﻿ Introduction to Top-Down Design # Datum Features

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Datum features are created to help build the solid or surface features. In this section we will  learn about following datum features

• Datum Curves
• Datum Points
• Datum Planes
• Datum Axis
• Datum Coordinate System

## Datum Curves

In surface modeling datum curves are of great importance. Most of the surfaces are built around datum curves. So surface modeling requires good skills to build datum curves.

There are several exercises elaborating how to

• Sketch a spline
• Modify a spline
• Dimension the tangency of end points of a spline
• Dimension the tangency of an intermediate point of a spline
• Dimension radius of curvature of a spline
• Sketch a three point spline and dimension it
• Sketch a conic arc
• Create a datum curve that passes through the selected points
• Create a datum curve by projection
• Create a composite datum curve by copying multiple  curves
• Creat a curve at the intersection of two surfaces
• Wrapping a sketched curve A Spline A non-circular helical curve Curve projected around the periphery of the part

## Datum Points

In this section, there are several exercises elaborating how to create

• Sketched datum points
• Datum points at the center of an arc or circle
• A datum point that lies on a datum curve
• A datum point at a specific distance on a datum curve
• A datum point that lies on a vertex
• A datum point at the intersection of a surface and a datum axis
• A datum point that lies on a surface and dimensioned to datum planes
• A datum point offset from a surface
• Datum points offset from the coordinate system Datum Point at a specific distance Datum Point lying on a surface

## Datum Planes

In this section, there are several exercises elaborating how to create

• A datum plane that passes through a datum axis and at an angle to a specified plane
• A datum plane that passes through a datum point and normal to a datum curve
• An offset datum plane
• A datum plane that is parallel to an existing plane and passes through a datum curve. ## Datum Axis

In this section, there are several exercises elaborating how to create

• A datum axis that passes through the center of a cylindrical surface
• A datum axis that passes through the center of a circular curve.
• A datum axis that passes through a datum point and normal to a datum plane.
• A datum axis that passes through a datum point and normal to selected surface.
• A datum axis that passes through a datum point and tangent to a selected datum curve.
• A datum axis that passes through the intersection of two datum planes.  ## Datum Coordinate System

In this section, there are several exercises elaborating how to create

• A  datum coordinate system at the intersection of three datum planes.
• A datum coordinate system at the intersection of an axis and a surface.
• A datum coordinate system offset from an existing coordinate system.
• A datum coordinate system that lies at a vertex and its axis directions parallel to the default coordinate system ##### Back   Next

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