lecture note 3 osnap arc

TOPICS:

OBJECT SNAPS:

Or OSNAPs are a means of responding with precision to any prompt directing the user to pick a point in the drawing.

They provide the means for precisely locating and selecting a point (endpoint, midpoint, center point, etc.) on (or referenced by) any existing object in the drawing.

OSNAP is an important mode used for locking onto key locations of objects

Uses geometry to locate specific positions

When the cursor moves over a valid SNAP POINT, an OSNAP symbol appears along with a TOOLTIP telling which OSNAP Mode is being used.

OBJECT SNAP MODES:

Endpoint Snaps to the closest endpoint of an arc, elliptical arc, line, mline, polyline segment, or ray or to the closest corner of a trace, solid or 3D face.

MidpointSnaps to the midpoint of an arc, elliptical arc, line, mline, polyline segment, solid, spline, or xline.Intersection Snaps to the intersection of an arc, circle, ellipse, ellipticl arc, line, mline, polyline, ray, spline, or xline.

Extension Snaps to the extension point of an object. You can establish an extension path by moving the cursor over the endpoint of an object. A market is placed on the endpoint. While the endpoint is marked, the cursor snaps to the extension path of the endpoint.

Apparent Intersection

Apparent Intersection snaps to the apparent intersection of two objects (arc, circle, ellipse, elliptical arc, line, mline, polyline, ray, spline, or xline) that do not intersect in 3D space but appear to intersect in the drawing display.

Center Snaps to the center of an arc, circle, ellipse, or elliptical arc.Node Snaps to a point object.

Quadrant Snaps to a quadrant point of an arc, circle, ellipse, or elliptical arc.InsertionSnaps to the intersection of point of an attribute, a block, a shape, or text.Tangent Snaps to the tangent of an arc, circle, ellipse, or elliptical arc.Nearest Snaps to the nearest point on an arc, circle, ellipse, elliptical arc, line, mline, polyline, ray, solid , spline, or xline.Perpendicular Snaps to a point perpendicular to an arc, circle, ellipse, elliptical arc, line, mline, polyline, spline, or xline.Parallel Snaps to an extension in parallel with an object. When you move the cursor over the endpoint of an object, the endpoint is marked and the cursor snaps to the parallel alignment path to that object. The alignment path is calculated from the current from point of the command.None Turns off object snap modes.

HATCH

Line pattern use to fill a close area.

Types of Hatch Pattern

1. User Defined Creates a pattern if lines based on the current linetype I your drawing. You can control the angle and spacing of the lines in your user-defined pattern.

2. Predefined Specifies a stored predefined Autocad pattern. You can control the angle and scale of any stored pattern.

3. Custom Specifies a pattern that is defined in any custom. PAT file that you added to the Autocad search path

GRADIENTSolid hatch fill that gives the blended-color effect of a surface with light on it.

Arc

Creates an Arc, default direction is counterclockwise

3 point Arc

Command

: A

Specify start point of arc or [Center]

: Pick point (1st)Specify second point of arc or [Center/End]: Pick point (2nd)

Specify end point of arc

: Pick point (3rd)

**Continue Arc

Command

: Press enter


: Press enterSpecify end point of arc

: Pick any point

Start, Center, Endpoint

Command

: Select SCE (from pulldown) (DRAW)


: Pick MID ASpecify Center of arc

: Pick MID B

Specify end point of arc or [ angle/chord length]: Pick MID C

Start, Center AngleCommand

: Select SCA (from pulldown) (DRAW) Specify start point of arc or [Center]

: Pick MID DSpecify Center of arc

: Pick MID E

Specify included angle

: 90

Start, Center, Length

Command

: Select SCL (from pulldown) (DRAW)


: Pick MID FSpecify Center of arc

: Pick MID G

Specify length of chord

: CAL

Initializing>>>Expression

: sqrt (12.5)

3.53553

Start, End, Direction (Ortho On (F8) or Polar On (F10)

Command

: Select SED (from pulldown) (DRAW)


: Pick MID ISpecify End of arc

: Pick MID J

Specify tangent direction for the start point of arc: Pick k

EMBED AutoCAD.Drawing.17

Predefined

EMBED Photoshop.Image.7 \s






AUTOCAD 2007 MODULE 1 2D DRAFTING

LECTURE NOTES NO. 3

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lecture note 3 osnap arc

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