Cut an external contour

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Cut an external contour.

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After completing this video, you'll be able to

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create a two D contour tool path to rough caliper geometry

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and create a two D contour tool path to finish caliper geometry

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in fusion 3 60. Let's carry on with the data set from our previous example.

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At this stage, we've created a 3D adaptive tool path

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and I'm going to temporarily hide our tool path visibility

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so we can just see the in process stock.

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We've done a good job of removing a lot of the material.

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And now we need to go back in and refine and finish off various areas

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depending on the part you're machining and

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where the areas have critical tolerances would dictate

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the order of operations that you typically do in order to remove that material.

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For this part.

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What we're gonna do next is use a two D contour tool

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path to clear and finish out the outside of our part.

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Remember our 3D adaptive and even two D adaptive tool paths

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are going to be roughing tool paths.

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We're gonna use them to efficiently remove a lot of material and

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come back with other tool paths to finish off those areas.

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So in order to do that,

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we're gonna get started from our two D dropdown and select two D contour.

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Also note that this is one of the default tool paths on our toolbar.

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So we can select it here as well.

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We're gonna carry on with tool number seven.

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So we don't need to make any tool selection,

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but we're gonna move on to our geometry tab.

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There are multiple ways in which we can select this.

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But one issue that we have with this part

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is the fact that there is no external contour that we

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can just select for the entire outside of our part.

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What we need is an entire silhouette of the part.

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What you can do is create a two D sketch or you can use some

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of the options that we have here to select the silhouette of our part.

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So for example, if we use a silhouette selection,

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we can see on the screen exactly what's displayed.

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This gives us an entire outside silhouette of the

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part without having to create any additional geometry.

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We do have a couple of options. We can do just the outer loops.

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If we want to avoid the holes,

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we can do just the inner loops or we can do both for this option.

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We want to use the outer loops only and also note that we can do start outside,

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start inside or always stay out or in

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because we only have the outside contours of the silhouette.

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We're just gonna leave the side option to start outside and say, ok,

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now that we have this selected, we can move on to our next tab,

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which is going to be our heights

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because the bottom height is based off the selected contour and fusion 3 60

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defaults this to be all the way at the top of our part,

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we need to change this from our selected contour to use a selection.

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We're gonna select the bottom of the vice.

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And remember we had that offset for our 3d adaptive of 0.05.

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We also left enough stock on the bottom of 0.01.

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So we need to make sure that we match this value of 0.06.

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This way our tool is not going to be engaging stock that we left at the bottom

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and doing a cut around the bottom of our stock.

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We're gonna get exactly the same amount of

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material that was left behind from our adaptive.

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It also could be possible for us to leave just a little bit

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more so that the tool is definitely not engaging anything on the bottom.

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The reason that we might want to do this is to avoid smearing underneath

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the bottom of our tool or potentially

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pulling chips up and affecting our surface finish

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for this part. I think it's gonna be fine. So we're gonna go ahead and run with 0.06

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as we move over to our passes section. We need to determine how we want to cut the part.

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We're gonna leave the sideways compensation at left, which is gonna be our default

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and then our compensation type is gonna stay in computer.

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There are a couple of options here that you should be aware of in computer means that

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the tool path that gets exported from fusion 3 60 into our NC program

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is going to be the center of the defined diameter of our tool.

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This means that if there's any compensation that needs to happen at the control,

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it can't happen

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because it's all done in the code.

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If we use the in control option,

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this means that the compensation for the diameter or

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the radius of that tool is going to be

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done in the control and the code is going

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to output the exact location of our selected contour.

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So if you're using G 41 or G 42 to control the compensation or potentially where

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you would want to look at the in control where or inverse ware options here

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we're gonna be using in computer and we're going to assume that the

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diameter of our tool at the machine matches the diameter in fusion.

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We also have various options here where we can

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modify things such as the finish feed rate.

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If we want to speed up or slow down the tool for the final pass,

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notice that we can also repeat the finish pass

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allowing it to go back through a second time.

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And this again can help us with surface finish or potential chatter issues.

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Keep in mind that the finish speed and how much material is left behind.

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Those are all things that are going to affect this finish cut.

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But also the tool that we're using the flute,

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the helix angle, the material type, the feeds and speeds.

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All of these are going to have an effect on the overall finish of your part.

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So all these different factors will come from a little bit of time

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at the machine as well as making sure you understand your tools,

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your machine, the horsepower of your spindle,

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how well the part is hold and many other factors

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as we go down. Also note that there are plenty of other options.

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But some of the main options that we want to

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talk about are things like roughing passes and multiple depths.

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Keep in mind that we can toggle these options on to do roughing passes,

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but we have already gone through and done a 3D Adaptive.

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So there's really no reason for us to take care of these.

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We're gonna leave these options off as we will be exploring using two

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D contour with multiple depths and roughing passes in a future video.

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Last we have our linking parameters and these are going to

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look a little bit different than our 3D adaptive tool path

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because we now have more control over things like the horizontal lead.

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In in this case,

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the angle and the radius value the distance whether or

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not we lead in and lead out the same.

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And if we want to use ramping with our tool, once again,

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in fusion 3 60 you can hover over these options and

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get a tool tip that'll tell you what is going on

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and what the settings will do.

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For this example, let's say, OK. And let's take a look at this tool path.

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I want to toggle back on my tool path display using F seven.

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And we can see that the tool comes all the way to the bottom.

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It's entering from outside of the stock,

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which is perfect and it's moving around our part.

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This gives us a good idea as to what that finish

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pass is doing and remember that we repeated the finish pass.

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But because it's in the same exact position,

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it only appears that it's going around once we'll be able to

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validate that a little bit later when we take a look at simulation

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for now, let's go back to our name. View.

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We're gonna click the activate button next to

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one, make sure we save before moving on to the next step.