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Autodesk Inventor - How to cut Irregular Helical Groove

Tutorial by Wilhelm Coetzer
Small

See tutorial below

  1. Step 1:

    [1]
    Create 2D sketch:
    - when entering the height: hhh=200 in text box
    - select any dimension > right-click > dimension properties > Document Settings tab: Select "show Expression" in Modeling Dimension Display
    - this is to be able to see which dimension has got what label (name); e.g. dia = d3 & height is hhh [as shown by the red arrows]

  2. Step 2:

    [2]
    Create 3D skecth:
    - helical curve
    - pitch&height
    - "d3" in diameter
    - "hhh" in height
    - "3.142*d3" in pitch (45deg slope = 1 revolution = 1 pitch)
    - rotation direction as required
    - (1) pick bottom point of 2d sketch centerline
    - (2) pick top point of 2d sketch centerline
    - (3)then the end of the base line

  3. Step 3:

    [3]
    Create workplane for swept surface:
    - new workplane
    - pick 3d helix
    - pick endpoint

  4. Step 4:

    [4]
    New 2d sketch:
    - pick workplane
    - right-click > "new sketch"
    - project geometry > point
    - draw horizontal line (line must intersect surface of vase when swept: therefore from centerline out past solid)

  5. Step 5:

    [5]
    Sweep:
    - surface
    - profile

  6. Step 6:

    [6]
    Revolve Solid:
    - revolve
    - pick axis

  7. Step 7:

    [7]
    3d sketch for swept cut:
    - create 3d sketch
    - intersection curve
    - (1) select helical surface
    - (2)(3) select vase (all surfaces)

  8. Step 8:

    [8]
    Switch off unneccesary surfaces/workplanes

  9. Step 9:

    [9]
    Ceate workplane on end of new 3d sketch:
    - new workplane
    - helix
    - endpoint

  10. Step 10:

    [10]
    New sketch to be cut from solid:
    - pick workplane
    - right-click > new sketch
    - project point
    - draw circle
    -finish sketch

  11. Step 11:

    [11]
    Swept cut:
    - (1) sweep
    - (2) cut
    - (3) path

  12. Step 12:

    [12]
    Circular array:
    - (1) Circular
    - (2) select sweep feature
    - (3) Axis > (4) select vase solid
    - (5) 12
    -

  13. Step 13:

    [13]
    Finished product

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