Gondola preparations

So today we are trying to prepare the main frame to our gondola. The rough idea is sort of like this.

You are seeing rectangular shape formed by CF tubes and corners from 3D printed ABS, while there are clamps to hold three plates. Front for controllers, middle for batteries, which will also serve as balancing the centre of gravity and the rear one for small batteries pack to feed servos.

While constantly working on a good source of tubes, the corner ended up today’s goal. It looks simple but its model evolved through several weeks. Final OpenScad code is below, describing tube-in-tube design from Serge.

use <ShortCuts.scad>
use <tubes.scad>

module corner_tube(simple) {
D(){
union(){
rotate_extrude(convexity = 10, angle=90)
translate([50, 0, 0]) {
D() {
  circle(d = 29.5);
  circle(d = 25.5);
}
if(!simple) {
square([0.8,26.5], center=true);
square([26.5,0.8], center=true);
Rz(45){
square([0.8,26.5], center=true);
square([26.5,0.8], center=true);
}}}
if (!simple)
for( i = [0 : 2] ){
R(90,0,70/3*i+22)
Tx(50)
cylinder(0.8,13.5,13.5);
}

if (!simple)
rotate_extrude(convexity = 10, angle=90)
translate([50, 0, 0]) {
circle(d = 12);
}}

if (!simple)
rotate_extrude(convexity = 10, angle=90)
translate([50, 0, 0]) {
circle(d = 11.2);
}
}}

module leg_tube(simple) {
D() {
T(35.3,35.3,0)
R(20,20,90){
  union() {
    tube(0,0,0,29,14.7,14.7,2);
    tube_enforce(70, simple);
  }
}
rotate_extrude(convexity = 10, angle=92)
  Tx(50)
  circle(d = 29);
}}

module panel() {
D() {
minkowski() {
D() {
T(2,2,-1)
cube([40,40,1]);
Rz(45)
cube([30,30,80], center = true);
}
sphere(0.5);
}
  rotate_extrude(convexity = 10, angle=90)
  Tx(50)
  circle(d = 29);

  //screw hole 1
  T(20,8,-5)Rz(45)
  minkowski() {
  cube([10,0.1,0.1]);
  cylinder(10,1,1);
  }

  //screw hole 2
  T(9,20,-5)Rz(45)
  minkowski() {
  cube([10,0.1,0.1]);
  cylinder(10,1,1);
  }}

  D() {
  minkowski() {
  R(90,0,-135)
  translate([-36,5,-0.5]) linear_extrude(1) {
    polygon(points=[[-5,-5],[20,-5],[-11,20]], paths=[[0,1,2]]);
  }
  sphere(0.5);
  }
  rotate_extrude(convexity = 10, angle=90)
  translate([50, 0, 0]) {
  circle(d = 29.5);
}}}

module corner(simple = false) {
corner_tube(simple);

Tx(50)
Ry(45)Rx(90)
tube_enforce(50, simple);

Ty(50)Rx(-45)Ry(-90)
tube_enforce(50, simple);

leg_tube(simple);
panel();
}
corner(true);

The idea started quite simple.