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Basic Dual Dimensions

Basic Dual Dimensions

Basic Dual Dimensions

(OP)
Hi All,
I am new to this forum but had a question if any of you know what a Basic dual dimension should look like or if there is a standard that depicts this.

Thanks,
Marc

also, is there a way to upload files?  That would help you to understand more what i am asking.

RE: Basic Dual Dimensions

Look at the ASME Y14 standards on drafting.

RE: Basic Dual Dimensions

(OP)
thank you but I have ASME 14.5 and caoont find anything in it referring to this.

RE: Basic Dual Dimensions

ASME Y14.5M-1994

Section 1.3.9 Basic Dimension - A numerical values used to describe the theorectically exact size, profile, orientation or location of a feature or datum target.

Section 1.3.10 Reference Dimension - A dimension, usually without tolerance, used for information purpose only.  A reference dimension is a repeat of a dimension or is derived from other values shown on the drawing or  on related drawings.  It is considered auxiliary information and does not govern production or inspection operations.


I think your key answer is in the word derived.  The dual dimension is derived from the primary dimension that happens to be basic.

Heckler
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RE: Basic Dual Dimensions

DrawingsGuy,

   A basic dual dimension sounds to me like a mistake.  I provide alternate units for reference only.  Only the official dimension can be basic.

   Check out the Drafting Standards, GD&T & Tolerance Analysis forum.

                        JHG

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