Insert
Datum Plane 
Insert
Datum (Part Level)
Use this command to insert a new datum plane.
Datums are
used to establish a plane of reference. When a sketch is created, you
are prompted to select an insertion plane. When you select a datum plane
or planar face, the sketch is aligned with the plane and sketch geometry
is created on the plane. The sketch is parametrically related to the plane
on which it is created.
This command can be used within the context of an assembly. Whenever you are prompted to select geometry, you can select from the active part or from another component in the assembly or sub-assembly. This command supports a variety of methods and options (see above) for defining datum planes.
Select reference geometry. You can select a curve, edge, face or another datum plane in the active part or from another component in an assembly or sub-assembly. Continue the operational sequence for each method below.
If a curve or edge is selected, no additional input is required. The datum plane will be normal to the curve/edge at the selected point.
Middle-click to create the datum plane.

If a face is selected, no additional input is required. The datum plane will be tangent to the face at the selected point.
Middle-click to create the datum plane.

Referencing another Datum Plane
If another datum plane is selected, select the plane's origin or middle-click to locate it at the origin of the selected datum plane.
Middle-click to create the datum plane.
|
Plane Located at Point |
Plane Parallel to a Datum Plane |
The datum plane will pass through 3 points. The orientation of the plane's axes can be further controlled using the available options (see below).
Select a point to locate the origin of the datum plane.
Select two additional points to define the x and y axis respectively.
Middle-click to create the datum plane.

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This specifies the type of reference geometry. Different datum plane creation methods are used based on the type of reference geometry selected.
Plane - Select a curve, edge, face or a datum plane other than the default datum planes. Use one of the options below for referencing one of the default datum planes.
3 point - Create a datum by specifying 3 points. An example is shown above.
XY plane - Reference the default XY datum plane.
XZ plane - Reference the default XZ datum plane.
YZ plane - Reference the default YZ datum plane.


Geometry
Use this to define (or redefine) the geometry to reference.
Origin, X point, Y point
For the 3 point method above, select the origin, X, and Y points to define the datum plane.
Offset
For the XY, XZ and YZ plane methods above, specify the amount to offset the new datum plane from the default datum plane.
Offset
For the Plane and 3 point methods above, use this option to specify the amount to offset the new datum plane from the target geometry.
Origin
Use this option to specify an alternate datum plane origin. If the reference geometry selected is a face or curve/edge, then this point will be projected onto the geometry and the new datum plane will be tangent at this point. If this option is not used, then the datum plane is tangent at the point where the face or curve/edge was originally selected.
X Point
Use this option to select a point that will determine
the direction of the x axis of the new datum plane. The z
axis is fixed by the normal vector of the selected geometry or the z
axis of a selected datum plane. If
this option is not used, then the x axis is specified as parallel to the
U direction of the curve, edge or face at the selected point.
Angle X, Y, Z 
Use these options to specify the new datum plane's angle of rotation about its X, Y and Z axis individually.
Offset
datums create
associated locating dimensions. Pick Toggle Dimensions
from the Tool Bar to display the dimension. You
can modify the location of the datum plane by editing the dimension.
You can use the
Edit Attributes command to change the display attributes
of datum planes. Set
the Pick Filter to Datum
Planes, execute this command and then select the datum plane(s)
to edit. The
Line Attributes Form will display and changes will
be applied to the selected datum plane(s).