Basic Dual Dimensions

[DrawingsGuy]

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.

 

[crjones]

Look at the ASME Y14 standards on drafting.

 

[DrawingsGuy]

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

 

[doct9960]

DrawingsGuy,

have a look at thread1103-167130

 

[Heckler]

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
Sr. Mechanical Engineer
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(In reference to David Beckham) "He can't kick with his left foot, he can't tackle, he can't head the ball and he doesn't score many goals. Apart from that, he's all right." -- George Best

 

[CorBlimeyLimey]

"also, is there a way to upload files?"
faq559-1100 for images and faq559-1177 for files.


SW07-SP3

 

[drawoh]

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