Acrylic relief engraving creates an elegant effect for trophies or similar applications. When relief engraving acrylic, it is very important to work without any additional Air Assist (=OFF) and with a z-offset value. This is to help the material avoid becoming cloudy or acquiring a milky-white discolouration.
The Engraving Process
(Data is based upon the use of the Speedy 360, 80-Watt laser machine): Use a slow engraving speed, combined with high power (p90%, v10%), and switch off the Air Assist when engraving. This will give the material sufficient time to melt and, depending on your laser's performance, produce an excellent texture in the first pass. More passes will create a deeper, 3D engraving effect. Remember, it is equally important to use a z-offset value of +2mm - +4mm. This will preserve the transparency of the acrylic.
Clean the completed acrylic workpiece underneath running water with a toothbrush to remove any remaining dust particles inside the tiny cracks and grooves.