point before it is located.

This square area is called the aperture and is invisible by default To display the aperture, pick the AutoSNAP

tab and activate the Display aperture box check box

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Changing the Aperture SizeChanging the Aperture Size

The aperture size can also be set from the Command prompt

Command: APERTUREObject snap target height (1-50

pixels)Command:

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AutoSnap SettingsAutoSnap Settings

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AutoSnap SettingsAutoSnap Settings

AutoSnap options Additional visual cues can be turned off The appearance of AutoSnap and

functionality can also be changed

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AutoSnap SettingsAutoSnap Settings Marker - toggles the AutoSnap marker Magnet - toggles the AutoSnap magnet

When active, the magnet snaps the cursor to the object snap point.

SnapTip - toggles the SnapTip display Display aperture box - toggles the display of

the aperture box Marker color - changes color of marker Marker size - changes marker size

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TrackingTracking

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TrackingTracking

Tracking allows you to visually locate points in a drawing relative to other points

To activate Tracking Pick the Tracking button from the Object Snap

toolbar Type TK or TRA at the point selection prompt Pick Tracking from the cursor menu

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Tracking - ExampleTracking - Example

Tracking allows you to visually place a circle at the center of a rectangle

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Tracking - ExampleTracking - Example Command: C or CIRCLE 3P/2P/TTR/<Center point>: TRA First tracking point: MID (pick one of the

vertical lines and move the cursor horizontally)

Next point: (pick one of the horizontal lines) Next point: (press Enter to end tracking) Diameter/<Radius><0.2500>: Command:

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TrackingTracking

Once started, Tracking remains active until you press [Enter] at a Next point: prompt The cursor locks to the axis you first move

along. If you desire to select another axis, move

back to the first point, then move in the perpendicular direction

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Polar TrackingPolar Tracking

Polar tracking works similar to ORTHO but has a wider range of options.

ORTHO and Polar cannot be used at the same time.

The cursor snaps to preset incremental angles when a point is being located.

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