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Grinding Wheel: Vitrified, Clay-Bonded (Machinery's Handbook, 1924)
The common machine-shop wheel: abrasive grains held in a bond of clay and fluxes, moulded and fired until the clay partly melts and vitrifies. Porous and free-cutting, unaffected by water, acids, oils, heat or cold.
Source: Machinery's Handbook (1924), pp. 1101-1102. Unknown: proportions and temperatures. Picture: the handbook's text.
Advanced
100+ hours firing, a week cooling
Instructions
1
1
Mix and mould
Mix and mould
Mix suitable clays and fluxes with the abrasive grain and mould the wheels. Not given: proportions.
Materials for this step:
Aluminium Oxide Abrasive Grit1 piece
Ball Clay1 piece
Feldspar Chunk1 flux
Water1 pieceTools needed:
Mixing Bowl Set
Mold
Wooden Mallet2
2
Fire and cool
Fire and cool
Burn the wheels continuously for 100 hours or more, longer for bigger wheels, raising the heat gradually until the clay partly melts and vitrifies. Cool slowly for a week, guarding against sudden temperature changes; as it cools the clay binds the grains.
Tools needed:
KilnMaterials
4- Placeholder
- 1 piecePlaceholder
- 1 fluxPlaceholder
- 1 piecePlaceholder
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