{
  "type": "siegemachines:siege_workbench",
  "pattern": [
    " b ",
    "bob",
    " b "
  ],
  "key": {
    "b": {
      "item": "siegemachines:beam",
      "count": 1
    },
    "o": {
      "tag": "forge:rods/wooden",
      "count": 8
    }
  },
  "result": {
    "item": "siegemachines:wheel",
    "count": 2
  }
}