A 300W CO2 laser cutting acrylic sheet requires parameters adjusted by sheet thickness and cutting accuracy. The core parameter ranges and specifications are as follows.
Sheet compatibility basics
It suits mainstream cast acrylic sheets with a thickness range of 3 to 25 mm. Extruded acrylic has higher internal stress. Lower power and reduced cutting speed are needed at the same time to avoid edge chipping.
The sheet surface must be clean, with no dust or oil. Otherwise, spot energy drops, or the cut face gets pockmarks.
Core process parameters
(1) Laser power and output mode
For a 300W laser, the actual effective output power is recommended at 180 to 280W. Too high power causes excessive thermal decomposition of acrylic, producing burn marks and heavy smoke. Too low power cannot cut through effectively.
Match power by sheet thickness: 200 to 250W for 3 to 8 mm, 250 to 280W for 10 to 18 mm, and fine-tune to 270 to 290W for 20 to 25 mm.
Use continuous wave output for normal cutting. For high-precision cutting, switch to pulse mode with a frequency of 5 to 10 kHz to reduce the heat-affected zone.
We can machine custom nozzles, fixtures, and other precision parts for laser cutting machines from customer drawings, for single-piece or low-volume production.
(2) Cutting speed
The normal cutting speed range is 30 to 150 mm/s. For every 5 mm increase in thickness, reduce speed by 30% to 40%.
For high-precision cutting with tolerance ≤±0.1 mm, reduce cutting speed by another 20%. Keep the heat-affected zone within ≤0.1 mm to avoid overburning or uneven cut edges.
(3) Assist gas and parameters
Prefer compressed air or high-purity nitrogen. Set supply pressure at 0.4 to 0.6 MPa. Nitrogen greatly reduces carbonization on the cut face and improves transparency. It suits high-value transparent acrylic processing.
Do not use oxygen as assist gas. Oxygen intensifies acrylic burning, produces heavy black smoke, and causes local over-carbonization of the sheet.
Use a nozzle diameter of 1.5 to 2.5 mm. Keep the distance between the nozzle and sheet surface at 5 to 10 mm to ensure the gas flow covers the kerf accurately.
(4) Focal length and focus position
Use a 5.0 to 7.5 inch ZnSe focusing lens for normal work. Set the focus 0.5 to 1 mm below the sheet top surface to maximize spot energy density.
When cutting thick sheets of ≥15 mm, lower the focus to one third of the sheet thickness to improve cutting penetration.
Safety and compliance requirements
The cutting site needs a negative pressure exhaust system to remove methyl methacrylate smoke from acrylic thermal decomposition in time.
Operation must be done by certified laser equipment operators. Avoid looking directly at the laser beam to prevent eye burns.
Our custom precision component machining capability is not limited to laser cutting equipment. Beyond cutting nozzles, fixtures, and protective lens holders, we also machine yacht precision components, RC car structural parts, and non-standard parts for medical devices, food machinery, and textile machinery. Hansheng Automation works from customer drawings and production quantities to deliver single-piece or low-volume precision machining.
