Lesson 3: Roughing

In this lesson, learn about the Adaptive Clearing roughing strategy, and the differences between 2D and 3D Adaptive Clearing.

 

Tutorial: Create Adaptive Clearing Toolpaths

Using a reciprocating saw design, you create facing and roughing toolpaths.

Create a Facing Toolpath

In this step, you add the first toolpath, a facing operation. You also explore dialog tabs that are common to all toolpath operations.

  1. If the Data Panel is not open, click Show Data Panel

    image.
  2. In the Data Panel, open CAM 3_Adaptive Overview from Projects Samples Workshops & Events ➤Adoption Path ➤ Toolpath Programming ➤ 3_Adaptive Clearing.
  3. In the CAM workspace, choose 2D Face.
  4. In the Face dialog, explore the five tabs:

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    • Tool. These settings let you select a tool for the operation. You can edit the tool in the tool library to set default feeds and speeds.
    • Geometry. In these settings, you select geometry and define what to machine.
    • Heights. These settings specify heights at which the operation functions.
    • Passes. These settings control how the cutting toolpaths are generated.
    • Linking. These settings control noncutting toolpaths.

      Autodesk Fusion 360 uses the same tabs for all toolpath operations. This approach allows you to work with each toolpath using a familiar interface.
  5. For the facing operation, you need to select a facing tool. On the Tool tab, click the Select button.
  6. In the Select Tool dialog, select 171 - Ø2" Face Mill (2" Face Mill). Click OK.
  7. On the Geometry tab, verify that Stock Selections is set to Nothing.
    The facing toolpath removes material from the top of the stock, so you do not want any geometry selected.
  8. Select the Heights tab and verify the following values:
    • Top Height From is set to Stock Top.
    • Bottom Height From is set to Model Top.
  9. Click OK to generate the toolpath.


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Create a 3D Clearing Toolpath

You need to rough out the part, removing unwanted stock material. In this step, you create a 3D adaptive clearing toolpath to remove the bulk of the unwanted material.

  1. Choose 3D Adaptive Clearing.
  2. In the Adaptive dialog, click the Select button.
  3. In the Select Tool dialog, select Ø3/4" R0.09" Bull Nose. Click OK.
  4. In the Adaptive dialog, click the Geometry tab and verify that Stock Selections is set to Nothing.
    This operation roughs out the entire saw mold, so the range of the toolpath is based on the stock represented by the yellow rectangle.

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  5. On the Heights tab, specify the following values:
    • Set Top Height From to Model Top.
    • Set Bottom Height From to Selection.
  6. Select the flat part of the mold for the bottom height.

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  7. Click the Passes tab. Right-click in the Optimal Load box and choose Edit Expression.
  8. In the Expression dialog, enter tool_diameter * 0.3. Click OK.
    The formula calculates 0.225 in.
  9. Right-click in the Maximum Roughing Stepdown box and choose Edit Expression.
  10. In the Expression dialog, enter tool_fluteLength * 0.8. Click OK.
    The formula calculates 3.3 in.
  11. On the Linking tab, specify the following values:
    • Set Maximum Stay-Down Distance to 20 in.
    • Set Minimum Stay-Down Distance to 0.1 in.
    • Set Stay-Down Level to 70%.
  12. Click OK to generate the toolpath.


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Create a 2D Clearing Toolpath

In this step, you create a toolpath to clear out the open pocket of the saw mold.

  1. Choose 2D Adaptive Clearing.
  2. In the 2D Adaptive dialog, verify that Tool is set to Ø3/4" R0.09" Bull Nose.
  3. Click the Geometry tab.
    When creating 2D toolpaths, you select geometry that defines the boundary of the operation. Use the ViewCube to reorient the design so that you are facing the open pocket.
    Next, you'll select pocket contours.
  4. Select the bottom contour of the open pocket.

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  5. Select a shoulder open edge.

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  6. The opposite shoulder open edge is obstructed. Hold down the left mouse button and chose Edge in the menu that appears.

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    TIP If the menu does not appear, enable the select-through selection filter and try again. (To enable this filter, switch to the Model Workspace and choose Select ➤ Selection Filters ➤ Select Through.)
  7. In the dialog, verify that Pocket Selections is set to 3 Chains.
    The geometry selection is complete.

    image

  8. On the Heights Tab, set Top Height From to Selection.
  9. Select the flat part of the mold.

    image

  10. On the Linking tab, specify the following values:
    • Set Minimum Stay-Down Distance to 0.1 in.
    • Set Stay-Down Level to 80%.
  11. Click OK to generate the 2D clearing toolpath.


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Simulate the Clearing Toolpaths

Toolpath simulation allows you to validate tool movement and observe the stock material as it is cut. In a later tutorial, you will learn more about toolpath simulation. For now, you just want to see how the stock material is cut during the clearing operations.

  1. In the browser, select the Setup node that contains the toolpaths. Choose Actions Simulate.
    Fusion 360 displays the toolpaths you created earlier in this tutorial.

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  2. In the Simulate dialog, select the Stock box.
  3. To begin simulating the clearing toolpaths, click Play
    imageat the bottom of the screen.
  4. In the dialog, clear the Toolpath box.
    The following image shows the stock material at the end of the clearing operations.
    image

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