AutoCAD OSNAP Command

OSNAP is a abbreviation of object snap which specifies a snap point at an exact location on an object. You can use an object snap once in the middle of a command, or you can set running object snaps. Running object snap modes can be toggled on and off with the Osnap button on the status bar. You can use the TAB key to cycle through available object snaps. Object snap settings are stored with the drawing.

Object snap is very useful when drawing precise objects for example if you are drawing a simple slot or top view of a donut cut in half, you have to connect two arcs with two lines. First you have to draw two circles. Then connect the two circles with lines on the upper and lower quadrant (See Fig. 1). The object snap mode used here is “quadrant” which precisely draw a line on the lower and upper quadrant of the circle.

    autocad polyline icon

Fig. 1 OSNAP mode using quadrant

To make a demo, on the osnap command, start drawing two identical circles as shown above. Then start making the line by typing “line” on the command prompt. Then press the “shift” key button and right click your mouse while holding the shift key. A pop up window will appear then select “quadrant” from the menu. Then place your cursor on the circle and point it on the lower quadrant. A yellow icon diamond shape (See sample on Fig. 1) will appear which is an indicator that you should click your left mouse button to start the line. Left click your mouse then drag your cursor on the other circle on the right and do again the pressing of shif t key and right mouse click then click again if you saw the yellow diamond icon. Then press “enter” to terminate the line. Do the same thing on the upper portion of your drawing.

There are other osnap command available and have specific uses. See below:

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.

MIDpoint

Snaps to the midpoint of an arc, ellipse, elliptical arc, line, mline, polyline segment, solid, spline, or xline.

INTersection

Snaps to the intersection of an arc, circle, ellipse, elliptical arc, line, mline, polyline, ray, spline, or xline.
NOTE You may get varying results if you have both Intersection and Apparent Intersection on at the same time.

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 marker is placed on the endpoint. While the endpoint is marked, the cursor snaps to the extension path of the endpoint.

APParent Intersection

Apparent Intersection includes two separate snap modes: Apparent Intersection and Extended Apparent Intersection. You can also locate Intersection and Extended Intersection snap points while running Apparent Intersection object snap mode.
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. Extended Apparent Intersection snaps to the imaginary intersection of two objects that would appear to intersect if the objects were extended along their natural paths.

NOTE You may get varying results if you have both Intersection and Apparent Intersection on at the same time. Apparent and Extended Apparent Intersection recognize edges of regions and curves but not edges or corners of 3D solids.

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.

INSertion

Snaps to the insertion point of an attribute, a block, a shape, or text.

PERpendicular

Snaps to a point perpendicular to an arc, circle, ellipse, elliptical arc, line, mline, polyline, ray, solid, spline, or xline.

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, point, 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.

QUIck

Snaps to the first snap point found. Quick must be used in conjunction with other object snap modes.

NONe

Turns off object snap modes.

How to Configure OSNAP Setting

You can also set the osnap command running in all your drafting work so you don’t have to press “shift” key all the time and right mouse click. To set the OSNAP setting first click the OSNAP setting icon (see Fig. 2) or press “shift” key and right mouse click and select OSNAP setting. A pop-up drafting settings window will appear (see Fig. 3) .  Check the box of Object Snap On (F3) and select check box of the object snap modes you wish to use.

    autocad polyline icon

Fig. 2 OSNAP Setting Icon

    autocad polyline icon

Fig. 3 OSNAP Setting Window

3 comments ↓

#1 Chandanmal Jain on 07.29.09 at 8:04 pm

It is good example for biginners of autocad.

#2 kuysothea on 10.21.10 at 7:45 pm

how to use snap endpoint?

#3 karthik on 09.26.16 at 10:04 pm

How to use osanp commands?with an explain to best example.

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