What is a datum line in FreeCAD?

What is a datum in FreeCAD?

In FreeCAD the word “Datum” is normally used to refer to auxiliary geometry in the PartDesign Workbench. These geometrical elements will not form part of the final Shape of the Body, but can be used as references and supports for sketches and other types of features.

What are datum line?

datum line (plural datum lines) (engineering) A line which serves as a reference or base for the measurement of other quantities.

What is a datum plane?

A datum plane is a plane on the target that is established as a datum. It can be a target’s external plane (datum plane) or center plane (datum center plane). “Datum plane” is defined as follows in ISO and ASME standards: ISO 5459 : 2011. A datum that is a theoretically exact plane.

How do I create a reference line in Freecad?

Usage

  1. Press the. Create a datum line button.
  2. Define Line parameters. …
  3. Depending on the selected reference, there may be one or more attachment modes available in the the list. …
  4. To add an additional reference, press the next Reference button. …
  5. Select an attachment mode in the list.
  6. Define Attachment Offset values.
  7. Press OK.

How do you get a body in Freecad?

Usage

  1. Press the Body button. An empty Body is created and automatically becomes active.
  2. Now you can press New sketch to create a sketch in the Body that can be used with Pad.
  3. Alternatively, add a primitive PartDesign Feature, for example, Additive box.
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What are datums used for?

Geodesists and surveyors use datums to create starting or reference points for floodplain maps, property boundaries, construction surveys, levee design, or other work requiring accurate coordinates that are consistent with one another. There are two main datums in the United States.

Why is a datum important?

A datum reference or just datum (plural: datums) is some important part of an object—such as a point, line, plane, hole, set of holes, or pair of surfaces—that serves as a reference in defining the geometry of the object and (often) in measuring aspects of the actual geometry to assess how closely they match with the …

What is an example of a datum?

An example of a datum is a new scientific discovery used to reach a conclusion about the common cold. 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.

What is the datum point?

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. ISO Definition.

How do you create a datum in Creo?

How to show the Datum Tag Reference Plane in some views and hide it in others in Creo Parametric

  1. Create a part with its drawing.
  2. Into the part create a Datum Plane, select it in model tree and Right Mouse Buton > Properties > Set Datum Tag Annotation.
  3. Go back to drawing and note that this datum tag is shown in all views.
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