My_Heart_Threads

thingiverse

// response to openscad screw threads with linear_extrude by speedymollusc // For OpenScad coders. // A slice through a bolt has the shape of a shallow heart. // If we look at it radially from zero to 180 degrees, // it increases linearly from the minor to the major radius. // At zero degrees it will have the radius of the minor radius of the threads // at 90 degrees it will be at the pitch radius // then at 180 degrees it will be at the major radius. // It's the same on the other side of the heart just mirrored across the X axis. // This shape is made in module MaleThread using a polygon // with a point on the X axis at radius [MinorTR+j/180*TH,0]] // this simple equation just progresses from the minor radius // to the major radius as j (the angle) goes from 0 to 180 // Then this polygon is rotated j degrees to the proper position on the heart. // This is hulled and then mirrored to the create the other half of the heart. // three examples are given a .5 inch NPT pipe thread , a .5 inch 13TPI bolt thread // and an artistic thing so you can see the heart of it all