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Cast Acrylic Sheet
Pixel

Ṣẹ́dá nipasẹ̀

Pixel

22. Oṣù Kẹsàn 2026FI
2
0
0
0
0

Cast Acrylic Sheet

Otto Röhm had worked on acrylic chemistry since his 1901 doctorate. His firm first used polymethacrylate as the sticky middle layer of laminated safety glass - and noticed that the polymer came away from the glass plates cleanly, leaving a clear sheet as smooth as the glass. Sold from 1933 as Plexiglas, the sheet went into aircraft canopies within the decade. **US 2,154,639**, "Process for the manufacture of polymerization products", Röhm and Bauer, assigned to Röhm & Haas, filed 4. December 1935, granted 18. April 1939: methacrylic esters polymerised between sheets of glass and then separated from them, for "glass substitutes" whose faces are "as highly polished as the surfaces of the glass itself". **You use that polish**: an edge-lit sign whose engraving glows while the smooth faces stay dark, and two heat-bent offcuts that show how tight a bend the light survives.
Olùbẹ̀rẹ̀
3 hours

Ìlànà

1

Cut the panel

Keep the protective film on. Score 3 mm cast acrylic 200 x 120 mm with the utility knife against a ruler, 8 to 10 passes, then snap it over the bench edge. Cut two 100 x 30 mm offcuts the same way.

Àwọn ohun èlò fún ìgbésẹ̀ yìí:

Pẹlẹbẹ AkrílíìkìPẹlẹbẹ Akrílíìkì1 ẹyọ

Àwọn irinṣẹ́ tí a nílò:

Ọ̀bẹ iṣẹ́Ọ̀bẹ iṣẹ́
Ìwọ̀n IrinÌwọ̀n Irin
Gílásì Ààbò Tí Ó Mọ́Gílásì Ààbò Tí Ó Mọ́
2

Polish the light edge

Sand the 120 mm bottom edge flat, then run the Micro-Mesh grits in order until it is clear. Light enters here; a frosted edge scatters it at the door.

Àwọn irinṣẹ́ tí a nílò:

Ètò Ìfọwọ́ra Àwọ̀n Kékeré (Ìwọ̀n 9)Ètò Ìfọwọ́ra Àwọ̀n Kékeré (Ìwọ̀n 9)
3

Engrave the back

Peel the back film. Draw your design on paper, tape it under the sheet, and trace it with the engraving point at medium speed, light pressure.

Àwọn irinṣẹ́ tí a nílò:

Ohun èlò oníyípo (irú Dremel)Ohun èlò oníyípo (irú Dremel)
Orí ohun ìgbẹ́Orí ohun ìgbẹ́
Gílásì Ààbò Tí Ó Mọ́Gílásì Ààbò Tí Ó Mọ́
4

Slot the base

Cut a pine block 160 x 60 x 40 mm. Saw two parallel kerfs 3.5 mm apart, 15 mm deep, along its length and chisel out between them. Chisel a channel underneath for the LED strip to shine up into the slot.

Àwọn ohun èlò fún ìgbésẹ̀ yìí:

Pákó igi pinePákó igi pine1 ẹyọ

Àwọn irinṣẹ́ tí a nílò:

Ayùn Ọwọ́Ayùn Ọwọ́
Ìdìpọ̀ àyà igiÌdìpọ̀ àyà igi
5

Light it

Strip 5V, GND and DIN to the Uno's 5V, GND and D6. Install the Adafruit NeoPixel library and upload. Stand the panel in the slot.
edge_lit_panel.inocpp
// Edge-lit acrylic panel - batch 98, US 2,154,639
// A short WS2812B strip under the panel's bottom edge. Data -> D6 through the strip's own input.
#include <Adafruit_NeoPixel.h>

const int PIN = 6;
const int COUNT = 8;          // LEDs under the 120 mm edge
Adafruit_NeoPixel strip(COUNT, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  strip.begin();
  strip.setBrightness(60);    // keep well under full power when run from USB
}

void loop() {
  // slow colour wheel: the engraving glows, the polished faces stay dark
  for (long hue = 0; hue < 65536; hue += 256) {
    strip.fill(strip.gamma32(strip.ColorHSV(hue)));
    strip.show();
    delay(30);
  }
}

Àwọn ohun èlò fún ìgbésẹ̀ yìí:

Okùn LED NeopixelOkùn LED Neopixel1 ẹyọ
Ìdìpọ̀ okùn Dupont (akọ-abo)Ìdìpọ̀ okùn Dupont (akọ-abo)1 ìtò

Àwọn irinṣẹ́ tí a nílò:

Arduino Uno R3Arduino Uno R3
SparkFun Cerberus USB Cable - 1.8 meterSparkFun Cerberus USB Cable - 1.8 meter
6

Bend two offcuts

Heat an offcut along a line on the strip heater, turning it over every 30 seconds, until it flexes. Bend it 90° round a 6 mm dowel and hold until cool. Bend the second round a 20 mm dowel.

Àwọn ohun èlò fún ìgbésẹ̀ yìí:

Èèkàn igiÈèkàn igi1 ẹyọ

Àwọn irinṣẹ́ tí a nílò:

Ẹ̀rọ ìgbóná ìlà fún akirilikiẸ̀rọ ìgbóná ìlà fún akiriliki
Ìbọ̀wọ́ wẹ́lídìnÌbọ̀wọ́ wẹ́lídìn
7

Trace the beam

In a dim room shine the laser pointer into the end of each bent strip, never towards anyone's eyes. See where light escapes at the bend, and compare with the notebook.

Àwọn irinṣẹ́ tí a nílò:

Atọ́ka LeserAtọ́ka Leser
8

Critical angle and bends

Ń ṣí ìwé Jupyter…
9

History & Context

**What the patent specifies:** methacrylic esters polymerised between glass sheets and separated, giving a glass substitute with glass-polished faces. **Modern build (derived):** commercial cast acrylic sheet, cut and heat-bent. Cast sheet is still made between glass plates; cheaper extruded sheet came later and is softer and more prone to crazing. The limits: acrylic scratches, cracks if drilled carelessly, crazes when solvents or stress meet, and burns.
Ìgbésẹ̀ 9 - Image 1

Àwọn ohun-èlò

5

Àwọn irinṣẹ́ tó nílò

13

Blueprint tó jọra

Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà

Polycarbonate

Polycarbonate

láti ọwọ́ PennyDK

Ìmọ̀ Ẹ̀rọ

0
0
0
0
0
0
Laminated Safety Glass

Laminated Safety Glass

láti ọwọ́ MaryFI

Kẹ́míkà

37
0
0
0
0
0

CC0 Àgbègbè Gbogbogbò

Blueprint yìí ti jáde lábẹ́ CC0. O lè ṣe àdàkọ, yí padà, pín, àti lò láìsí ìyọ̀ǹda.

Ṣàtìlẹ́yìn Olùṣẹ́dá nípa rírà àwọn ọjà nipasẹ̀ Blueprint wọn Ẹ̀san Olùṣẹ́dá tí àwọn Olùtajà gbé kalẹ̀, tàbí ṣẹ̀dá àtúnṣe tuntun ti Blueprint yìí kí o sì fi sínú Blueprint rẹ gẹ́gẹ́ bí ìsopọ̀ láti pín owó-wíwọlé.

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