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Cast Acrylic Sheet
Pixel

Creato da

Pixel

22. settembre 2026FI
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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.
Principiante
3 hours

Istruzioni

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.

Materiali per questo passaggio:

Lastra di acrilicoLastra di acrilico1 pezzo

Strumenti necessari:

TaglierinoTaglierino
Riga in acciaioRiga in acciaio
Occhiali di sicurezza trasparentiOcchiali di sicurezza trasparenti
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.

Strumenti necessari:

Kit di levigatura a micromaglia (9 grane)Kit di levigatura a micromaglia (9 grane)
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.

Strumenti necessari:

Utensile rotativo (tipo Dremel)Utensile rotativo (tipo Dremel)
Punta da incisorePunta da incisore
Occhiali di sicurezza trasparentiOcchiali di sicurezza trasparenti
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.

Materiali per questo passaggio:

Tavola di pinoTavola di pino1 pezzo

Strumenti necessari:

Sega a manoSega a mano
Serie di scalpelli da legnoSerie di scalpelli da legno
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);
  }
}

Materiali per questo passaggio:

Striscia di LED NeopixelStriscia di LED Neopixel1 pezzo
Set di cavi Dupont (maschio-femmina)Set di cavi Dupont (maschio-femmina)1 set

Strumenti necessari:

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.

Materiali per questo passaggio:

Spina di legnoSpina di legno1 pezzo

Strumenti necessari:

Riscaldatore a barra per acrilicoRiscaldatore a barra per acrilico
Guanti da saldatoreGuanti da saldatore
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.

Strumenti necessari:

Puntatore laserPuntatore laser
8

Critical angle and bends

Caricamento del notebook 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.
Passo 9 - Image 1

Materiali

5

Strumenti richiesti

13

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