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Object Snap, Geometric Constructions and Multiview Drawings

Learn how to use OSNAP and AutoSnap features for precision drawing with AutoCAD, including object snap modes and running object snaps. Explore geometric constructions and multiview drawings.

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Object Snap, Geometric Constructions and Multiview Drawings

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  1. Object Snap, Geometric Constructions and Multiview Drawings Sacramento City College EDT 310 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  2. Objectives • Use OSNAP to create precision drawings • Use object snap overrides for single point selections • Set running object snap modes for continuous use • Describe the Quick object snap mode • Adjust aperture size based on point selection needs EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  3. Objectives • Use the AutoSnap features to speed up point specifications • Use the OFFSET command to draw parallel lines and curves • Divide existing objects into equal distances using the DIVIDE command • Use the MEASURE command to set designated increments on an existing object EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  4. Objectives • Use Tracking to locate points relative to other points in a drawing • Use construction lines to assist in drawing multi-view and auxiliary views EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  5. OSNAP EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  6. OSNAP • 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  7. AutoSnap • 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  8. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  9. The Object Snap Modes • Object snap modes determine the point to which the cursor snaps. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  10. Setting Running Object Snaps EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  11. Setting Running Object Snaps • Set the running object snaps. • “Preset” object snap modes • AutoCAD automatically activates them at all point selection prompts. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  12. Setting Running Object Snaps • Set by • 1. OSNAP at Command: prompt • 2. Pick ObjectSnapSettings button from the ObjectSnap toolbar EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  13. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  14. Object Snap Modes EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  15. Object 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  16. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  17. Object Snap Modes • Center - locates the center point of a radial object, including circles, arcs, ellipses, elliptical arcs, radial solids. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  18. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  19. Object 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  20. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  21. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  22. Object 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  23. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  24. Endpoint 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  25. 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  26. Center 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  27. Quadrant 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  28. Intersection 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  29. Intersection 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  30. Apparent 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  31. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  32. Perpendicular 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  33. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  34. Perpendicular Object Snap • A deferred perpendicular means the calculation of the perpendicular point is delayed until another point is picked. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  35. Perpendicular 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  36. Tangent 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  37. Tangent 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  38. Parallel 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. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  39. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  40. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  41. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  42. EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  43. Node Object Snap • Point objects can be snapped to using the Node object snap mode. • The point must be in visible display mode EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  44. Nearest 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 EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  45. Fast Object Snaps EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  46. Using Fast Object Snaps • AutoCAD searches the entire drawing database when using OSNAP’s • On a small drawing this occurs quickly. • On a large drawing, it may require a lot of time. • You can speed up the process using the Quick Object Snap Mode EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  47. Using Fast Object Snaps • Select Quick mode by • Picking the Quick button from the Object Snap toolbar • Typing in QUI • The Quick mode directs AutoCAD to pick the first point that satisfies the object snap mode EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  48. Using Fast Object Snaps • Command: L or LINE • From point: QUI, TAN • To point: (pick a point on the first circle near the intended point of tangency) • To point:(pick a point on the second circle near the intended point of tangency) • Command: EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  49. Using the From Option • The From point selection mode allows you to establish a relative, polar coordinate or direct distance entry from a specified reference base point. • Access by: • Selecting snap from button on OSNAP toolbar • Select From in the cursor menu • type FRO at the point selection prompt EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

  50. OSNAP Overrides EDT 310 - Chapter 6 Object Snap, Geometric Constructions and Multiview Drawings

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