Object Snap1 Sacramento City College Engineering Design Technology

Object Snap2 Objectives u Use OSNAP to create precision drawings u Use object snap overrides for single point selections u Set running object snap modes for continuous use u Adjust aperture size based on point selection needs

Object Snap3 Objectives u Use Tracking to locate points relative to other points in a drawing

Object Snap4 OSNAP

5 OSNAP u The OSNAP feature of AutoCAD u Means object snap u Refers to the ability to “snap” exactly to a specific point or place on an object. u Endpoint of line u Midpoint of line u Centerpoint of circle

Object Snap6 AutoSnap u Visual cues indicate when AutoCAD has selected an OSNAP. u Endpoint Cue u A square when the cursor is placed near the object. u Midpoint Cue u A triangle when the cursor is placed near the object.

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8 The Object Snap Modes u Object snap modes determine the point to which the cursor snaps.

Object Snap9 Setting Running Object Snaps

Object Snap10 Setting Running Object Snaps u Set the running object snaps. u “Preset” object snap modes u AutoCAD automatically activates them at all point selection prompts.

Object Snap11 Setting Running Object Snaps u Set by u 1. OSNAP at Command: prompt u 2. Pick Object Snap Settings button from the Object Snap toolbar

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Object Snap13 Object Snap Modes

Object Snap14 Object Snap Modes u Endpoint - finds the nearest endpoint of a line, arc, elliptical arc, spline, ellipse, ray, solid or multiline. u 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 Snap16 Object Snap Modes u Center - locates the center point of a radial object, including circles, arcs, ellipses, elliptical arcs, radial solids.

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Object Snap18 Object Snap Modes u Quadrant - picks the closest of the four quadrant points that can be found on circles, arcs, elliptical arcs, ellipses, and radial solids. u Intersection - picks the closest intersection.

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Object Snap21 Object Snap Modes u 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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Object Snap23 Endpoint Object Snap u Endpoint Object Snap u This snap setting is often selected as a running object snap u Type END at the prompt u Pick the Endpoint button u Select Endpoint from the cursor menu u Prompt is a small square

Object Snap24 Midpoint Object Snap u Midpoint u Finds and picks the midpoint of a line, polyline, or arc. u Type MID at the prompt u Pick the Midpoint button u Select Midpoint from the cursor menu u Position cursor near the midpoint of the object u Prompt is a small triangle marks the midpoint where the line will snap

Object Snap25 Center Object Snap u Center option u Snaps to the center point of a circle, doughnut, ellipse, elliptical arc or arc u Type CEN u Pick Center button u Pick Center from the cursor menu u Locate the cursor near the object whose center is to be located u Prompt is a small circle

Object Snap26 Quadrant Object Snap u A quadrant is a quarter section of a circle, doughnut, ellipse, elliptical arc or arc. u The Quadrant object snap mode finds the 0 o, 90 o, 180 o and 270 o positions on these objects. u Move cursor near one of these locations to snap to them

Object Snap27 Intersection Object Snap u The Intersection Option is used to snap to the intersection of two or more objects. u Type INT u Pick Intersect Button u Pick Intersection from the cursor menu u A small ‘x’ marks the intersection u Only appears when the cursor is close to the intersection point of the two objects

Object Snap28 Intersection Object Snap u If the cursor is near an object but not close to an actual intersection, the SnapTip reads Extended Intersection u AutoCAD finds a projected intersection point of the two objects. u Very useful when two objects do not intersect.

Object Snap29 Apparent Intersection OSNAP u The apparent intersection is the point where two objects appear to intersect based on the currently displayed view. u Three-dimensional objects that are far apart may appear to intersect on the screen. u This is a valuable option when working with 3D drawings.

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Object Snap31 Perpendicular Object Snap u Allows you to draw one object perpendicular to another object u Type PER at the selection prompt u Pick Perpendicular button u Pick Perpendicular from the cursor menu

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Object Snap33 Perpendicular Object Snap u A deferred perpendicular means the calculation of the perpendicular point is delayed until another point is picked.

Object Snap34 Perpendicular Object Snap u Perpendicular is calculated from points picked, not as a relationship between objects. u 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.

