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  <div class="section" id="basics">
<h1>Basics<a class="headerlink" href="#basics" title="Permalink to this headline">¶</a></h1>
<div class="section" id="source-files">
<h2>Source Files<a class="headerlink" href="#source-files" title="Permalink to this headline">¶</a></h2>
<p>Supported source files are:</p>
<ul class="simple">
<li><strong>Gerber</strong>: Typically define copper layers in a circuit board.</li>
<li><strong>Excellon</strong>: (drill file): Contain drill specifications, size and coordinates.</li>
<li><strong>G-Code</strong>: CNC machine instructions for cutting and/or drilling.</li>
</ul>
<p>These source files can be loaded by selecting File→Open Gerber…, File→Open Excellon… or File→Open G-Code… respectively. The objects created from source files are automatically added to the current project when loaded.</p>
</div>
<div class="section" id="objects-and-tasks">
<h2>Objects and Tasks<a class="headerlink" href="#objects-and-tasks" title="Permalink to this headline">¶</a></h2>
<p>Data in FlatCAM is in the form of 4 different kinds of objects: Gerber, Excellon, Geometry and CNC Job. Gerber, Excellon and CNC Jos objects are directly created by reading files in Gerber, Excellon and G-Code formats. Geometry objects are an intermediate step available to manipulate data. The diagram bellow illustrates the relationship between files and objects. The arrows connecting objects represent a sub-set of the tasks that can be performed in FlatCAM.</p>
<img alt="_images/objects_flow.png" class="align-center" src="_images/objects_flow.png" />
</div>
<div class="section" id="creating-saving-and-loading-projects">
<h2>Creating, Saving and Loading Projects<a class="headerlink" href="#creating-saving-and-loading-projects" title="Permalink to this headline">¶</a></h2>
<p>A project is everything that you have loaded, created and set inside the program. A new project is created every time you load the program or run File→New.</p>
<p>By running File→Save Project, File→Save Project As… or File→Save a Project Copy… you are saving everything currently in the environment including project options. File→Open Project… lets you load a saved project.</p>
</div>
<div class="section" id="navigating-plots">
<h2>Navigating Plots<a class="headerlink" href="#navigating-plots" title="Permalink to this headline">¶</a></h2>
<p>Plots for open objects (Gerber, drills, g-code, etc…) are automatically shown on screen. A plot for a given can be updated by clicking “Update Plot” in the “Selected” tab, in case any parameters that would have changed the plot have been modified.</p>
<p>Zooming plots in and out is accomplished by clicking on the plot and using the mouse <strong>scroll wheel</strong> or hitting one of the following keys:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">1</span></tt>: Fits all graphics to the available plotting area.</li>
<li><tt class="docutils literal"><span class="pre">2</span></tt>: Zooms out</li>
<li><tt class="docutils literal"><span class="pre">3</span></tt>: Zooms in</li>
</ul>
<p>When zooming in or out, the point under the cursor stays at the same location.</p>
<p>To scroll left-right or up-down, hold the <tt class="docutils literal"><span class="pre">shift</span></tt> or <tt class="docutils literal"><span class="pre">control</span></tt> key respectively while turning the mouse <strong>scroll wheel</strong>.</p>
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