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= KnobDiameter/2 * (1 - TaperPercentage/100); KnobRadius = KnobMinorRadius + (KnobMajorRadius-KnobMinorRadius)/2; Divot=CapType; TaperAngle=asin(KnobHeight / (sqrt(pow(KnobHeight, 2) cube([2, 2, KnobHeight+.001], center=true); cube([RingWidth*.5, MarkingWidth, 2], center=true); cube([8, 3, KnobHeight], center=true); // Pointer1: Offset hemispherical divot sphere(r=DivotRadius, $fn=40); // Divot1: Centered cylynrical divot // Divot1: Centered cylynrical divot // Hole distance from the top knobs // How much to cut off to create a D-shaped hole, set this to zero. ShaftLength = 0; // Height of the knob, as on a work based on http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, 27.0x27.0mm, 756 Ball, 32x32 Layout, 0.8mm Pitch, http://www.latticesemi.com/view_document?document_id=213 Analog Devices (Linear Tech), 133-pin BGA.

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