Ethan Clarke
Laser cutting is a popular method for cutting plastic due to its precision, versatility, and ability to handle intricate designs. It offers clean cuts, minimal waste, and consistent results. However, one challenge that arises is how to flatten plastic pieces after laser cutting to ensure a smooth finish. Various techniques and software tools, such as CATIA and Fusion 360, can be employed to flatten plastic surfaces before cutting. This process involves converting the plastic body into sheet metal and then using the flatten option or creating a flat reference surface by extruding from the cut edge. Additionally, it is crucial to consider the type of plastic being cut and the appropriate laser cutter, such as CO2 lasers for thicker plastics or diode lasers for thinner plastics, to avoid issues like burned edges or toxic fumes.
| Characteristics | Values |
|---|---|
| Software | CATIA |
| Plugins | FiberSim |
| Function | Flatten compound curves, introduce darts, stress modelling |
| Sheet metal tools | Define the thickness of the material |
| Unwrap function | Decide where to place the seam |
| Rip command | Create a flat pattern |
| Extrude | Create a flat reference/stationary face |
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What You'll Learn
- Use sheet metal tools and define the thickness of the material in the laser cutter
- Use cone calculators to get a flat dxf ready to cut
- Use the sheet metal section of Fusion 360
- Avoid burning the edges by coating the plastic with oil or submerging it in water
- Use transfer paper on both sides of the plastic and peel it off
Use sheet metal tools and define the thickness of the material in the laser cutter
When using sheet metal tools to flatten plastic after laser cutting, it is important to consider the thickness of the material and the type of laser cutter being used. Laser cutters use a beam of light to cut or engrave plastic, and the energy of the laser beam is high enough to vaporize the material. The thickness of the material is a crucial factor in the laser cutting process, as it determines the type of laser cutter that can be used and the overall success of the flattening process.
The type of laser used in the cutter defines the thickness of the material it can handle. CO2 lasers, for example, are commonly used for cutting and engraving plastics. They are low-power, inexpensive, and efficient, making them suitable for a wide range of materials, including wood, cardboard, leather, acrylic, glass, and some plastics. However, for thicker plastics or when more precise cuts are required, higher-power lasers, such as neodymium lasers, may be needed. These lasers have a smaller wavelength, resulting in higher intensity, which enables them to cut through thicker materials.
The thickness of the plastic sheet plays a significant role in managing internal stresses within the material. When materials are manufactured and transported, they are often rolled up to improve efficiency. This process introduces thermal and mechanical stresses that can lead to warping when the material is flattened for laser cutting. By defining the thickness of the plastic sheet, you can better predict and manage these internal stresses, reducing the likelihood of warping.
Additionally, the thickness of the material impacts the functionality and aesthetics of the final product. Thinner features tend to be more brittle and prone to breakage, while thicker materials may exhibit issues like edge micro-burrs. Therefore, selecting the appropriate thickness for your specific application is essential to achieving the desired outcome.
To flatten plastic after laser cutting effectively, it is crucial to consider the thickness of the material and choose the right type of laser cutter. By understanding the relationship between the laser type and the material thickness, you can optimize the flattening process, minimize warping, and achieve the desired results in terms of both functionality and appearance.
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Use cone calculators to get a flat dxf ready to cut
When cutting plastic with a laser, it's important to be aware of the type of plastic you're using, as some plastics release toxic gases when exposed to lasers. Common plastics that can be cut and engraved with a laser cutter include Polyvinyl chloride (PVC), which is used in a wide range of products. However, it is unsafe to cut PVC with a laser machine as it produces harmful smoke containing hydrochloric acid, vinyl chloride, ethylene dichloride, and dioxin. These vapors and fumes are toxic and carcinogenic, so proper ventilation and safety precautions are crucial.
To flatten plastic after laser cutting, one method is to use a cone calculator, specifically the Flat Pattern Cone Calculator app. This app is designed to calculate the parameters for developing a full, half, truncated, concentric, or eccentric cone, among other types. It offers precision and ease in sheet metal fabrication, providing advanced calculations at your fingertips. The app is available for download on Android devices through Google Play.
