OpenFlexure Microscope OpenSCAD docs

large_gears.scad

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OpenFlexure Microscope: Gears for actuators *
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This is part of the OpenFlexure microscope, an open-source *
microscope and 3-axis translation stage. It gets really good *
precision over a ~10mm range, by using plastic flexure *
mechanisms. *
This file generates a small gear, for motor control. *
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(c) Richard Bowman, January 2016 *
Released under the CERN Open Hardware License *
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module printable_large_gears(ratio=2)

[Source]

module printable_large_gears(ratio=2){
    // check the ratio gives an integer number of teeth
    assert(floor(n_teeth_large_gear(ratio))==n_teeth_large_gear(ratio),"The number of teeth on the large gear is not integer");
    // Calculate the spacing from the gear pitch radius.
    // Add 4mm of clearance
    spacing = large_gear_pitch_radius(ratio) + large_gear_pitch_radius(ratio=2) + 4;
    // x and y gears
    repeat([0,2*spacing,0],2,center=true){
        large_gear(ratio);
    }
    // z gear
    large_gear(ratio=2);
}