How to cut carbon fiber

Carbon fiber is highly regarded for its lightweight and high durability, which places it in a key position in automotive, aviation, and sports equipment. Nevertheless, carbon fiber cutting can be problematic; proper tools and particular methods have to be used. Here, you will learn how to cut carbon fiber for maximum safety and performance.

Table of Contents

Characteristics of carbon fiber material.

Cutting Carbon Fibre Sheet
Cutting Carbon Fibre Sheet

Carbon fiber is a lightweight, strong material because of the fragile and strong carbon strands. These strings twine up, forming a yarn. The fiber, in turn, weaves in different styles and fashion patterns. This material is credited for its strength and lightweight. Its outstanding features, among others, make it applicable in most of the fields. They involve aerospace, automobiles, and sports equipment. The fiber’s carbon base is the primary source of its unique properties. This base has a high level of stiffness, and tensile can bear stress. This solid material is also by far the lightest kind. This bundle of features makes it one of the most widely used units in physics.

Challenges in cutting carbon fiber

Cutting carbon fiber involves some unique challenges which require careful attention to detail:

  • Delamination: When cutting carbon fiber composites, the layered structure makes them prone to delamination. The separation of layers can jeopardize the integrity and strength of the material. Thus, it is key to use sharp, suitable tools and optimize cutting parameters like speed and feed rate that can decrease delamination.
  • Abrasive Wear: Carbon fiber is incredibly abrasive leading to rapid tool wear during cutting processes. This wear affects the cut precision and raises operating costs due to frequent replacement of tools. By using tools which are specifically designed for cutting carbon fibre such as diamond coated or solid carbide tools can however help in mitigating this problem.
  • Fiber Fraying: During carbon fiber cuts, edges of either side might get frayed resulting in rough finishes that require additional post-processes such as sanding or sealing. Sharp instruments and good cut methods that minimize tearing are vital for reducing fraying.
  • Dust Generation: Whenever carbon fibre is cut into smaller parts dust is created as fine particles thus creating a health hazard if breathable. It also settles on machines posing potential harm or failure. An effective dust extraction system and personal protective equipment (PPE) including masks and goggles must be used to guarantee workplace safety.
  • Thermal Damage: Some types of cutting such as laser-cutting produce heat that may cause thermal damage on the carbon fiber material thereby altering its properties and possibly weakening it near the cut edges. Heat dissipation techniques should be employed or alternatively other methods that generate minimal heat while cutting so as to avoid thermal damage happening.
  • Tooling Challenges: Specialized tooling often needs to be used when cutting carbon fibers which adds complexity and cost to the machining process. One must therefore select appropriate tools carefully and maintain them regularly in order to achieve high-quality cuts with longer lasting tooling.

Preparation for cutting carbon fiber

Cutting Carbon Fiber by Hand
Cutting Carbon Fiber by Hand

It is vital to read and follow safety guidelines and operating procedures to reduce risk and get ideal cutting outcome Adequate preparation is paramount before cutting carbon fiber for safety and a smooth surface effect. undefined

  1. Select the Appropriate Carbon Fiber Sheet: Knowing and positively select the proper type of carbon fiber sheet for your application, for instance, prepreg or drying carbon fiber sheets. One of the essential things to ponder besides the type of the sheet is the type of cutting method and the tools that you will use.
  2. Inspect the Material: Before cutting, make sure to inspect the carbon fiber sheet to see if there is any potential damage or problems so you will get a high-quality cutting. The damaged materials can lead to cutting out the distorted cuts or even improvement of safety during the cutting process.
  3. Secure the Carbon Fiber: Clamp the carbon fiber with the clamps or a vise to the workbench in such a way that it does not move when it is getting cut. Using strap and padlocks on unstable materials can eliminate errors during cutting or avoidance of certain hazards.
  4. Mark the Cutting Line: Apply adhesive tape or silver marker to outline the region you wish to carve on the fiber composite. The markings should clearly indicate the cutting line so that its cuts can be accurate.
  5. Wear Protective Gear: Protect your eyes and respiratory system by using a dust mask and goggles while working with carbon fiber dust could lead to eye irritation and inhalation. Wearing long gloves will help you to guard your hand from cuts. Always wear assigned personal protective equipment for the cutting stage.

The carbon fiber cutting methods

Rotary cutting tool

use rotary tool to Cut Carbon Fibre Sheet

Rotary tool has rotating tip and refers to a handheld power tool that may have different attachments for certain tasks such as sanding, cutting, grinding and polishing. For instance, there is the Dremel rotary tool and the Proxxon Rotary Tool. These tools are versatile and can be used on a wide range of materials, including carbon fiber.

Using a Rotary Tool to Cut Carbon Fiber:

  • Choose the Right Cutting Wheel: Therefore, use diamond or tungsten carbide cutting wheel because they can effectively cut carbon fiber without getting easily damaged.
  • Begin From Top To Bottom: The cutting wheel of your rotary tool should go above the carbon fiber while slowly making cuts along the marked line.
  • Avoid Overheating: In case you notice that your cutting wheel has overheated, reduce its speed so that you do not destroy your carbon fiber. Overheating it will make it fragile or alter its characteristics.

