{
  "units":"mm",
  "carton_widths":[80,120,180],
  "carton_length":120,
  "carton_height":60,
  "belt_top":90,
  "running_clearance_per_side":2,
  "rail_length":500,
  "rail_height":30,
  "rail_bottom":95,
  "rail_thickness":6,
  "wear_thickness":3,
  "station_x":[-180,180],
  "shaft_diameter":20,
  "shaft_center_z":183,
  "shaft_length":400,
  "carriage_bore":20.20,
  "index_pin_diameter":8,
  "index_hole_diameter":8.15,
  "frame_outer_width":450,
  "tolerances":{
    "index_hole_position":0.05,
    "index_pin_position":0.05,
    "pin_hole_radial_clearance":0.09,
    "wear_allowance":0.10,
    "carriage_to_rail":0.08,
    "wear_strip_thickness":0.10,
    "carton_half_width":0.50
  }
}