Tolerance in text

Subject: Tolerance in text
From: "Links, Diederik" <D -dot- Links -at- hde -dot- nl>
To: <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Tue, 21 Feb 2006 14:35:57 +0100

Hi All,

I have a few questions about measure tolerances wrote in text.

Point 1:
What is the best way to write a measure with tolerance - where both '+' and '-' are equal - in a text (or non-technical illustration)?

I normally write:
"Drill a hole with a diameter of 25 +/-0.2 mm."
My colleque writes:
"Drill a hole with a diameter of 25 ±0.2 mm."

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."

Thanks in advance for the advice.

Diederik Links

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