Smooth n' Curvy Star Knob (Customizable)
thingiverse
This highly customizable star knob boasts perfectly curved shapes in all the right places. I should know because I spent hours meticulously calculating every detail. Every dimension, including the number of points on the star and those listed in the "Customizer Notes" section, can be fully customized to create a wide variety of unique shapes and configurations. The knob features an easily removable shaft with options for either a hex cap bolt, hex nut, or round press fit. For a round shaft without a bolt head or nut, simply set either the boltHeadThickness or boltHeadDiameter parameter to zero. Users have reported issues with the Thingiverse customizer, where parts of the knob preview appear transparent, but the final model will not have any such holes if you click "Create Thing". Changing the angle can help if visualizing is difficult due to transparencies. This star knob fits M8 hex head bolts perfectly. We encourage users to share their creations and enjoy customizing this design! Customizer Notes The knob profile, viewed from above, is a curve made up of alternating inward and outward facing circular arcs formed by adjacent circles tangent to each other. Some parameters affecting the handle shape are illustrated below: Handle Inner Diameter (blue circle), Outer Diameter (green circle), and Point Radius (red). Changing the Inner Diameter can significantly impact the knob handle's shape. Values close to the Outer Diameter will create flatter sides, while smaller values will make the knob more curved. Stars with more points may require a smaller Point Radius and larger Inner Diameter to avoid overlapping or missing sections. Parametric Values Knob Handle // Number of points on the star: points = 3; // [3:20] // Diameter of the outermost tip of knob handle: handleOuterDiameter = 75; // Diameter of the innermost indent in the knob handle, affecting the profile curve around the edge: handleInnerDiameter = 30; // Radius of the star points: pointRadius = 10; // Vertical thickness of knob handle: handleThickness = 15; // Radius of top fillet, forming a rounded edge all around the top: rTopFillet = 10; // Radius of bottom fillet, forming a rounded edge all around the bottom: rBottomFillet = 2; Knob Base // Diameter of the base, comprising the mating surface when the knob is tightened: baseDiameter = 20; // Distance from the bottom of the knob base to the underside of the handle: baseHeight = 15; // Radius of fillet between handle and base of knob: rTransitionFillet = 10; Bolt Hole // Diameter of bolt hole, fitting bolt shank or plain round shaft: boltDiameter = 8.4; // Diameter of bolt head, size across flats (wrench size): boltHeadDiameter = 13; Set to zero if no head (shaft hole only). // Thickness of the bolt head (or nut): boltHeadThickness = 5.5; Set to zero if no head (shaft hole only). // Distance from base of knob to bottom of bolt head, how much thread is inside the knob: boltHeadHeight = 5; // Number of sides on bolt head (or nut), 6 for hex head bolt, 4 for carriage bolt, etc.: boltHeadSides = 6; // Diameter of counterbore, which the bolt head should fit freely inside. If 0, a default hex-head counterbore will be automatically calculated: boltCounterboreDiameter = 0; // Radius of rounded edge at top of counterbore: rCounterboreFillet = 2; Other // Resolution in mm, this model can take a long time to generate, especially at high detail. To keep things responsive use a coarse (higher numeric value) resolution while making changes, then change to a finer setting just before clicking "Create Thing" and generating the model: resolution = 0.75; // [0.2:0.05:5]
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