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2D milling is a planar machining process. it's sometimes called 2-1/2 axis machining
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because all the cuts are limited to a two axes plane,  normally the XY plane, and then the depth cuts are taken in the third axis, 
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normally the Z axis. when you select the 2D pull down there are a variety of tool paths to represent this type of machining.
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this lesson will focus on the face tool path.  face or facing
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is the process of milling the rough stock off the top of the part, to make it flat
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you'll find some of the parameters will be similar between tool paths.
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selecting a tool from the tool library, editing the tool parameters,
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feed rates and setting the machine Heights, will be common to all tool paths.
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so select the face tool path from the 2D pull down menu. 
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the first tab in the face milling dialogue, is for the tool and it's speeds and feeds.
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under tool, press select to enter the tool library.
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there are a number of tool libraries that can be displayed
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each library has a header name.
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this sample part has tools already defined. you'll see the heading intro to 2D machining
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and if you right click your mouse
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over the 2 inch diameter bull nose mill, a list of options will appear. you can edit, copy, paste, 
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duplicate and delete any tool.   select edit tool and will examine some of the tool parameters
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there are number of parameters you can use to modify a tool. on the cutter tab you can modify lengths, diameters, the cutting parts
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and the non cutting parts of the tool. you can also enter the number of flutes, or the cutting edges.
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even the manufacturers catalog information
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the feeds and speed tab is for entering the default cutting values for this tool.
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we don't need to make any changes.
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simply press the cancel button
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and then press OK to select this tool.
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on the geometry	teb is where you would normally select the profile to be machined
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in this case we wanna face mail the entire stock. fusion assumes that
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and shows the stock boundary.
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so there's nothing for us to pick.
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now we can go to the Heights Tab.
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the Heights Tab is for setting clearance positions and depths in the spindle axis, normally the Z axis.
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clearance height is the fully retracted position above the part.  it represents the safest height you can move the tool to. 
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retract height is the position the tool retracts to between cuts, when taking multiple cuts on a profile or pocket.
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feed height is where the tool starts its feed move to the cutting depth.
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normally this is a minimal distance above the material to be removed.
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top height defines the actual top of the surface to be machined.
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it's the top of the material to be removed.
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bottom height is the final depth of the cut.
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each of these Heights can have a different relationship. some positions will be in reference to the model.
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some will be in reference to the stock you define. some Heights can be in relationship to other Heights so when you specify the offset value for 
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the height, you could also describe what it's in relation to.
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when you mouse over any of these categories for the From input,
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it will give you a full description of what you can be in relationship to.
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Now we also have a floating dialogue here that you can put anywhere you want
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so when you're addressing the clearance height you can input here you can also select some of these from here
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and change their value
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or you can simply grab one of these and drag them up or down.
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you may notice that grabbing the retract height and moving it up will change the clearance height.
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and that's because our clearance height is in relationship to the retract height.
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so for this lesson
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I'm going to set my retract right to 0.200,
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my clearance height to 0.400,
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my feed right
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to 0.200,
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my top of stock to zero and my bottom height to zero
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but it's the relationships that are important
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I'm saying the top height
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is in relationship to the top of the stock, and it's zero distance from the top of the stock.
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whereas the bottom height
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is zero distance
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from the top of the model.
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so however much stock we have on the top of the part is how much it will be facing off.
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next we'll take a look at the passes tabs. Some Tabs will require information specific to that exact tool path. In this case with facing
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we can control the pass direction,
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the direction of the first cut
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the pass extension, how far to move or start off the edge of the part, and the step over amount between cuts.
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in this case i"ll set to pass extension to be approximately 1 inch
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and I'm going to set my step over
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to be 1.8
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that should allow me to take the cut across the top face
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in one pass. there are other parameters we can use to control the facing but this is all we need for right now.
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next we'll go to the Linking tab. Linking controls motion between multiple cuts. if the tool path is generating many small cuts
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and you're getting lots of retract moves to the clearance height, you can limit the number of retracts, using these parameters.  if the area has 
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lots of ribs you may need a full retract to the clearance height.
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if the area is generally open, there is no reason for a full retract. fusion evaluates these parameters along with the distance from the end 
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of one cut, to the start of the next, to determine if are retract should be  output
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increasing the maximum stay down distance reduces the number of retracts and instead 
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replaces them with feed moves to the start of the next cut.
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you can see here in this graphic how increasing that maximum stay down distance keeps the tool
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closer down into the cavity. staying closer to the cavity will most likely reducer cycle time as well.
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next we have leads and transitions this is how it's going to lead onto the part. We're going to set our lead in value
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to 0.200
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and this is a vertical lead in a radius which is perfect for leading into a very tight area
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once were completed we can say OK and there's our tool path.
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