OpenJsCad demo: Parametric axis coupler

Source code

Below is the OpenJsCad script for this demo. To build your own models, create a .jscad script and use the OpenJsCad parser. For more information see the OpenJsCad documentation.

var cylresolution=16;

// Here we define the user editable parameters: 
function getParameterDefinitions() {
  return [
    {
      name: 'quality', 
      type: 'choice',
      caption: 'Quality',
      values: [0, 1],
      captions: ["Draft","High"], 
      default: 0,
    },    
  
    { name: 'diameter1', caption: 'Axis diameter of first coupler:', type: 'float', default: 12.2 },
    { name: 'shaftlength1', caption: 'Axis depth of first coupler:', type: 'float', default: 15 },
    { name: 'outerlength1', caption: 'Outer length of first coupler:', type: 'float', default: 20 },
    { name: 'nutradius1', caption: 'Nut radius of first coupler:', type: 'float', default: 4.65 },
    { name: 'nutthickness1', caption: 'Nut thickness of first coupler:', type: 'float', default: 4.2},
    { name: 'screwdiameter1', caption: 'Screw diameter of first coupler:', type: 'float', default: 5},
    { name: 'diameter2', caption: 'Axis diameter of second coupler:', type: 'float', default: 9.5 },
    { name: 'shaftlength2', caption: 'Axis depth of second coupler:', type: 'float', default: 10 },
    { name: 'outerlength2', caption: 'Outer length of second coupler:', type: 'float', default: 15 },
    { name: 'nutradius2', caption: 'Nut radius of second coupler:', type: 'float', default: 3.2 },
    { name: 'nutthickness2', caption: 'Nut thickness of second coupler:', type: 'float', default: 2.6},
    { name: 'screwdiameter2', caption: 'Screw diameter of second coupler:', type: 'float', default: 3},
    { name: 'outerdiameter', caption: 'Outer diameter:', type: 'float', default: 30 },
    { name: 'spiderlength', caption: 'Spider thickness:', type: 'float', default: 12 },
    { name: 'spidermargin', caption: 'Spider tolerance:', type: 'float', default: 0 },
    { name: 'numteeth', caption: 'Num teeth per coupler:', type: 'int', default: 2},
    
  ];
}

function main(params)
{
  cylresolution=(params.quality == "1")? 64:16;
 
  var outerdiameter=params.outerdiameter;
  outerdiameter=Math.max(outerdiameter, params.diameter1+0.5);
  outerdiameter=Math.max(outerdiameter, params.diameter2+0.5);

var spidercenterdiameter=outerdiameter/2;
  
  var part1=makeShaft(params.diameter1, outerdiameter,spidercenterdiameter,params.shaftlength1,params.outerlength1,params.spiderlength, params.nutradius1, params.nutthickness1, params.screwdiameter1, params.numteeth);  
  var part2=makeShaft(params.diameter2, outerdiameter,spidercenterdiameter,params.shaftlength2,params.outerlength2,params.spiderlength, params.nutradius2, params.nutthickness2, params.screwdiameter2, params.numteeth);
  var spider=makeSpider(outerdiameter, spidercenterdiameter, params.spiderlength, params.numteeth);
  
  if(params.spidermargin > 0)
  {
    spider=spider.contract(params.spidermargin, 4);
  }
  
  // rotate shaft parts for better 3d printing:
  part1=part1.rotateX(180).translate([0,0,params.outerlength1+params.spiderlength]);
  part2=part2.rotateX(180).translate([0,0,params.outerlength2+params.spiderlength]);
  
  var result=part1.translate([-outerdiameter-5,0,0]);
  result=result.union(part2.translate([0,0,0]));
  result=result.union(spider.translate([outerdiameter+5,0,-params.spidermargin]));
  return result;
}

function hexagon(radius, height)
{
  var vertices=[];
  for(var i=0; i < 6; i++)
  {
    var point=CSG.Vector2D.fromAngleDegrees(-i*60).times(radius).toVector3D(0);
    vertices.push(new CSG.Vertex(point));
  }
  var polygon=new CSG.Polygon(vertices);
  var hexagon=polygon.extrude([0,0,height]);
  return hexagon;
}

function makeSpider(outerdiameter, spidercenterdiameter, spiderlength, numteeth)
{
  var result=new CSG();
  var numspiderteeth=numteeth*2; // spider has twice the number of teeth
  for(var i=0; i < numspiderteeth; i++)
  {
    var angle=i*360/numspiderteeth;
    var pie=makePie(outerdiameter/2, spiderlength,angle-90/numspiderteeth, angle+90/numspiderteeth); 
    pie=pie.translate([0,0,0]);
    result=result.union(pie);
  }

var centercylinder=CSG.cylinder({start:[0,0,0], end:[0,0,spiderlength], radius:spidercenterdiameter/2, resolution:cylresolution});
  result=result.union(centercylinder);

return result;
}