Rap

{
  "id": "MLC-T-IND-004696",
  "term": "Rap",
  "field": "Industrial and trades",
  "definition": "To strike a casting pattern embedded in a sand mold with light blows from a mallet or vibrator just before it is withdrawn. This action slightly enlarges the mold cavity by compressing the surrounding sand, creating clearance for the pattern's removal without damaging the mold walls. Excessive rapping can lead to an oversized casting that is dimensionally inaccurate, while insufficient rapping may cause the mold to break.",
  "subject": "Metalworking",
  "see_also": [
    "rapper"
  ],
  "translations": {
    "de": "Abklopfen",
    "es": "golpear",
    "fr": "démouler"
  },
  "url": "https://mlchart.com/terminology/industrial/rap/"
}