Re: Tolerance in text

["Gene Kim-Eng" <techwr -at- genek -dot- com>]

Point 1:
There is no difference in meaning between the two examples
you cite.  In most engineering drawings the ± symbol is used
when the tolerances are identical, with +/- used to separate
differenct tolerances.

There is no such thing as an "implied tolerance."  If the engineering
drawing or manufacturing instructions do not specify a default
tolerance to be applied to numbers that do not have a tolerance
attached to them, they are in error.

Point 2:
It is not necessary to specify units for both the measurement
and the tolerance.  If you do choose to do this, make sure you
do it consistently throughout the document.

Gene Kim-Eng


----- Original Message ----- 
From: "Links, Diederik" <D -dot- Links -at- hde -dot- nl>

I _obviously_ prefer the first one.
Because the '±'-sign means 'approximately' (the hole can be 24 mm or 26 mm) 
and not 'plus or minus' (the hole must be between 24.8 mm and 25.2 mm).


--------
Point 2:
--------
What notation is correct or more, preferrable:
A. "Drill a hole with a diameter of 25 +/-0.2 mm."
"Drill a hole with a diameter of 25 mm +/-0.2 mm."

B. "Drill a hole with a diameter of 25 +0.2/0.5 mm."
"Drill a hole with a diameter of 25 +0.2 mm/0.5 mm."

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