tools are available from the Object Snap toolbar ( View -
Toolbars to enable). They allow for precise drawing within
Autocad. For example, a rectangle could be drawn from the
exact endpoint of an existing line by simply selecting the
'Snap to Endpoint' tool, or we could draw a line from the
centrepoint of a circle using the 'Snap to Center' tool. In
many cases, object snap avoids the need to draw construction
lines, thus making it quicker and easier to create precise,
The first point of the Rectangle above was drawn from the
Endpoint of the 45 degree line.
The object snap
tools can be used whenever a point has to be defined, which
is in nearly every drawing command used! When we use the
snap tools, a yellow marker will appear when the cursor is
near a suitable snap point. A single left click of the mouse
will automatically select the marked point.
From left to
right on the above toolbar screen shot (Note: Dependant on
your version of Autocad, some snap settings may not be
Snap to Endpoint - This will select the
endpoint of any line or polyline segment. Also works on
'closed' objects such as rectangles.
Snap to Midpoint - Very
handy tool. This will select the mid-point of any line
Snap to Intersection - Selects the exact
point at which two lines cross.
Snap to Apparent Intersection - Similar to
above, although the lines don't have to intersect. This snap
requires you to select a line, then hover the cursor over
any other line, the marker will let you select the point
where the two lines would intersect if they were extended.
Snap to Extension - This snap tool enables
you to select a point along the same orientation as an
existing line, with a handy readout of the angle and
position of the point (See screen shot below).
Snap to Center - This handy snap function
selects the perfect centre of an existing circle. Even more
impressive however is that the centurion of an arc or
semi-circle can also be selected.
Snap to Quadrant - Snap to the four quadrant
points of a circle (Top, bottom, left and right).
Snap to Tangent - As it says, snaps to the
tangent point of an arc.
Snap to Perpendicular - Snaps to the the
perpendicular point on an object from the original start
point. Pretty straightforward, and very useful.
Snap to Parallel - Snaps parallel to a
Snap to Insert - Snaps to the insert point
of an object, such as an inserted block. Not really that
Snap to Node - Snaps to points drawn using
Snap to Nearest - Should be called snap to
anything! Quite literally will snap to anywhere along any
length of any object. Can be useful though while 'sketching'
with Autocad, or perhaps laying down a few construction
Object snap settings - Snap settings.
Object snap can
be toggled to be permanently on or off via the OSNAP tab
situated to the bottom of the CAD window above the Windows
start menu. Alternatively simply press F3 to toggle.
To change which
snap functions are to be used, either right click the OSNAP
tab and select 'settings', or select the object snap
settings button from the Object Snap toolbar.
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