{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "face-spiral-feed-rack-m1-6t-w8",
 "name": "Feed rack for a face spiral, module 1, 6 teeth, 19.05 × 8 × 7, curved teeth",
 "kind": "modern",
 "category": "Mechanisms",
 "group": "Screws & feeds",
 "year": null,
 "question": "What rack runs on a face spiral?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "feed rack",
  "scroll rack",
  "curved tooth rack",
  "cremallera de avance para espiral frontal",
  "Vorschubzahnstange für Spiralscheibe"
 ],
 "overall_mm": {
  "length": 19.05,
  "width": 7,
  "height": 8
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/face-spiral-feed-rack-m1-6t-w8/",
 "sheet_txt": "https://xemstudio.com/objects/face-spiral-feed-rack-m1-6t-w8/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 19.05,
   "width": 7,
   "height": 8
  },
  "notes": [
   "6-tooth rack of module 1 (pitch 3.14 mm), 19.05 mm long, 8 wide, teeth 2.25 mm deep (tip at +1, root at -1.25 from the pitch line), body 6 mm below the pitch line. Generated by the spiral rib: in each of seven planes across the width the rib's section was swept past the rack and the envelope taken, so the teeth are straight-flanked (20°) but curved along the rack's width, following the spiral's curvature (the tooth at the edges of the face sits about 0.3 mm farther along than at the middle). The rack ends in the middle of a space at both ends.",
   "Slides radially over the disc's face, its teeth pointing at the face; one turn of the disc moves it one pitch.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "module",
     "1"
    ],
    [
     "teeth",
     "6"
    ],
    [
     "length",
     "19.05 mm"
    ],
    [
     "width",
     "8 mm"
    ],
    [
     "tooth depth",
     "2.25 mm"
    ],
    [
     "body",
     "6 mm below the pitch line"
    ]
   ]
  }
 },
 "sheet_text": "Feed rack for a face spiral, module 1, 6 teeth, 19.05 × 8 × 7, curved teeth — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/face-spiral-feed-rack-m1-6t-w8/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Xem Studio design following Brown's figure (1868); true size, no printing allowance\nCatalog version: 2026-10-20\n\nOverall (mm): length 19.05, width 7.0, height 8.0\n- 6-tooth rack of module 1 (pitch 3.14 mm), 19.05 mm long, 8 wide, teeth 2.25 mm deep (tip at +1, root at -1.25 from the pitch line), body 6 mm below the pitch line. Generated by the spiral rib: in each of seven planes across the width the rib's section was swept past the rack and the envelope taken, so the teeth are straight-flanked (20°) but curved along the rack's width, following the spiral's curvature (the tooth at the edges of the face sits about 0.3 mm farther along than at the middle). The rack ends in the middle of a space at both ends.\n- Slides radially over the disc's face, its teeth pointing at the face; one turn of the disc moves it one pitch.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\nmodule  1\nteeth  6\nlength  19.05 mm\nwidth  8 mm\ntooth depth  2.25 mm\nbody  6 mm below the pitch line\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala\n- 507movements.com: Brown's movement No. 99: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_099.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/face-spiral-rack-feed-mechanism/\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/face-spiral-feed-rack-m1-6t-w8/index.json\nAPI: https://xemstudio.com/api/geometry?object=face-spiral-feed-rack-m1-6t-w8\n",
 "sources": [
  {
   "publisher": "Henry T. Brown (1868, public domain)",
   "title": "Five Hundred and Seven Mechanical Movements — scan on archive.org",
   "url": "https://archive.org/details/fivehundredseven00browiala",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "507movements.com",
   "title": "Brown's movement No. 99: figure, his text and an animation",
   "url": "https://507movements.com/mm_099.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Xem Studio",
   "title": "drawing",
   "url": "https://xemstudio.com/objects/face-spiral-rack-feed-mechanism/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "face-spiral-rack-feed-mechanism"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "What rack runs on a face spiral?",
   "a": "6-tooth rack of module 1 (pitch 3.14 mm), 19.05 mm long, 8 wide, teeth 2.25 mm deep (tip at +1, root at -1.25 from the pitch line), body 6 mm below the pitch line. Generated by the spiral rib: in each of seven planes across the width the rib's section was swept past the rack and the envelope taken, so the teeth are straight-flanked (20°) but curved along the rack's width, following the spiral's curvature (the tooth at the edges of the face sits about 0.3 mm farther along than at the middle). The rack ends in the middle of a space at both ends."
  }
 ],
 "files_license": {
  "name": "Xem Studio Design License",
  "holder": "Xem Studio",
  "url": "https://xemstudio.com/license/",
  "note": "Xem Studio's own design: free to use, print, modify and sell things made from it; not to be republished or redistributed as files."
 },
 "offers": [
  {
   "file": "face-spiral-feed-rack-m1-6t-w8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/face-spiral-feed-rack-m1-6t-w8/face-spiral-feed-rack-m1-6t-w8.step",
   "stl": "https://xemstudio.com/files/hardware/face-spiral-feed-rack-m1-6t-w8/face-spiral-feed-rack-m1-6t-w8.stl",
   "note": "rack along X (x -9.62..9.42), teeth pointing +Y, pitch line y = 0, width z -4..4"
  }
 ],
 "markdown": "https://xemstudio.com/objects/face-spiral-feed-rack-m1-6t-w8/index.md"
}