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A reference dimension is a dimension that is not crucial for the effective use of the part. Reference dimensions are not inspected.
A reference dimension may also be a dimension that is shown elsewhere in the drawing but is shown in the current view to help clarify the position of other features in the view. This practice eliminates "double-dimensioning" which is not acceptable in drafting standards.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoA reference dimension is commonly shown in paranthesis after the dimension i.e. 15'-0" (REF.)
A more common way, according to ANSI/ASME for mechanical drafting, is to simply put parenthesis AROUND the dimension itself [e.g. (Ø2.750)] This eliminates the need to understand the English abbreviation for "reference". The fewer words on a drawing, the better. Hence, the creation of all of the symbols that are used in drafting.
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What is 3d modeling?
3D modeling is modeling in three dimensions. drawing a picture on a piece of paper is 2D- the dimesions are up/down (height) and left/right (width). In 3D modeling the additional dimension forth/back (depth) is added, like in sculpting. Think of 3d modeling as sculpting on a computer.
What is the scale and why scale must be considered when the draughtman drawing the plan?
Scale is how much smaller(or bigger) the drawing is compared to the real object. It'd be real awkward if you were drawing a house to have to make the drawing as big as the house would be. But for the drawing to work out you need to know how to translate between the drawing and reality - so you decide something. Scale 1:12 for instance would mean that something that's one inch in the drawing would be one foot in reality.
Whats the purpose of a component range drawing?
whats the purpose of a compoent range drawing
Why is the placment of your dimension important?
because we have to know the measurement and the lengtth
What does drawing inferences mean?
Drawing Inferences means showing and sensing relationships which are not written in the text but are implied by the writer.
Can a reference dimension on an Engineering drawing be toleranced?
No, then it would not be a reference dimension. Reference dimensions by definition have no tolerance.
How is a material in stock dimension shown on a drawing?
.125 STOCK
What does for reference only mean on an engineering drawing?
It means you can't look at it or you'll go catatonic Cute. Actually, it means that the entity that is being "referenced", usually a dimension, should NOT be inspected. It might be an overall length of the part. This might be a "cut length" for the machinist where the actual required dimension is shown elsewhere on the drawing.
On a manufacturing drawing what does it mean to hold dimension?
Every dimension has a shown or implied tolerance, the dimensions shown as HOLD are the dimensions that are not to be affected by the stack up of tolerances of the holes or features around them.
The first dimension string on an architectural drawing should begin were?
The first dimension string on an architectural drawing should begin at the point representing the starting reference point of the dimension being measured. This point is typically indicated by a small arrow or dot.
What does a dimension in brackets on a drawing?
This is a reference dimension. I.e. the part can and should be manufactured without using it directly. The non-bracketed dimensions should define the form of the part completely.
What is the difference between shown in drawing and shown on drawing?
Shown in drawing and shown on drawing can mean the same thing. These statements would both indicate that the concept is shown somewhere within the drawing.
What is the definition for datum dimension?
A dimension that exactly locates a reference point, reference line, or reference plane
What do parentheses around a dimension represent?
Generally it means that the dimension is for reference only. The actual (real dimension) will show up somewhere else on a drawing. It could also be put on a dimension that you really don't want an inspector to hold tight (material thicknesses that vary with vendor or batch run)
What does an underlined dimension mean on a drawing?
An underline on a dimension means that it is not to scale.
Dimension not to scale representation in engineering drawing?
NTS
Difference between reference dimension and basic dimension?
Basic dimension is the numerical value defining the theoretically exact size of a feature. Reference dimension is the numerical value enclosed in parentheses provided for information only and is not used in the fabrication of the part.
