IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Sandpaper from Sand, Hide Glue and Paper
A coated abrasive is grit glued to a backing. The first recorded one, in 13th-century China, bonded crushed shells, seeds and sand to parchment with natural gum. Here clean quartz sand is crushed, sieved into grades and scattered on paper brushed with warm hide glue.
Sieve mesh only roughly matches a shop grit number: real P grades are set by ISO 6344. Quartz grit on hide glue wears faster than garnet or aluminium oxide paper, and water softens the glue, so use it dry.
Olùbẹ̀rẹ̀
1 hour, plus a day drying
Ìlànà
1
1
Crush the sand
Crush the sand
With a dust mask on, crush clean quartz sand in the mortar, a few spoonfuls at a time.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Iyanrìn Kuátsì300 gÀwọn irinṣẹ́ tí a nílò:
Odó àti Ọmọ Odó
Ìbòjú Eruku2
2
Sieve into grades
Sieve into grades
Sieve through the 60, 80 and 120 mesh sieves stacked coarse on top. Keep what each sieve holds in its own labelled jar: coarse, medium and fine.
Àwọn irinṣẹ́ tí a nílò:
Ìṣẹ́ mesh 60
Ajọ̀ onímẹ́ṣì 80
Ajọ Ojú 120
Ìgò Gílásì OnídìíÌbòjú Eruku3
3
Warm the glue
Warm the glue
Soak hide glue granules in water, then warm them in a double boiler to about 60 °C until runny. Do not let it boil.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìlẹ̀mọ́ awọ ẹranko50 g
Omi0.1 lítàÀwọn irinṣẹ́ tí a nílò:
Ìkòkò méjì onímí omi
Pátákó Gbígbóná
Ẹ̀rọ ìwọ̀n ooru oníhun tí ó dúró sí inú4
4
Glue the paper
Glue the paper
Brush a thin, even coat of glue over one face of a sheet of strong paper, edge to edge.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bébà3 ewéÀwọn irinṣẹ́ tí a nílò:
Búrọ́ọ̀ṣì ìdìpọ̀5
5
Scatter the grit
Scatter the grit
While the glue is wet, sprinkle one grade of grit thickly over it, press it in with a rolling pin over a clean sheet, and let it set for a minute.
Àwọn irinṣẹ́ tí a nílò:
Ọ̀pá ìtẹ̀ ìyẹ̀fun6
6
Shake off and dry
Shake off and dry
Tip the sheet on edge and tap off the loose grit back into its jar. Dry it flat for a day, then label the back with its grade.
Àwọn irinṣẹ́ tí a nílò:
Ìgò Gílásì Onídìí7
7
Test it
Test it
Sand a scrap of softwood ten strokes and look at the scratches. Cut sheets to size.
Àwọn irinṣẹ́ tí a nílò:
Ìṣẹ́ná8
8
Troubleshooting
Troubleshooting
Home-made sandpaper troubleshooting.
Flow
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Àwọn irinṣẹ́ tó nílò
12- Àyè
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- Àyè
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