{
 "object": "counterweighted-cranks",
 "license": "CC BY 4.0, Xem Studio",
 "les": "https://longearthsociety.com/engineering/",
 "files": [
  {
   "name": "cw-crank-disc-stroke10",
   "step": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke10.step",
   "stl": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke10.stl",
   "note": "counterweighted crank disc, 10 mm stroke (pin at 5.0), \u00d85 bore, M3 grub, mass opposite the pin \u2248 50% of the con-rod+piston at the pin radius"
  },
  {
   "name": "crank-web-stroke10",
   "step": "/files/hardware/counterweighted-cranks/crank-web-stroke10.step",
   "stl": "/files/hardware/counterweighted-cranks/crank-web-stroke10.stl",
   "note": "crank web (bar crank) 10 mm stroke, \u00d85 bore with set-screw hub, \u00d83 pin; two make a full crankshaft throw"
  },
  {
   "name": "cw-crank-disc-stroke15",
   "step": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke15.step",
   "stl": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke15.stl",
   "note": "counterweighted crank disc, 15 mm stroke (pin at 7.5), \u00d85 bore, M3 grub, mass opposite the pin \u2248 50% of the con-rod+piston at the pin radius"
  },
  {
   "name": "crank-web-stroke15",
   "step": "/files/hardware/counterweighted-cranks/crank-web-stroke15.step",
   "stl": "/files/hardware/counterweighted-cranks/crank-web-stroke15.stl",
   "note": "crank web (bar crank) 15 mm stroke, \u00d85 bore with set-screw hub, \u00d83 pin; two make a full crankshaft throw"
  },
  {
   "name": "cw-crank-disc-stroke20",
   "step": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke20.step",
   "stl": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke20.stl",
   "note": "counterweighted crank disc, 20 mm stroke (pin at 10.0), \u00d85 bore, M3 grub, mass opposite the pin \u2248 50% of the con-rod+piston at the pin radius"
  },
  {
   "name": "crank-web-stroke20",
   "step": "/files/hardware/counterweighted-cranks/crank-web-stroke20.step",
   "stl": "/files/hardware/counterweighted-cranks/crank-web-stroke20.stl",
   "note": "crank web (bar crank) 20 mm stroke, \u00d85 bore with set-screw hub, \u00d83 pin; two make a full crankshaft throw"
  },
  {
   "name": "cw-crank-disc-stroke25",
   "step": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke25.step",
   "stl": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke25.stl",
   "note": "counterweighted crank disc, 25 mm stroke (pin at 12.5), \u00d85 bore, M3 grub, mass opposite the pin \u2248 50% of the con-rod+piston at the pin radius"
  },
  {
   "name": "crank-web-stroke25",
   "step": "/files/hardware/counterweighted-cranks/crank-web-stroke25.step",
   "stl": "/files/hardware/counterweighted-cranks/crank-web-stroke25.stl",
   "note": "crank web (bar crank) 25 mm stroke, \u00d85 bore with set-screw hub, \u00d83 pin; two make a full crankshaft throw"
  },
  {
   "name": "cw-crank-disc-stroke30",
   "step": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke30.step",
   "stl": "/files/hardware/counterweighted-cranks/cw-crank-disc-stroke30.stl",
   "note": "counterweighted crank disc, 30 mm stroke (pin at 15.0), \u00d85 bore, M3 grub, mass opposite the pin \u2248 50% of the con-rod+piston at the pin radius"
  },
  {
   "name": "crank-web-stroke30",
   "step": "/files/hardware/counterweighted-cranks/crank-web-stroke30.step",
   "stl": "/files/hardware/counterweighted-cranks/crank-web-stroke30.stl",
   "note": "crank web (bar crank) 30 mm stroke, \u00d85 bore with set-screw hub, \u00d83 pin; two make a full crankshaft throw"
  },
  {
   "name": "bolt-on-counterweight-r15",
   "step": "/files/hardware/counterweighted-cranks/bolt-on-counterweight-r15.step",
   "stl": "/files/hardware/counterweighted-cranks/bolt-on-counterweight-r15.stl",
   "note": "bolt-on counterweight arc, outer R30... (R30 OD, 120\u00b0), 3 \u00d7 M3; add to any flywheel or disc opposite the pin"
  },
  {
   "name": "bolt-on-counterweight-r20",
   "step": "/files/hardware/counterweighted-cranks/bolt-on-counterweight-r20.step",
   "stl": "/files/hardware/counterweighted-cranks/bolt-on-counterweight-r20.stl",
   "note": "bolt-on counterweight arc, outer R40... (R40 OD, 120\u00b0), 3 \u00d7 M3; add to any flywheel or disc opposite the pin"
  },
  {
   "name": "bolt-on-counterweight-r25",
   "step": "/files/hardware/counterweighted-cranks/bolt-on-counterweight-r25.step",
   "stl": "/files/hardware/counterweighted-cranks/bolt-on-counterweight-r25.stl",
   "note": "bolt-on counterweight arc, outer R50... (R50 OD, 120\u00b0), 3 \u00d7 M3; add to any flywheel or disc opposite the pin"
  }
 ]
}