What does REF mean on blueprints?

REF on drawings is generally defined as REFERENCE. These dimensions are to be used as reference only.

How do you show reference dimensions?

Reference dimensions are shown on a drawing as a value enclosed in parentheses. An alternate method is to follow the dimension with “Reference” or “Ref”. The use of “Ref” or enclosing the dimension inside parentheses are by far the most common notations used.

What is the difference between a basic dimension and a reference dimension?

Basic dimensions are associated with another tolerance or dimension. While they don’t have a tolerance tied to themselves, they are used to calculate another toleranced feature such as the true position of a hole. Reference dimensions are simply placed on a drawing or blueprint for reference.

What is the symbol for reference dimension?

The parameter symbol for reference dimensions is rd# (or rsd# in the case of Sketcher).

Can you tolerance a reference dimension?

A (ref) dimension has no tolerance, so it would be impossible for it to be non-conforming.

What is typical dimension?

The term “typical,” when associated with a dimension or feature, means that this dimension or feature applies to the locations that appear to be identical in the size and configuration. The tolerance stated for a dimension labeled “typical” also applies to each identical feature.

What is a basic dimension used for?

In Geometric dimensioning and tolerancing, basic dimensions are defined as a numerical value used to describe the theoretically exact size, profile, orientation or location of a feature or datum target.

What does it mean when a dimension is in a box?

Because basic dimensions are theoretically perfect dimensions, there are no tolerances associated with them. A basic dimension is noted as a dimension with a box around it and must mathematically relate back to the Datum Features. In ISO standards, basic dimensions are called TEDs – Theoretically Exact Dimensions.

What are location dimensions?

[lō′kā·shən də′men·chən] (design engineering) A dimension which specifies the position or distance relationship of one feature of an object with respect to another.

Which line types do not ever have arrowheads?

Dimensions generally take the form of: linear dimensions, angular dimensions, and notes. Which line type does not ever have arrowheads? Extension.

What does 2x mean in blueprints?

Typical on an engineering drawing identifies a repeated feature. This is identical to a feature which is identified as 2x or 5x. A typical dimension callout will occasionally be followed by a 2x, 5x or similar, to specify the quantity of features which are tolerance the same.

What is a reference dimension?

Reference dimensions are simply placed on a drawing or blueprint for reference. They have no tolerance associated with them. No matter how far off the given value a reference dimension is, it would never be cause for rejection.

What is the difference between Typ and ref dimensions on drawings?

Re: TYP and REF.dimension definition on drawings. TYP on drawings is generally defined as TYPICAL. This is often used when there are similar features, and to avoid unnecessary dimensioning by the draftsperson. REF on drawings is generally defined as REFERENCE. These dimensions are to be used as reference only. Hope this info helps. Take Care.

What is the meaning of ref on drawing?

This is often used when there are similar features, and to avoid unnecessary dimensioning by the draftsperson. REF on drawings is generally defined as REFERENCE. These dimensions are to be used as reference only. Hope this info helps.

What is a reference dimension in GD?

GD Training Definitions Reference Dimension- A dimension, usually without tolerance that is used for information purposes only. It does not govern production or inspection operations. A reference dimension is a repeat of a dimension or is derived from other values on the drawing or related drawings.

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