What are datum targets used for?

A datum target is a point, line, or limited zone on a target with which machines and instruments for processing, measuring, and inspection come into contact in order to establish a datum.

What is datum target in drawing?

Definition: The Datum Target Symbol is used to define a specific point, line, or area to be used in order to establish a datum on a drawing. The symbol is defined by a circle divided horizontally in half.

How do I change the datum target size in Solidworks?

To move the datum target symbol (the balloon or the point), select the symbol and drag the item. To edit the datum target symbol, select the symbol. You can use reference dimensions, model dimensions, and vertex inferences to locate datum targets in both drawings and sketches.

How many datum targets are there?

three datum targets
The primary datum has three datum targets, the secondary two and the tertiary one.

What is the difference between a datum target and a datum feature?

The datum is an imaginary but theoretically perfect surface, line, or points. A datum feature, on the other hand, is the physical representation of datum. Datum targets are specified regions of the datum feature used for locating the part in a fixture.

When basic dimensions are used on datum targets?

Basic dimensions of 15 and 30 are used to locate the true position of the holes from Datum Features B and C. We know that these are basic (thus, perfect) dimensions because this is indicated by the dimensions having a box around them.

What are the 3 types of datum targets?

Another example of a three-plane datum system is by the use of datum targets. The datum target is either a point, line or area on a workpiece. The datum target is to be the place of contact (supports of the workpiece) for the manufacturing and inspection equipment.

What is a datum feature in Solidworks?

You can attach a datum feature symbol to the following items: In a part or assembly, on a planar model surface or on a reference plane. In a drawing view, on a surface that appears as an edge (including silhouette edges) or on a section view surface to identify datum planes in the part.

How do you use datums?

Datums are indicated using the following symbols (datum symbols). Datum symbols use either a white or black triangle. The letters indicating the datums are always oriented to the direction the reader looks at the drawing. The position of the datum symbol on the drawing is also relevant to the target area.

What type of dimensions are used to locate datum targets and why is that type used?

2: “The location and size, where applicable, of datum targets are defined with either basic or toleranced dimensions. If defined with basic dimensions, established tooling or gaging tolerances apply.” Thus, most GD people use basic dimensions to locate datum targets.

What are datum Features?

A datum feature is a part feature (or FOS), that contacts a datum during measurement. A datum is a theoretically exact plane (or axis or center-plane), from which dimensional measurement should be made.