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Extrusions & Cuts

In this tutorial you learn how to write the code to create a model from a sketch in DynaMaker. The example is a metal washer using one extrusion and one cut, similar to a stamping process.

You will complete four steps:

  1. Create component
  2. Create sketches
  3. Create model
  4. Add cut to model
tip

🎥 You can also follow the tutorial with this video:

1. Create Component​

Create a component container and name it WASHER.

2. Create Sketch​

Create the base circle sketch:

  1. At the top of the code section click Sketch.
  2. Choose shape Circle.
  3. Click Create.

3. Create Model​

With the sketch ready, create the extrusion:

  1. Click Model.
  2. Select Extrude using the new generateCircleSketch.

4. Add Cut to Model​

Add the hole to the washer inside generateExtrudedCircleModel:

  1. Define the hole diameter (80% of the washer diameter).

    const holeDiameter = 0.8 * diameter

  2. Create the hole sketch using the GEOM2D function with holeDiameter.

    const holeSketch = GEOM2D.generateCircleSketch(holeDiameter)

  3. Add the cut using the same plane and extrusion length.

    model.addExtrudeCut(holeSketch, plane, extrudeLength)

  4. Click Save & Run to apply changes. :::tip

    You can also use Ctrl/Cmd+S to Save & Run. If you are prompted to save the web page, first focus the code editor by clicking inside it before using the shortcut.

    :::

  5. The completed function matches the version below.

    export function generateExtrudedCircleModel(diameter: number, extrudeLength: number) {
      const model = new SKYCAD.ParametricModel()
      const sketch = GEOM2D.generateCircleSketch(diameter)
      const plane = new SKYCAD.Plane(0, 0, 1)
      model.addExtrude(sketch, plane, extrudeLength)

      const holeDiameter = 0.8 * diameter
      const holeSketch = GEOM2D.generateCircleSketch(holeDiameter)
      model.addExtrudeCut(holeSketch, plane, extrudeLength)

      return model
    }

If you do not want a dynamic thickness (extrudeLength), create a constant const thickness = 5 instead. Then the function can look like this:

export function generateExtrudedCircleModel(diameter: number) {
  const thickness = 5

  const model = new SKYCAD.ParametricModel()
  const sketch = GEOM2D.generateCircleSketch(diameter)
  const plane = new SKYCAD.Plane(0, 0, 1)
  model.addExtrude(sketch, plane, thickness)

  const holeDiameter = 0.8 * diameter
  const holeSketch = GEOM2D.generateCircleSketch(holeDiameter)
  model.addExtrudeCut(holeSketch, plane, thickness)

  return model
}

note

The slider for extrudeLength disappears above the visualization because it is not an input to generateExtrudedCircleModel and is a constant thickness instead.

In the next tutorial (3D Models) you go deeper into functions and make more changes.