1. Object Snap1 Sacramento City College Engineering Design Technology

2. 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

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

4. Object Snap4 OSNAP

5. 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

6. 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. 8 The Object Snap Modes u Object snap modes determine the point to which the cursor snaps.

9. Object Snap9 Setting Running Object Snaps

10. 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.

11. 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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13. Object Snap13 Object Snap Modes

14. 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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16. 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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18. 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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21. 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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23. 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

24. 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

25. 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

26. 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

27. 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

28. 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.

29. 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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31. 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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33. Object Snap33 Perpendicular Object Snap u A deferred perpendicular means the calculation of the perpendicular point is delayed until another point is picked.

34. 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.

35. 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

36. 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

37. 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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42. 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

43. 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

44. Object Snap44 OSNAP Overrides

45. 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.

46. 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.

47. 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

48. Object Snap48 OSNAP ON/OFF

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

50. Object Snap50 Multiple OSNAPs

51. 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 !

52. 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.

53. 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.

54. 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.

55. Object Snap55 Changing the Aperture Size

56. 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

57. 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:

58. Object Snap58 AutoSnap Settings

59. 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

60. 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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62. Object Snap62 Tracking

63. 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

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

65. 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:

66. 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

67. 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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