Machine a 3D dome feature

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Machine A three D. Dome Feature.

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After completing this video, you'll be able to

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use three D spiral use three D. Scallop and evaluate material removal

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infusion 3 60. Let's carry on with our three access sample op two data set.

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At this point we've used three D. Adaptive to both rough and semi finished our part.

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Now we're going to be using some finishing strategies to

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take a look at finishing various geometry on the part.

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First we want to focus on this dome feature on the left hand side

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to do this, we're going to evaluate two separate tool paths.

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In this case we're going to start with a spiral

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tool path and then focus on a three D scallop

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To get started. Let's go to our three D. Menu and take a look at the spiral tool path.

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It's always important to hover over the tool path and enable the tool tips and your

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user preferences to get a good idea for a preview of what these tool paths do.

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A spiral tool path is used on circular or radial type

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features and this could be a good option for us.

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In this case

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let's go ahead and select the spiral tool path and make

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sure that we select our ball end mill for this example.

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We do want to use the quarter inch ball end mill

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and make sure that we select aluminum finishing for our cutting data

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From here. We're going to move on to our geometry

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and much like many of the other 3D tool paths.

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We can select a machining boundary by the silhouette of our part,

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a bounding box or a physical selection.

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But there is another way that we can focus the tool on a certain area.

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The avoid touch surfaces has a touch option that allows us

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to select just the services that we want a machine.

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In this case I'm going to select the dome portion,

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the filet

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and the flat faces around it,

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then I'm going to move on to my passes section and take a look at the passing options

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right now the spiral mode is set to spiral but notice

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that we have a spiral with circles and concentric circles.

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We're going to evaluate spiral first and then we'll come back and make some changes.

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I'm going to increase the outer limit as this is

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going to determine how far out the tool bath can

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go and we need to have this a bit larger to ensure that we are cutting the entire area.

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Also note that the cusp it by default is 0.1

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and we're going to leave that on and say okay

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when we take a look at this tool path,

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you'll notice that right now the tool does not exit this boundary,

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it's leaving a small amount of material on the side.

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So the first thing that we want to do is evaluate our

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options to make sure that the tool does exit that side.

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So back in the tool path, in our geometry section,

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we want to enable contact point boundary we're going to say okay,

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and allow it to regenerate.

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And now you can see that the tool does go all the way to the edge.

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We can use F seven to toggle on the tool path

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and we can see exactly where the tool is going.

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Now that we've evaluated that tool motion. Let's go back into the spiral tool path.

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Let's go to our passes and let's change the spiral mode to spiral with circles.

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We'll say OK, and regenerate the tool path.

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Notice in this instance it doesn't make any difference to our selection.

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Part of the reason is because of our geometry,

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we've got these flat sections here and it's not able to generate

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a spiral with circles to be able to machine all that geometry.

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Let's try the other option.

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Underpasses section, we'll use the spiral concentric circles option and say OK,

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once again, there is no drastic change to the overall tool path.

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There is another spiral tool path that I

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think we should mention called morphed spiral.

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And again in this instance it will provide the exact same result.

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But more spiral can be helpful if you're

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not dealing with true circular or concentric type geometry

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for this option.

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Let's go back to our tool path,

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let's go back to our passes and let's leave it on the spiral option and say OK

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the spiral tool path is just one of many finishing strategies

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that we could use on this geometry but there are some inherent

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problems with using this type of strategy mainly because with a dome

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or a circular feature as we move back and forth over,

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we're going to get less resolution around the outside of the part.

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We could come back and finish this.

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Lower, fill it with a tool path like a three D pencil.

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But in this instance, I actually want to suppress the tool path

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and I want to evaluate another finishing strategy called the scallop.

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Now we take a look at the scallop tool path.

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This tool path can also be used on circular features

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but it creates the geometry in a slightly different way.

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We're going to again use the same quarter inch ball and for

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our geometry we are once again going to use the same,

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avoid touch surface options.

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We're going to use touch and select the fill

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the dome and the two flat faces on either side.

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In the past this section notice that we have a step

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over amount but we don't have a cusp it amount.

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The step over amount is going to control how much the tool moves over for each pass.

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I'm going to leave it at .01 for right now,

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but we might evaluate that after we review the tool path.

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Also note the direction is both ways by default,

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which will allow it to cut up and down the geometry and the up down

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milling option will determine whether or not we go from the bottom to top,

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top to bottom or use both.

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We're going to say okay and evaluate the tool path.

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We can see that this tool path also has the same

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issue where it's not exiting this side of the part.

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So let's go back into our options under the geometry section and

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make sure that we turn on contact point boundary and say okay,

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once it regenerates this tool path,

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you'll notice that there is one drastic difference

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between this and our previous spiral attempt.

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The scallop tool path has these v motions where

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it's changing direction and going around the sphere.

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It also creates this triangular section as it gets closer to the bottom.

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So this is going to give us a closer

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to realistic finishing strategy for this type of geometry

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and scallop isn't necessarily intended or focused

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on just spherical geometry like this.

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It can be used in other instances which we will take a look at in just a little bit

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at this point.

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I think it's important that you evaluate the spiral

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and the scallop tool paths on your own.

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You review the tool path motion by toddling on the tool path display

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and later on we're going to focus on evaluating these through simulation.

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But for right now let's go ahead and activate up to once more.

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Just to make sure that we're back at our name view.

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Let's save the design before we move on to the next step