drone_chassis_openscad

drone_chassis.scad

c_diam = 6.9;
c_rad = c_diam/2;

// this comes from the projection of the length
// of the rectangle onto the axis (the rectangle's 
// corner is on the origin and it is at 45 deg
// so follows: 2a^2 = c^2 which reduces to sqrt(2)*a = c
// final form is a=c/sqrt(2)
l1_projected = 107.9/sqrt(2);
l2_projected = 16.9/sqrt(2);
// this is used because you have to subtract the projection
// of the overhang after mirroring the part.
mirror_distance = l1_projected-l2_projected;


translate([mirror_distance,0,0]) {
rotate([0,180,-45]) {
// this is the rectangle with holes, fundamental unit
difference() {
  difference() {
    square(size = [107.9, 16.9], center = false);
    translate([5,5,0]) {
      translate([c_rad, c_rad, 0]) {
        circle(d=c_diam);
      }
    }
    // this translates from the center point of the circle
    // so you don't have to include the circle radius in
    // the translation from 0,0
    translate([(91+5),5,0]) {
      translate([c_rad, c_rad, 0]) {
        circle(d=c_diam);
      }
    }
  }
}
}
}


rotate([0,0,45]) {
// this is the rectangle with holes, fundamental unit
difference() {
  difference() {
    square(size = [107.9, 16.9], center = false);
    translate([5,5,0]) {
      translate([c_rad, c_rad, 0]) {
        circle(d=c_diam);
      }
    }
    // this translates from the center point of the circle
    // so you don't have to include the circle radius in
    // the translation from 0,0
    translate([(91+5),5,0]) {
      translate([c_rad, c_rad, 0]) {
        circle(d=c_diam);
      }
    }
  }
}
}