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
Acrylic Block: Methyl Methacrylate Syrup Cast in Layers between Glass
A thick acrylic block cannot be cast flawless in one pour. Tattersall (ICI, US 2,071,907, 1937) built it up in layers: pour 1/2 inch of syrup on a level glass plate, let it set for a day at room temperature, pour the next 1/2 inch on top, cover with a second glass plate, wait another day, then heat the sandwich at 80 °C. Each 1/2 inch layer shrinks to about 1/3 inch. The glass gives both faces a finished polish with no grinding.
The picture: our diagram.
Àárín
3 days
Ìlànà
1
1
Level the bottom plate
Level the bottom plate
Set a glass plate on a ledge in a wooden frame, on a body of plaster of Paris, and level it carefully. The example sheet was 10 by 18 inches.
Àwọn irinṣẹ́ tí a nílò:
Fèrèsé dígí
Fírémù igi
Pilasita ti Paris
Ohun ìwọ̀n ìdọ́gba 1.5 m2
2
Pour the first 1/2 inch
Pour the first 1/2 inch
Pour room-temperature syrup 1/2 inch deep (about 1.5 litres for 10 by 18 inches; our figure). Cover against dust, but do not put the top plate on yet. Leave 24 hours at about 20 °C.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Sírọ́ọ̀pù methyl methacrylate3 lÀwọn irinṣẹ́ tí a nílò:
Ìbọ̀wọ́ rọ́bà
Ẹ̀rọ Ìwọ̀n Ooru Yàrá Ìwádìí3
3
Pour the next layer and cover
Pour the next layer and cover
Pour a second 1/2 inch layer on the first. Lower the top glass plate onto it so it rests on the syrup and keeps pressing on it. Leave another 24 hours at about 20 °C. For a thicker block repeat the layers, a day apart, and put the plate on the last one.
Àwọn irinṣẹ́ tí a nílò:
Fèrèsé dígí4
4
Heat at 80 °C
Heat at 80 °C
Take the glass sandwich out of the frame and heat it for three hours at 80 °C to finish the polymerisation.
Àwọn irinṣẹ́ tí a nílò:
Ààrò ìgbẹ̀Ẹ̀rọ Ìwọ̀n Ooru Yàrá Ìwádìí
Ìbọ̀wọ́ Tí Ń Fara Da Ooru5
5
Spring off the glass
Spring off the glass
Spring the glass plates off the block with a knife blade. Both faces come out smooth and polished.
Àwọn irinṣẹ́ tí a nílò:
Ọ̀bẹ Iṣẹ́ Ọwọ́Ìbọ̀wọ́ rọ́bàÀwọn ohun-èlò
1Àwọn irinṣẹ́ tó nílò
9- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
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CC0 Àgbègbè Gbogbogbò
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