Ruling Dimension

[Cool Breeze]

Please could someone offer guidance/ explanation on the "Ruling Dimesnsion" notation on a technical drawing.
For example, the drawing for a machined metallic detail approximately 6mm thick calls for a ruling dimension of 8mm.

I believe that it notates the maximum thickness of the starting material so as to ensure the material properties are consistent throughout the machined parts.

Thanks in advance

 

[ctopher]

I have never heard of that on a drawing. Can you share a pic of the detail?

Chris, CSWP
SolidWorks
ctophers home

 

[Cool Breeze]

Can't show drawing I am afraid but after some further research, I believe it also known as Ruling Section.

 

[mfgenggear]

Dam can't wait for this correct answer.
Can the author be contacted maybe world War 2 erra
How old is the drawing

 

[JohnRBaker]

I found this definition of a 'ruling section':

https://www.engnetglobal.com/tips/glossary.aspx?word=Ruling+Section

John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[Cool Breeze]

Thanks JohnRBaker

I think I am on the right track, it was some time ago, but I vaguely remembered!