Saw blade tool

Carbon fibre cutting saw blades are carbide grit-edged tools that prevent chipping and clogging. Diamond coated blade, for instance, gives precision when cutting composite materials.

  • Choose the correct saw blade: Selecting the right saw blade is critical. Opt for a blade with tungsten carbide grit edge. This will reduce the carbon fibers’ fragmentation and clogging during cutting.
  • Position of sawing: During cutting, put your finger half an inch into where you want to cut. There should be extra space for sanding and edging later.
  • Slow Sawing: Cutting must be done slowly along the marked line. The best approach is to keep moving at a steady pace so that the cut through carbon fiber material is very clean without causing damage.

Waterjet cutting carbon fiber


  • No heat affected zone: The process used in waterjet cutting is a cold one which causes no heat-affected zones that may render the carbon fiber properties changed thus retaining them.
  • Highly accurate: Waterjet cutting can deliver extremely precise cuts, resulting in fine edges and can be used to form intricate shapes.
  • It is versatile: Waterjet is capable of slicing through different thicknesses of carbon fiber materials and can be applied widely.


  • Slower speed: This technology cut slower than other methods with implications for increased production costs.
  • Water and abrasion: A lot of water and abrasive materials are essential to water jet cutting thus raising the operating expenses involved.

Operating Precautions:

  • Keeping suitable distance between the nozzle head and the work piece surface will guarantee correct cuts.
  • When using abrasives or employing adjustable water pressure based on the size and hardness of the material made from carbon fibre.
  • Regularly check up on all parts of a machine used for making narrow cuts across metal sheets just so it continues working well,
  • Safety should be considered while performing this activity as high-pressure stream can result into serious injuries.

CNC machine cutting carbon fiber


  • CNC machines have the capacity to control the cutting path precisely, and this guarantees that the carbon fiber parts are dimensionally and shape accurate.
  • Fast Cutting Speed: Comparing with manual cutting, CNC machines can finish cutting tasks quickly thus improving production efficiency.
  • High Automation: The cutting process can be automated on a CNC machine so that it involves less manpower in terms of operation and labor intensity.


  • High Equipment Cost: The acquisition and maintenance costs of CNC machines are relatively higher.
  • Technical Requirements Are High: Operating CNC machines require specific skills and training.
  • Material Waste: During the cutting process there could be some material waste that results from this process.

Operating Precautions:

  • Feed Rate: It should be between 2000-3000 mm/min or according to material thickness and cutting depth adjustment should then be made.
  • Spindle Speed: A speed limit within 18000-24000 rpm is recommended. This assists in minimizing delamination as well as cut damage caused by high spindle speeds.
  • Ensure that there are sharp-cutting tools. Replace or sharpen your knives periodically so as to maintain their effectiveness.
  • Use appropriate cooling lubrication systems to avoid overheating and reduce tool wear.
  • It is necessary to keep the work piece stable. Apply suitable clamps for holding down carbon fiber materials during machining, which prevents its movement and vibration during processing.

Laser cutting carbon fiber


  • High Precision: The laser cutting can make individual cuts that are very precise, thus suitable for intricate designs and fine lines cutting.
  • Non-contact Cutting: This is the non-contact technique of laser cutting which reduces tensions on carbon fiber sheets.
  • Fast and Efficient: In addition to being a quick process, this enhances production efficiency.


  • Heat-Affected Zone: There may be some charring or thermal damage at the edges of the carbon fiber because of a heat affected zone caused by laser cutting.
  • Limited Material Thickness: Can´t handle thicker sheets of carbon fiber material with laser cutting.
  • Safety Risks: During laser cutting, special attention should be given to safety from smoke and laser radiation.

The operating Suggestions for Laser Cutting Carbon Fiber

  • Choose the Appropriate Laser Type: For CO2 lasers or fiber lasers are generally recommended as suitable for cutting carbon fibre mainly because they have sufficient power and provide accurate control respectively.
  • Adjust Laser Parameters: Depending on thickness of carbon fibre and desired quality of cut, modify the following on your laser machine’s software – power, speed, focal length etc.
  • Use Assist Gas: Employ assist gas such as Nitrogen or any other inert gases to reduce heat affected zone (HAZ) and prevent material burning.
  • Minimize the Heat-Affected Zone: To maintain optimal performance as well as integrity of your carbon fibre it will be necessary that you optimize both your laser parameters and your cutting paths while keeping HAZ at minimum levels during processing steps involved in its manufacture using lasers.

Safety Precautions for cutting carbon fiber

Work in a ventilated environment

To work well when you cut carbon fiber, ensure that you do it in a place with good ventilation. Such a practice will help to reduce the risks of inhaling carbon fiber dust which is dangerous.

Use Dust-Free Equipment:

Some of the equipment to be used in this process include vacuum cleaners for capturing the low particles hence making carbon fiber cutting more efficient. This measure helps to maintain cleanliness of your working area and reduces exposure to fine particles.

Shield your skin and eyes

Wear protective clothes and safety glasses for shielding your skin from being scratched by sharp edges as one cuts through carbon fibers. The reason is that they prevent accidents or injuries from happening and thus making the workplace safer.


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