# Example: Belt and pulley system

Published 2012-03-25 | Author: Jimi Oke

This simple belt-and-pulley is used as a basis for solving trigonometric problems. Although simplistic, it shows how elegant and powerful TikZ can be for mathematically precise illustrations. Diagram from Precalculus text by Stewart.

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% Belt and pulley system
% Author: Jimi Oke
\documentclass[11pt]{article}
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,positioning}
\begin{document}
\begin{tikzpicture}

% Definitions
\pgfmathsetmacro{\b}{75}
\pgfmathsetmacro{\a}{15}
\pgfmathsetmacro{\R}{2}
\pgfmathsetmacro{\r}{1}
\pgfmathsetmacro{\P}{\R*tan(\b)}
\pgfmathsetmacro{\Q}{\R/cos(\b)}
\pgfmathsetmacro{\p}{\r/tan(\a)}
\pgfmathsetmacro{\q}{\r/sin(\a)}

% Pulleys

% big pulley
\draw (0,0) circle (\R) ;
\fill[left color=gray!80, right color=gray!60, middle
color=white] (0,0) circle (\R) ;
\draw[thick, white] (0,0) circle (.8*\R);
\shade[ball color=white] (0,0) circle (.3) node[left,xshift=-5] {$P$};

% small pulley
\draw (\Q+\q-.3, 0) circle (\r);
\fill[left color=gray!80, right color=gray!60, middle
color=white] (\Q+\q-.3, 0) circle (\r) ;
\draw[thick, white] (\Q+\q-.3,0) circle (.8*\r);
\shade[ball color=white] (\Q+\q-.3,0) circle (.15)
node[right, xshift=2] {$Q$};

% belt and point labels
\begin{scope}[ultra thick]
\draw (\b:\R) arc (\b:360-\b:\R) ;
\draw (\b:\R) -- ( \P, 0 );
\draw (-\b:\R) -- ( \P, 0 );
\draw (\Q-.3,0) -- + (\a:\p)  arc (105:-105:\r) ;
\draw (\Q-.3,0) -- + (-\a:\p);
%\draw (\b:\R) arc (\b:360-\b:\r) ;
\end{scope}

\draw (0,0) -- (\b:\R) node[midway, above,sloped] {$R$} node[above] {$A$};
\draw (-\b:\R)--(0,0) ;
\draw (\Q+\q-.3,0) -- +(105:\r) node[midway,above, sloped] {$r$}
node[above] {$E$};
\draw (\Q+\q-.3,0) -- +(-105:\r) node[below] {$D$};
\node[below] at (-\b:\R) {$B$};
\node[below] at (\Q-.3,0) {$C$};

% center line
\draw[dash pattern=on5pt off3pt] (0,0) -- (\Q+\q-.3,0);

% angle label
\node[fill=white] at (0.73*\Q, 0) {$\theta$} ;
\draw (\Q-1.8,0) arc (180:195:1.5);
\draw (\Q-1.8,0) arc (180:165:1.5);
\end{tikzpicture}
\end{document}


• #1 Volker Grabsch, June 26, 2012 at 10:19 p.m.

Could anyone remove that nasty spam comment #1, please?

(When done, feel free to remove this comment here, too)

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