Object Snap35 Tangent Object Snap u Tangent Object Snap is similar to the Perpendicular Object Snap u Aligns objects tangentially. u Type TAN at the selection prompt u Pick Tangent from the cursor menu u Pick Tangent button

Object Snap36 Tangent Object Snap u When creating an object that is tangent to another object, multiple points may be needed to fix the tangency point u Until both points have been specified, the object snap specification is for deferred tangency

Object Snap37 Parallel Object Snap u Allows you to find any point along an imaginary line that is parallel to an existing line or polyline. u Type PAR at the selection prompt u Pick Parallel from the cursor menu u Pick Parallel button u Parallel OSNAP is similar to Extension because it requires more than one selection point.

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Object Snap42 Node Object Snap u Point objects can be snapped to using the Node object snap mode. u The point must be in visible display mode

Object Snap43 Nearest Object Snap u Use to specify a point on an object but which cannot be specified from any of the other snap modes. u Use when you want an object to touch an existing object, but the location of the intersection is not critical

Object Snap44 OSNAP Overrides

Object Snap45 Object Snap Override u An object snap override can be obtained from u The Object Snap Override menu activated by [Shift-Right-Click]. u The Object Snap toolbar. u Typed in from the keyboard.

Object Snap46 Object Snap Override u OSNAP Overrides u Is the entry of an object snap mode at a point specification prompt. u Are active for one point specification only, u Override any previously set object snap modes for that entry.

Object Snap47 Overriding Running Object Snaps u Running object snap u Is always active if OSNAP is ON. u is suspended with an object snap override. u To make a single point selection without the effects of any running object snap, enter the None object snap mode

Object Snap48 OSNAP ON/OFF

Object Snap49 OSNAP ON/OFF u Object snap On/Off u The button at the bottom of the screen u F3

Object Snap50 Multiple OSNAPs

Object Snap51 Using Multiple Object Snaps u More than one object snap mode can be made active at once. u When more than one is active, AutoCAD picks the closest point. u This can cause conflicts !

Object Snap52 Using Multiple Object Snaps u OSNAP Conflict Example u CEN and QUA conflict with each other. u No matter where you pick a circle, the closest quadrant point is always closer than the center of the circle. u So u When quadrant and circle are both set active, a quadrant point is always picked.

Object Snap53 Using Multiple Object Snaps u OSNAP Conflict Example u NEA (Nearest) u Conflicts with almost every other mode. u Nearest mode always locates the point closest to the current cursor location.

Object Snap54 Using Multiple Object Snaps u The Tab key can be used to cycle through available snap points. u Press the Tab key repeatedly until the desired point is marked.

Object Snap55 Changing the Aperture Size

Object Snap56 Changing the Aperture Size u When selecting a point with OSNAP, the cursor must be within a specific range to a point before it is located. u This square area is called the aperture and is invisible by default u To display the aperture, pick the AutoSNAP tab and activate the Display aperture box check box

Object Snap57 Changing the Aperture Size u The aperture size can also be set from the Command prompt Command: APERTURE Object snap target height (1-50 pixels) Command:

Object Snap58 AutoSnap Settings

Object Snap59 AutoSnap Settings u AutoSnap options u Additional visual cues can be turned off u The appearance of AutoSnap and functionality can also be changed

Object Snap60 AutoSnap Settings u Marker - toggles the AutoSnap marker u Magnet - toggles the AutoSnap magnet u When active, the magnet snaps the cursor to the object snap point. u SnapTip - toggles the SnapTip display u Display aperture box - toggles the display of the aperture box u Marker color - changes color of marker u Marker size - changes marker size

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Object Snap62 Tracking

Object Snap63 Tracking u Tracking allows you to visually locate points in a drawing relative to other points u To activate Tracking u Pick the Tracking button from the Object Snap toolbar u Type TK or TRA at the point selection prompt u Pick Tracking from the cursor menu

Object Snap64 Tracking - Example u Tracking allows you to visually place a circle at the center of a rectangle

Object Snap65 Tracking - Example u Command: C or CIRCLE u 3P/2P/TTR/ : TRA u First tracking point: MID (pick one of the vertical lines and move the cursor horizontally) u Next point: (pick one of the horizontal lines) u Next point: (press Enter to end tracking) u Diameter/ : u Command:

Object Snap66 Tracking u Once started, Tracking remains active until you press [Enter] at a Next point: prompt u The cursor locks to the axis you first move along. u If you desire to select another axis, move back to the first point, then move in the perpendicular direction

Object Snap67 Polar Tracking u Polar tracking works similar to ORTHO but has a wider range of options. u ORTHO and Polar cannot be used at the same time. u The cursor snaps to preset incremental angles when a point is being located.

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