Hai ragione, eccoti un po’ di codice (mancano i 3 simboli!):
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\newcommand*{\attenzione}[1]{%
\begin{table}[htbp]
\centering
\begin{tabular}{|m{60pt}|m{10cm}|}
\hline
\vspace*{.8ex}
\includegraphics[width=60pt]{Segnali_Sicurezza/attenzione.eps} &
\large{\textbf{#1}}\\
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\newcommand*{\mano}[1]{%
\begin{table}[htbp]
\centering
\begin{tabular}{|m{60pt}|m{10cm}|}
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\vspace*{.8ex}
\includegraphics[width=60pt]{Segnali_Sicurezza/mano.eps} &
\large{\textbf{#1}}\\
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\usepackage[english]{babel}
\begin{document}
\frontmatter
\tableofcontents
\listoftables
\listoffigures
\mainmatter
\section{Magnet}
\label{sec:Magnet}
\subsection{Description}
\label{sec:MagnetDescription}
The magnet is a magnetic block able to fix the metallic part passing under it if the distance is magnetic field in the area is strong enough to capture metallic parts and/or metallic parts are not so heavy
\subsection{Technical Specifications}
\label{sec:MagnetTechnicalSpecifications}
%Inserire una figura con le dimensioni per il cassone
\begin{table}[htbp]
\centering
\begin{tabular} {|c|c|c|}
\hline
\textbf{} & \textbf{Value} & \textbf{Unit}\\
\hline
\textbf{ Dimensions} & 500 x 350 x 500 & mm\\
\hline
\textbf{Weight } & 80 & kg\\
\hline
\textbf{Force} & 2 & N\\
\hline
\end{tabular}
\caption{Magnet Technical Specification}
\label{tab:MagnetTechnicalSpecification}
\end{table}
\subsection{Transport and Handling}
\label{sec:MagnetTransportandHandling}
For a safe transportation and handling, please refer to detailed Constructor manual.
\attenzione{Heavy block}
\sollevamento{Identify the handling points}
\subsection{Installation}
\label{sec:MagnetInstallation}
If *** Impianti is the supplier of the Box Feeder, prior to receiving the equipment the customer will be furnished with a general arrangement drawing of your equipment layout provided by ***, which includes all pertinent elevations and
dimensions. This drawing shows the configuration of he conveyor and location of the support
points if we are to supply conveyor supports. Because of varying soil conditions, *** does not
specify foundation sizes for the equipment.\\
\sollevamento{Identify the Gravity Take-up Section}
Once the equipment is received, the installation team has to identify the Gravity Take-up Section and all necessary precautions have be taken in order to assure against injury and damage. \\
Once installed, the start-up procedure must be performed before continuous usage.
\subsection {Start Up}
\label{sec:MagnetStartUp}
Once the magnet is fixed and the distance between magnet and belt is calibrated the start-up procedure can be performed.\\
Start-up procedure:
\begin{enumerate}
\item Start box feeder
\item put some metallic parts (100g) in the fuel
\item Verify that this metallic part is captured by magnet
\item If yes $\Rightarrow$ procedure successfully completed
\item If not $\Rightarrow$ optimize distance between belt and magnet
\item If distance to low and metallic part not captured $\Rightarrow$ change the magnet with a stronger one and repeat the procedure.
\item Confirm proper working
\end{enumerate}
\subsection{Use and Calibration}
\label{sec:MagnetUseandCalibration}
The distance between magnet and running belt has to respect the magnet constructor instructions.\\
Once start-up procedure is successfully performed, the magnet needs only perodcally checks. Go to \ref{sec:Magnet_Maintenances}
\subsubsection{Improper use}
If the bigger magnet surface is not parallel to the feeding belt, that means that it is mounted in a improper way.
\mano{Verify your mounting position with the suggest one in the constructor's manual}
If the bigger magnet surface is mounted with a variable distance to the feeding belt, that means that it is mounted in a improper way.
\mano{Verify your fixing points}
\subsubsection{Misuse}
If the distance between the biggest surface of magnet and the feeding belt s too high to not let metal be captured, that is a misuse, and metallic part can reach fuel handling machineries and/or burner.\\
If the distance between the biggest surface of magnet and the feeding belt s too low to not let fuel falling into the chursher (if any), that is a misuse, and fuel cannot reach burners and they will stop.
\mano{Verify that the calibrated fuel amount is falling into the chursher (if any)}
\subsection{Maintenances}
\label{sec:Magnet_Maintenances}
\attenzione {Stop all moving machinery and isolate electrical power before starting maintenance}
\attenzione {Don't restart the belt during maintenance}
\begin{table}[htbp]
\centering
\begin{tabular} {|p{5cm}|p{1.5cm}|p{7cm}|}
\hline
\rule{0mm}{0.5cm}
\large{\textbf{Item}} & \large{\textbf{Hours}} & \large{\textbf{Maintenance}} \\
\hline
Metallic parts & 200 & Remove all the captured metallic parts. \\
\hline
Distance & 200 & Check the distance. \\
\hline
\end{tabular}
\caption{Magnet Maintenance}
\label{tab:MagnetMaintenance}
\end{table}
\newpage
\subsection{Dismantling}
\label{sec:MagnetDismantling}
\attenzione{Stop the box feeder and isolate electrical power before stareting dismantling}
\sollevamento{Identify the fixing points}
Fix the magnet before starting dismantling and follow the given procedure.
\newpage
\subsection{Problems and Solutions}
\label{sec:MagnetProblemsAndSolutions}
In the table \ref{tab:MagnetProblemsandSolutions} possible magnet failures or improper performance are listed. Please consider such a table not complete.
\begin{table}[htbp]
\centering
\begin{tabular} {|p{4.5cm}|p{4.5cm}|p{4.5cm}|}
\hline
\large{\textbf{Problem}} & \large{\textbf{Cause}} & \large{\textbf{Remedy}} \\
\hline
\multirow{3}{*}{\textbf{The magnet doesn't capture}} & too much distance & reduce distance between belt and magnet \\ \cline{2-1} \cline{3-1}
& too much captured material & remove captured material \\ \cline{2-2} \cline{3-2}
& magnet field too low & change the magnet\\ \cline{2-3} \cline{3-3}
\hline
\end{tabular}
\caption{Magnet Problems and Solutions}
\label{tab:MagnetProblemsandSolutions}
\end{table}
\subsection{Annex}
\label{sec:MagnetAnnex}
For details, refer to constructor instruction (if provided).
\end{document}`