Subversion Repositories group.electronics

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120 pfowler 1 
// START lower Conical Knob
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knob_t = 18;
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knob_b = 22;
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knob_h = 12;
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knob_outer_wall = 2;
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top_shaft_h = 6;
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top_shaft_w = 8;
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scale([0.5,0.5,1]) {
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union() {
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translate([0, 0, 0]) {
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	difference() {
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	union() {
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		difference() {
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			difference() {
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				cylinder(knob_h,knob_b,knob_t);
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				union() {
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					difference() {
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						cylinder(8,knob_b-knob_outer_wall,knob_t-knob_outer_wall);		//Hollowing
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						union() {
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							translate([0,0,4])cylinder(top_shaft_h, top_shaft_w, top_shaft_w); // Top centre hole
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							difference() {
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								cylinder(12,12,12); // Flared bottom hole
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								cylinder(12,10,10);
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							}
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						}
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					}
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				}
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			}
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			difference() {
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				cylinder(12,6,6);
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				translate([4,-1,8]) {
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					cube([2,2,4]);
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				}
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				translate([-6.5,-1,8]) {
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					cube([2,2,4]);
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				}
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			}
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		}
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		for ( i = [0:7] ) {
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			rotate (i*360/8, [0,0,1])
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				translate([7,-1,4]) cube([4,2,6]);
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		}
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	difference() {
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		for ( i = [0:15] ) {
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			rotate (i*360/16, [0,0,1])
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				translate([10,-1,0]) {
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					difference() {
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						cube([12,2,12]);
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					}
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				}
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		}
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		difference() {
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			cylinder(12,30,24);
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			cylinder(12,24,18);
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		}
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	}
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	}
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		union() {
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			translate([0,0,9]) {
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				difference() {
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					cylinder(5,30,12);
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					cylinder(5,24,9);
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				}
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			}
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			difference() {
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				cylinder(2,26,26);
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				cylinder(2,23,23);
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			}
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		}
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	}
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}
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}
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}
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// END Lower Conical Knob