A while ago I need to create a nomenclature with a "=" separator for aiaa paper. I got my answer here. This worked well, until I tried to seperate the nomenclature into two groups. The result I got was this:
I would like to get rid of the separator in the group title.
And here is my MWE
\documentclass[english]{article}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage{nomencl}
% the following is useful when we have the old nomencl.sty package
\providecommand{\printnomenclature}{\printglossary}
\providecommand{\makenomenclature}{\makeglossary}
\makenomenclature
\makeatletter
\renewcommand{\nomlabel}[1]{#1\hfill\hspace{\labelsep}$=$}
\newlength{\nomwidest}
\RequirePackage{ifthen}
\renewcommand{\nomgroup}[1]{%
\ifthenelse{\equal{#1}{S}}{\item[\textbf{Symbols}]}{
\ifthenelse{\equal{#1}{A}}{\item[\textbf{Acronyms}]}{}}}
\makeatother
\usepackage{babel}
\begin{document}
\settowidth{\nomwidest}{\nomlabel{that other one}}
\printnomenclature[\nomwidest]
\nomenclature[ATO]{TO}{this one}\nomenclature[ATOO]{TOO}{that other one}\nomenclature[Sa]{$\alpha$}{alpha}\nomenclature[Sb]{$\beta$}{beta}
\end{document}


\nomwidestsets the space left of the "=" so that all seperators are aligned. – Elad Den Apr 24 '16 at 16:54