A Datum is a perfect point, line, plane or surface but only exists theoretically. However a Datum Feature is a
tangible surface, point or axis
on a part where that theoretical datum is located.
What can be a datum feature?
A datum feature can be
a plane, line, or point
—these are selectively used depending on the tolerance and feature you need to specify.
What is the difference between a datum and a datum feature * 1 point a datum and datum feature are synonymous A datum is theoretical a datum feature is real a datum is a feature of size and a datum feature is a surface feature a datum feature is theoretical and a datum is real?
A Datum Feature is a feature on a physical part that is used to reference other features. The ASME Y14. … Note that a datum feature is different from a datum, which refers to an intangible, theoretical feature with perfect form. When referring to a datum feature on a part or drawing, “datum feature” is the proper term.
How do you define datum?
A datum is a plane, a straight line, or a point that is used as a
reference when processing a material or measuring the dimensions of a target
.
What is datum feature reference?
In engineering and drafting, a datum is
a reference point, surface, or axis on an object against which measurements are made
. These are then referred to by one or more ‘datum references’ which indicate measurements that should be made with respect to the corresponding datum feature .
What are the types of datum?
There are two main datums in the United States.
Horizontal datums measure positions
(latitude and longitude) on the surface of the Earth, while vertical datums are used to measure land elevations and water depths.
Can a surface be a datum?
Datum Features ≠ Datums
A Datum is a perfect point, line, plane
or surface but only exists theoretically
. However a Datum Feature is a tangible surface, point or axis on a part where that theoretical datum is located.
Can a datum feature reference itself?
RE: Can a Datum feature reference itself in Y14.
You could give each dimension (width and length) its own positional tolerance.
No difference
. Completely legal, just not common.
What is a datum target symbol?
Datum target symbols
The symbol for a datum target is
a circle divided by a horizontal line
(see Fig. 22.36). The lower part identifies the datum target. The upper area may be used only for information relating to datum target.
What is datum in design?
Datum: A datum is
a form which ties together or anchors all other elements of the design
. It can be a line, like a road with houses arranged along its length, a flat plane, or even a 3D space. Many buildings all share a plane which acts as a clear datum— it’s the ground on which they are built!
What is an example of datum?
An example of a datum is
the assumed altitude of a specific piece of land used as the basis in calculating the altitude of the top of a mountain on the land
. … The singular form of data; for example, one datum. It is rarely used, and data, its plural form, is commonly used for both singular and plural.
What is another word for datum?
| detail particular | point specific | fact nicety | particularity data point | item element |
|---|
How do I create a datum point?
Creating a datum point by
projecting a point onto a face
. Select a point on the model and an edge or datum axis on which to project the point. Abaqus/CAE creates the datum point where the edge or datum axis intersects a line that is normal to it and passing through the selected point, as shown in Figure 7.
How do I choose a datum?
Datums are important and care
must be taken when selecting
them. They must be easily identifiable on the part. When parts are symmetrical or have identical features that make identification of Datum Features difficult, the Datum Features should be physically identified.
What is a datum in GIS?
While a spheroid approximates the shape of the earth, a datum
defines the position of the spheroid relative to the center of the earth
. A datum provides a frame of reference for measuring locations on the surface of the earth. It defines the origin and orientation of latitude and longitude lines.
What is the most commonly used datum plane?
The North American Datum of 1983 (NAD 83)
is the most current datum being used in North America. It provides latitude and longitude and some height information using the reference ellipsoid GRS80.
