Created
April 21, 2024 02:19
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| //OpenSCAD module to create an ogive of given length for a given circle diameter (gauge) | |
| GAUGE13=2.3;//mm | |
| module ogive(gauge=GAUGE13, length=10){ | |
| //gauge -> the DIAMATER of spoke | |
| //length the fin or ogive length FROM THE CENTER of the spoke | |
| gr = gauge/2; //gauge radius | |
| chord = length * 2; //length is 1/2 of a chord forming a right triangle along with large_radius as hypotenuse and (large_radius - gauge radius) as opposite | |
| large_radius = (chord)^2 / (8 * gr) + (gr / 2); | |
| large_d = large_radius * 2; | |
| difference(){ | |
| union(){ | |
| difference(){ | |
| translate([0,large_radius-gauge/2,0]) | |
| circle(d=large_d,$fn=360); | |
| mask(large_d, gauge); | |
| } | |
| mirror([0,1,0]) | |
| difference(){ | |
| translate([0,large_radius-gauge/2,0]) | |
| circle(d=large_d,$fn=360); | |
| mask(large_d, gauge); | |
| } | |
| } | |
| circle(d=gauge,$fn=360); | |
| } | |
| module mask(d=large_d,gauge=gauge){ | |
| b=10*d; //square side large enough separate the ogive profile | |
| union(){//squares to get half profile | |
| translate([0,-5*gauge,0]) | |
| square([b,b]); | |
| translate([-d,0,0]) | |
| square([b,b]); | |
| } | |
| } | |
| } |
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