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2D Adaptive clearing is a milling process that removes the bulk of stock from the raw part 
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and roughs it into a shape that's close to the size of the model
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this is an extremely powerful tool
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it uses an advance strategy of milling motion, commonly  referred to as high speed machining.
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high speed machining involves taking a lighter width of cut, the side cut,
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a longer depth of cut,
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and tool path motion that flows.
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there are no radical changes in direction on HSM tool path. the 2D adaptive tool path can be found here under our 2D tool paths.
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for adaptive clearing.  as a default all tool path motion is in a climb cut rather than a conventional cut.
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instead of making right angle moves off of the work piece, fusion calculates arc motion that 
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blends onto and off of the part. the result is smooth fluid motion
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that keeps the machine from jerking between moves.
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this reduces tool wear and tool breakage
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due to the NC paths consistent cut volume.
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some people think you need to have a modern machine
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with an expensive high RPM spindle to take advantage of HSM.
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this is not true.  every NC machine will benefit from fusion's innovative and efficient HSM tool path motion.
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So from our 2D menu we'll go to Adaptive clearing.  
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on our tool tab, we will press select, to select our tool. as we look the tools in our library, especially the Intro to 2D machining library,
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you'll notice that the description of the tool is bunched together.
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There's a heading up on the top for each one of these columns. if we move just to the left of the cutting diameter, we'll get a double bar with arrows.
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grab that with your left mouse button
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and slide over we can expand that column
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to see the full name of the tools
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for this lesson we want to use the half inch flat end mill.
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Give that a double click and it makes that our selected tool.
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next will go to our geometry tab and pick the lower edge of the part model.
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this will represent the boundary limit for machining
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and also the final depth of the cut. 
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with no other selections fusion will assume the stock boundary is the outer machining boundary. 
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the 2D adaptive tool path will clear away all the stock between the outer stock boundary and the inner boundary.
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selecting the bottom edge of the model as our cutting boundary, also set our bottom height and depth.
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Lets switch to our Heights Tab,	
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and we can see that our bottom height is set in reference to the selected contour.
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but it's set to a value of zero we may want a cut passed the bottom edge of the part.
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for this example we will set this -.030
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on the passes tab we can select our cutting parameters
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the default year shows an optimal load of .200 
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this is the cutting step in X & Y. you can adjust this to any value like. we suggest contacting your tooling supplier
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for recommendations on step over amounts and cutting speeds.
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let's say we want our optimal load to be .060", you can simply enters .060 as the value. you also have the ability to set 
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this value as a percentage of the tool diameter. simply move your mouse cursor over the optimal load value
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right click your mouse and when you do, you get several choices.
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click on edit expression.
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the expression shows a variable called tool_diameter.
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this is a system variable and it contains the value of the currently selected tool. so having the expression of
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tool_diameter x .40 is what is giving us a .200 optimal load.
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we're going to change this value, instead of .40, 
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to be 0.12
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and we will OK this.
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now our optimal load shows the value of .060".
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you also have the ability to right click over that box and make this the default value.
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next there's an option here for smoothing. 
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If you mouse over this for a second, it will  give you a description of smoothing.
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smoothing removes excessive points and filters arcs wherever possible. so this will reduce your program size and give you a better fit  
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for your tool path. so I encourage you to check that and turn on.
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Lets take a quick look at the linking tab.
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there's really nothing we need a change in here for right now,
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so we will press OK.
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and let it generat our tool path.
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so now we have roughed away the stock from the outside of the block.
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