{
 "sources": [],
 "what": "motion.interference of the arm turning 0 to 30, short of the block",
 "source": "analytic",
 "method": "Base: box 20x20x10 from (-10,-10,-10), grounded; Arm: box 40x10x10 from (0,-5,0), centre (20,0,5); Stop: box 50x10x10 from (-10,30,0), grounded; the arm's corner (40,5) turned \u03b8 reaches y = 40 sin \u03b8 + 5 cos \u03b8, which is 30 at \u03b8 = asin(30/\u221a1625) - atan(5/40) = 40.9676; 30 < 40.97: no collisions",
 "body_count": 3,
 "volume_mm3": 13000.0,
 "results": [
  {
   "step": 14,
   "json": {
    "clear": true,
    "collisions": []
   }
  }
 ]
}