How To Cut Perspex With Circular Saw?

Perspex is a type of acrylic plastic that is lightweight, shatter-resistant, and widely used in various applications, such as signage, displays, glazing, and DIY projects. While it is easy to handle and shape, cutting Perspex requires proper tools and techniques to achieve a clean and precise cut. In this article, we will discuss how to cut Perspex with a circular saw, one of the most effective and efficient methods for cutting Perspex sheets. We will cover the necessary tools and equipment, safety precautions, cutting techniques, and tips for achieving a professional finish.


Tools and Equipment Needed


To cut Perspex with a circular saw, you will need the following tools and equipment:

  • A circular saw:A circular saw is a power tool that uses a toothed or abrasive disc or blade to cut various materials, including wood, metal, and plastic. When cutting Perspex, you should use a circular saw with a diamond saw blade, which is specifically designed for cutting hard and brittle materials like acrylic.
  • A diamond saw blade:A diamond saw blade is a circular blade with diamond particles embedded in the metal segments. It is more durable and efficient than a regular saw blade and produces smoother and cleaner cuts. When choosing a diamond saw blade for cutting Perspex, you should consider the diameter, thickness, and tooth count of the blade. The recommended diameter is 7 ¼ inches diamond saw blade or 185mm, which is suitable for most circular saws. The thickness should be thin, usually between 1mm to 3mm, to minimize heat buildup and friction during cutting. The tooth count should be low, around 60 to 80 teeth, to reduce chipping and melting of the Perspex.


  • Clamps or vice grips:Clamps or vice grips are used to secure the Perspex sheet to a stable and flat surface, such as a workbench or sawhorse. This prevents the sheet from shifting or vibrating during cutting, which can cause uneven cuts or cracks.
  • Straightedge or guide rail:A straightedge or guide rail is used to guide the circular saw along a straight line, ensuring a precise and straight cut. You can use a metal ruler, a wooden board, or a specialized guide rail that attaches to the saw base.
  • Safety gear:Cutting Perspex can produce sharp debris, dust, and fumes that can harm your eyes, skin, and lungs. Therefore, you should wear safety gear, including safety glasses, a dust mask, gloves, and a long-sleeved shirt.


Safety Precautions


Before cutting Perspex with a circular saw, you should take the following safety precautions:

  • Read the manual: Read the manual of your circular saw and diamond saw blade to understand their specifications, limitations, and recommended usage. Follow the manufacturer’s instructions for installing and adjusting the blade, setting the cutting depth, and operating the saw.
  • Choose a suitable workspace:Choose a well-ventilated and well-lit workspace that is free of clutter, moisture, and flammable materials. Avoid cutting Perspex near heat sources, open flames, or electrical outlets.
  • Secure the Perspex sheet:Use clamps or vice grips to secure the Perspex sheet to a flat and stable surface, such as a workbench or sawhorse. Ensure that the sheet is positioned firmly and level, and that there is enough clearance for the saw blade.
  • Wear safety gear:Wear safety glasses, a dust mask, gloves, and a long-sleeved shirt to protect yourself from sharp debris, dust, and fumes. Avoid loose clothing or jewelry that can get caught in the saw blade.
  • Start with a test cut:Before cutting your Perspex sheet, make a test cut on a scrap piece of Perspex to ensure that the saw blade is properly adjusted and the cutting speed is appropriate. Adjust the cutting depth and speed as necessary to achieve a clean and smooth cut.


Cutting Techniques


To cut Perspex with a circular saw, follow these steps:

  1. Measure and mark the cutting line:Use a ruler, a protractor, or a specialized marking tool to measure and mark the cutting line on the Perspex sheet. Ensure that the line is straight and accurate.
  2. Attach the guide rail:If you are using a guide rail, attach it to the saw base according to the manufacturer’s instructions. Ensure that the rail is aligned with the cutting line.


  1. Set the cutting depth:Adjust the cutting depth of the saw blade according to the thickness of the Perspex sheet. The blade should protrude slightly below the bottom surface of the sheet.
  2. Turn on the saw: Turn on the circular saw and wait for the blade to reach its maximum speed before starting the cut.
  3. Position the saw:Position the saw blade at the beginning of the cutting line, with the blade edge touching the surface of the Perspex sheet.
  4. Start the cut:Push the saw forward along the guide rail or the cutting line, applying steady and even pressure. Avoid forcing the saw or tilting it, as this can cause the blade to bend or break. Keep the saw blade moving at a consistent speed and angle, and ensure that the Perspex sheet is firmly held in place.
  5. Complete the cut:Continue cutting along the guide rail or the cutting line until you reach the end of the sheet. Slow down the saw as you approach the end to prevent the Perspex from vibrating or cracking.
  6. Remove the saw blade:Turn off the saw and remove the blade from the saw. Use a brush or compressed air to clean the blade and the saw base from any debris or dust.


Tips for Achieving a Professional Finish


To achieve a professional finish when cutting Perspex with a circular saw, consider these tips:

  1. Use a sharp and high-quality diamond saw blade that is suitable for Perspex.
  2. Cut the Perspex sheet with a slow and steady speed, and avoid rushing or stopping during the cut.
  3. Ensure that the Perspex sheet is firmly secured to the work surface and does not vibrate or shift during cutting.
  4. Use a guide rail or a straightedge to achieve a straight and precise cut.
  5. Apply a low-friction lubricant, such as silicone spray or wax, to the saw blade and the cutting line to reduce heat buildup and chipping.
  6. Allow the Perspex sheet to cool down after cutting before removing it from the work surface or applying any adhesive.




Cutting Perspex with a circular saw requires the right tools, equipment, and techniques to achieve a clean, straight, and precise cut. By following the tips and precautions outlined in this article, you can safely and effectively cut Perspex sheets with a diamond saw blade and a circular saw. Remember to wear safety gear, secure the Perspex sheet, and use a guide rail or a straightedge to achieve a professional finish. With practice and patience, you can master the art of cutting Perspex and create various projects that showcase its versatility and beauty.


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