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From: claus@suncvt13.verfahrenstechnik.uni-stuttgart.de (Claus Fleischer)
Newsgroups: comp.text.tex
Subject: Re: Getting rid of underfull hbox
Message-ID: <365@rusux1.rus.uni-stuttgart.de>
Date: 5 Dec 90 17:28:34 GMT
References: <503.2759C7E2@bberry.uucp>
Sender: zrf80385@rusux1.rus.uni-stuttgart.de
Organization: ICVT
Lines: 22

In article <503.2759C7E2@bberry.uucp> Pieter.Muller@f11.n492.z5.fidonet.org (Pieter Muller) writes:
>
>I use the following as part of a command to generate boxed headings in a technical manual:
>
>        \vspace{.5cm} \noindent
>        \framebox[\textwidth][l]{{\bf #1}}
>
>
>For each instantiation of this command I get the warning:
>
>Underfull \hbox (badness 10000) in paragraph at lines 483--483
>

I would try the following

   \framebox[\textwidth][l]{{\hfill \bf #1 \hfill}}

so you get an infinitely stretchable space at the beginning and
the end of your #1 and should therefore not produce an
"underfull \hbox" warning at all.

claus