Mini arrow fuselage components

[things.git] / mini-arrow-firewall.scad

diff --git a/mini-arrow-firewall.scad b/mini-arrow-firewall.scad
new file mode 100644 (file)
index 0000000..80140e5
--- /dev/null
+++ b/mini-arrow-firewall.scad
@@ -0,0 +1,102 @@
+infty = 100;
+eps = 0.01;
+
+motor_d = 28; // unused here, just for reference
+motor_screw_dist1 = 19;
+motor_screw_dist2 = 16;
+motor_screw_d = 3 + 0.5;
+motor_screw_head = 5 + 0.5;
+motor_center_hole = 8 + 2;
+
+outer_wall = 2;
+
+body_w = 60 - 2*outer_wall;
+body_h = 30 - outer_wall;
+body_depth = 25;
+strut_h = 12;
+corner_l = 8;
+
+motor_plate_h = 2.5; // base thickness of the motor mount
+motor_plate_add = 2; // horizontal size added to the holes
+wall = 1; // base thickness of other parts
+
+side_overhang = 1.5;
+
+// base plate overhang
+difference() {
+       translate([-body_w/2-side_overhang, -body_h/2-side_overhang, 0])
+               cube([body_w + 2*side_overhang, body_h + 2*side_overhang, wall]);
+       translate([-body_w/2+wall, -body_h/2+wall, -eps])
+               cube([body_w - 2*wall, body_h - 2*wall, wall+2*eps]);
+}
+
+// bottom plate with motor mount
+
+module motor_plate_body() {
+       hull() { // shorter screws
+               cylinder(r = motor_center_hole/2 + motor_plate_add,
+                       h = motor_plate_h);
+               for (angle = [-90,90]) {
+                       rotate([0, 0, angle])
+                       translate([motor_screw_dist1/2, 0, 0])
+                               cylinder(r = motor_screw_head/2 + motor_plate_add, h = motor_plate_h);
+               }
+       }
+
+       hull() { // longer screws
+               cylinder(r = motor_center_hole/2 + motor_plate_add,
+                       h = motor_plate_h);
+               for (angle = [0,180]) {
+                       rotate([0, 0, angle])
+                       translate([motor_screw_dist2/2, 0, 0])
+                               cylinder(r = motor_screw_head/2 + motor_plate_add, h = motor_plate_h);
+               }
+       }
+}
+
+difference() {
+       motor_plate_body();
+       // center hole
+       translate([0, 0, -eps])
+               cylinder(r = motor_center_hole/2, h = motor_plate_h + 2*eps);
+       for (angle = [-90,90]) rotate([0, 0, angle]) {
+               translate([motor_screw_dist1/2, 0, -eps])
+                       cylinder(r = motor_screw_d/2, h = motor_plate_h + 2*eps, $fn = 6);
+               translate([motor_screw_dist1/2, 0, motor_plate_h - (motor_screw_head-motor_screw_d)/2])
+                       cylinder(r1 = motor_screw_d/2, r2 = motor_screw_head/2, h = (motor_screw_head-motor_screw_d)/2+eps, $fn = 6);
+       }
+       for (angle = [0,180]) rotate([0, 0, angle]) {
+               translate([motor_screw_dist2/2, 0, -eps])
+                       cylinder(r = motor_screw_d/2, h = motor_plate_h + 2*eps, $fn = 6);
+               translate([motor_screw_dist2/2, 0, motor_plate_h - (motor_screw_head-motor_screw_d)/2])
+                       cylinder(r1 = motor_screw_d/2, r2 = motor_screw_head/2, h = (motor_screw_head-motor_screw_d)/2+eps, $fn = 6);
+       }
+}
+
+// struts
+for (x = [-1, 1]) for (y = [-1, 1]) scale([x, y, 1]) hull() {
+       translate([body_w/2-corner_l, body_h/2-wall/2, 0])
+               cylinder(r = wall/2, h = strut_h);
+       translate([motor_screw_dist2/2, motor_screw_head/2 + motor_plate_add - wall/2, 0])
+               cylinder(r = wall/2, h = motor_plate_h);
+}
+
+hole_l = 12;
+hole_h = 1.5;
+hole_z = 0;
+
+// corners
+for (x = [-1, 1]) scale([x, 1, 1]) {
+       difference() {
+               translate([body_w/2-wall, -body_h/2, 0])
+                       cube([wall, body_h, strut_h]);
+               translate([body_w/2-wall-eps, -hole_l/2, hole_z + wall])
+                       cube([wall + 2*eps, hole_l, hole_h]);
+       }
+               
+       for (y = [-1, 1]) scale ([1, y, 1]) {
+               translate([body_w/2-corner_l, body_h/2 - wall, 0])
+                       cube([corner_l, wall, strut_h]);
+       }
+}
+