stacked dimensioning standard 1

[kbtonk]

For decades I have used stacked dimension tolerances with the top dimension being the dimension the machinist comes to first. See example from attached text book. Now I have been told that ISO uses the highest dimension at the top always. Is this true? Is ISO diffrent than ANSI?

 

[pmarc]

How old is the book you are referring to? Basing on lettering direction I guess it deals with ISO dimensioning style. According to clause 6.2 of ISO 286-1:2004, limit deviations "shall be indicated by indicating the upper deviation above the lower deviation". ASME Y14.5M-1994 also does not show anywhere upper deviation being shown at the bottom.

 

[KENAT]

Per ASME Y14.5-1994 section 2.2:

(a) Limit Dimensioning. The high limit (maximum value is placed above the low limit (minimum value).

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[kbtonk]

The text book, written in 1962 referencing ASME, is what I used in junior high school drafting class. They still use dimensions with arrow heads at each end?

 

[ctopher]

I have experience with KENAT's response.
--------
"They still use dimensions with arrow heads at each end?"
When are they 'not' dimensioned with arrows at each end?

Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion

 

[kbtonk]

""They still use dimensions with arrow heads at each end?"
When are they 'not' dimensioned with arrows at each end?"

Was just a joke cuz of my advance years in the trade and not keeping up with the current trends and standards, although I've used and seen ticks, slashes, dots, etc. at the end of dimensions.

 

[ctopher]

I once saw a flower petal on the end of dim lines!

Chris
SolidWorks 10 SP4.0
ctopher's home
SolidWorks Legion

 

[dgallup]

I've seen (& worked) for a few companies that reversed the order of the dimensions based on how it was machined. I always thought that was very confusing. Most of those companies are out of business so maybe it wasn't a great idea. In those cases, the companies had their own voluminous drawing standards that didn't comply with any national or international standard.

Per ISO 406 (1987):
The upper deviation or the upper limit of size shall be written in the upper position and the lower deviation or lower limit of size in the lower position, irrespective of whether a hole or a shaft is toleranced.