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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 app & block
  2. Create sketches
  3. Create model
  4. Add cut to model

1. Create App & Block​

Create a new app via + Create as done in Tutorial 1, or simply create a copy of it:

2. Create Sketch​

Already in your new component block, create the base circle sketch:

  1. At the top of the code section, click 2D Geometry > Sketch > Template > Circle.
  2. Click Create.

You will see the new generateCircleSketch() function under GEOM2D:

3. Create Model​

With the sketch ready, create the extrusion:

  1. Click 3D Geometry > Extrude > Template.
  2. Select the generateCircleSketch we just created.

You will see the new generateExtrudedCircleModel() function under GEOM3D:

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, so the function looks 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 anymore but a constant (thickness) instead.

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