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2D Contour is a tool path to finish mill a profile
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at a specific Z depth
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these profiles can be internal or external, opened or closed. you have the capability of creating 
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multiples Z steps to cut down, or multiple side cuts on the profile.
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but the cutting motion always takes place on a 2D plane.
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a single 2D contour tool path can contain
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multiple chains and each can be cut to its own specific depth, as long as the cutting parameters are the same.
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meaning the same feed, speed, number of cuts etc.
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If we go to the 2D pull down we can select 2D contour.
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from a previous lesson we determined that the smallest inside radius is 0.125
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so we'll need to select a tool that will fi within that parameter.
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on the tool dialogue page press select to get a tool and you'll find a 0.2491
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flat 1/4" end mill.
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select that
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and press OK. 
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there are many areas that need to be finished contour on this part
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when selecting the geometry we only want pick multiple contours if they'll have similar cutting attributes.
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first we want a cut around the outside of the part.
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just as when we did the adaptive tool path to rough the outside,
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we'll want to cut past the bottom of the selected edge. we don't want to cut past the bottom edge
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for these pockets. that would ruin the part.  
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so for our initial tool path we're going to pick this bottom edge.
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now let's go to the Heights Tab
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and make sure that our bottom height is set to "from selected contour" and we want to set our offset
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depth to .03 , so we'll cut past the bottom edge of the part.
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2D counter is almost always used as a finishing cut. this means we need a hold of final size
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based on the tolerance and part requirements.
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to do that we need to provide the NC machine operator
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some way to control the final size of the cut. this is done with cutter diameter compensation. 
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sometimes referred to as cutter radius compensation.
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but more commonly known as cutter comp. for this we're going to go to our passes tab	
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and in here you'll find compensation type.
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we need to set the compensation type to either wear or inverse wear. this output the code to compensate to the  
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left or the right of the programmed path. the actual code will depend on the machines NC code requirements.
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the most common codes are G41 which is cutter comp left.
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And G42 which is cutter comp right. for our example set the cutter comp type to wear.
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some of the other parameters you may want to play with are, roughing passes and multiple depths.
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roughing passes will take multiple passes on the outside of a part and multiple depths will take multiple steps going down in Z.
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for now I'm going to leave those off
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and were going to go to our linking tab. On the linking tab you'll find something called lead in 
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and transitions. here we have lead in entry and we can also control a lead out or an exit value.
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lead in blends onto the part and lead out blends off of the part you can control the size of the lead in out with the parameters shown.
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the first three parameters in the highlighted box control how it blends on in the contour plane. that is the cutting plane. 
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the vertical lead in radius allows the tool to do a 3D arc blending down to the cutting plane.
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Im going to set my horizontal lead in radius
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to an 1/8"
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and do a 90 degree sweep blending on to the part
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and a linear distance
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of an 1/8"
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for my vertical lead in, that will also be an 1/8".
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as a default you would want your lead out to be the same as the lead in
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normally that's the case. however you can unchecked this and make your lead out a completely different value if you want to
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with those changes made were going to say OK
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and there's our contour tool path around the part.
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