Once you've installed the app and accepted the necessary permissions, you can utilize it to obtain a flat DXF file ready for cutting. The app allows you to save the flat pattern of a straight or truncated cone as a DXF file, which you can then open with any CAD program, such as AutoCAD. This file will contain the necessary information and dimensions for constructing the cone, making the cutting and assembling process straightforward.
To use the DXF file for cutting, you can open it on a laser or CNC machine using compatible software. On Android phones, you can use applications like AutoCAD, DWG FastView, SchemataCAD viewer DWG/DFX, or AutoDWG DWGSee to access and utilize the DXF file. With the file loaded, you can proceed with the cutting process, ensuring that the plastic sheet is properly calibrated and secured for accurate results.
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Use the sheet metal section of Fusion 360
To flatten plastic after laser cutting, you can use the sheet metal section of Fusion 360. This method involves using the loft flange feature and selecting the flat pattern that is created.
Firstly, sketch the profile of the cone using the sheet metal tools and define the thickness of your material in the laser cutter. Then, use surface tools to revolve and thicken your sketch, using the thicken dimension to drive rules in sheet metal.
Next, convert the solid cone with thickness to a sheet metal part and unfold it. You may need to use some "weird tricks" with microscopic gaps to keep the cone from being fully revolved.
Finally, perform a cut-extrude of 0.1mm to separate the solid and allow it to flatten. This method may require some experimentation and adjustments to get the desired results.
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Avoid burning the edges by coating the plastic with oil or submerging it in water
When laser cutting plastic, it's important to be aware of the type of plastic you are using and the potential for toxic gases to be released. For example, polyvinyl chloride (PVC) is a common plastic that should not be cut with a laser machine as it produces harmful smoke.
To avoid burning the edges of plastic when laser cutting, one suggestion is to coat the plastic with oil or submerge it in water. However, it's important to note that this method may not be suitable for all types of plastics and could require some experimentation. One source suggests that coating the plastic with oil or submerging it in water is only suitable for someone who knows a lot about lasers.
Before attempting to cut plastic, it is recommended to test the speed and power settings to ensure optimal performance and reduce the chances of burning. This can be done by performing a materials test on an offcut. If the power is set too high and the speed is too low, the edges of the plastic will appear black and charred. Adjusting the vector current can also help reduce edge burn.
Another method to prevent burning is to cover the plastic with masking tape before cutting. This helps to avoid staining on the edges of the engraving, as the marks will be left on the tape instead of the plastic. Transfer tape can also be used, although it is more costly.
If you are laser cutting wood, damping the wood by briefly soaking it in water before engraving can help prevent burn marks. However, this method is not recommended for plastic.
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Use transfer paper on both sides of the plastic and peel it off
When cutting plastic with a laser, it is important that the material is flat. Warping can cause inconsistencies in the cut. One way to flatten plastic is to use transfer paper. This method involves applying transfer paper to both sides of the plastic and then peeling it off.
First, cut the transfer paper to the same size as the plastic sheet. Then, place the plastic sheet between two pieces of the transfer paper, making sure that the paper covers the entire surface of the plastic.
Once the paper is in place, use a roller or your hands to smooth out any air bubbles or wrinkles. It is important to ensure that the transfer paper is securely adhered to the plastic sheet.
Finally, carefully peel off the transfer paper from both sides of the plastic sheet. The plastic should now be flatter and ready for laser cutting.
This method is also recommended for preventing burning on the surface of plywood when using a laser cutter.
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Frequently asked questions
You can use cone calculators online to get a flat dxf ready to cut. Just input the dimensions of the final cone. You can also model it in 3D by lofting and shelling in a sheet metal environment, then performing a cut-extrude of 0.1 mm to separate the solid and flatten it.
You can use sheet metal tools and define the thickness of your material in the laser cutter. There should be an unwrap function, and you can decide where you want the seam.
You can use transfer paper on both sides of the plastic, which can then be peeled off. You can also clean the edges with rubbing alcohol (isopropyl alcohol).
