Alexei Volkov
Hole saws are a great way to cut holes in plastic. They are cylindrical saws that can be powered by any corded or cordless drill, and their hollow shape allows for easy removal of waste material. Hole saws come in a variety of sizes, ranging from standard diameters to larger adjustable sizes of up to 300 mm or more. When using a hole saw on plastic, it is important to go slow and steady, especially with thin plastics, to avoid melting or cracking the material. Drilling the hole slowly and in reverse can help prevent melting, and clamping and taping the plastic can ensure a clean cut. For very large holes, it is recommended to use long side-handles and have two operators to ensure safety and accuracy.
Hole saw characteristics for cutting plastic
| Characteristics | Values |
|---|---|
| Hole saw type | Adjustable hole saw, circle cutter, step cutter, cone cutter, tapered reamer |
| Hole saw brand | Bosch, Lenox, Starrett, Aldi, Disston, Milwaukee, Freud, Klein Tools, IRWIN, DEWALT, VEVOR |
| Hole saw size | 3/4 inch, 20mm, 28mm, 2â…› inch, 38mm, 45mm, 60mm, 165mm, 300mm, 1ft |
| Cutting technique | Clamp, tape, drill small pilot holes, use scrap lumber for support, sand the inside of the hole, use a die grinder |
| Considerations | Hole saw teeth can grab soft plastic, twisting core plugs, kickback, friction, melting plastic, long side-handles, two operators for large holes |
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What You'll Learn
Hole saws are suitable for cutting plastic
For larger holes in plastic, a hole bit is the best option. It is important to choose the right size saw for the job, as using a bit that is too small can increase the risk of overheating, and using one that is too large can damage the material. Hole saws are typically suitable for plastic that is at least 2mm in thickness. For thinner plastics, it is recommended to use a stepped cutter or a cone cutter, as hole saws may cause cracking.
Some specific hole saw brands that are suitable for cutting plastic include Bosch Progressor, Starrett, and Makita. The Bosch Progressor hole saws are attractive because they fit the arbor easily, although they can be hard to control when drilling into soft plastic. The Starrett holesaws are highly recommended by many users, although they are more expensive than other options. The Makita holesaws are also mentioned as a good option, especially for those on a budget.
Overall, hole saws can be suitable for cutting plastic, but it is important to consider the thickness and type of plastic, as well as using the correct techniques and choosing the right size of the saw to avoid damaging the material.
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Standard hole saw diameters are best
Hole saws are a great option for cutting holes in plastic, especially when the desired hole size is a standard hole saw diameter. Standard hole saw diameters are best as they are widely available and can be used to cut holes in a variety of materials, not just plastic.
Hole saws come in a range of standard diameters, from 3/4-inch to 6-inches, and even larger. This variety ensures that you can find the right size for your specific needs. For example, if you're cutting a hole for conduit, a 3/4-inch hole saw would be suitable, while a larger 6-inch hole saw might be needed for can lights.
The Lenox Tools model, with its 2â…›-inch diameter, is a popular choice for those looking to cut holes for door locks or knobs. It comes with an arbor, allowing you to get started right away, and its speed slot design makes removing plugs quick and efficient. The Milwaukee kit, on the other hand, offers an impressive 28 individual saw sizes, providing versatility for various projects.
When using a hole saw to cut plastic, it's important to go slow and steady to avoid melting or cracking the plastic. Using a drill with reversible settings can be advantageous as running the drill in reverse can help prevent melting. Additionally, clamping and taping the plastic before cutting and starting with small drill bits for the pilot hole are recommended practices.
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Reverse the drill for thin plastic
Drilling holes in thin plastic requires some extra care to avoid cracking or damaging the material. Here are some tips for reversing the drill when working with thin plastic:
First, it is important to use the correct drill bits. Spur-point or dowel bits are recommended for drilling holes in plastic. These bits have a specific angle that minimises stress on the material and creates a smooth cut. Avoid using twist bits, as they can splinter and ruin the plastic.
When drilling thin plastic, it is crucial to work slowly and carefully. Set your drill speed to a maximum of 200 RPM and consider drilling for a few seconds, then stopping to let the plastic cool down. Always support the plastic with scrap lumber or another solid surface to prevent cracking. It is also recommended to clamp down the plastic securely and use tape to protect the surface from scratches.
Before drilling, start with small drill bits for the pilot hole and gradually increase the size until you reach the desired diameter. This ensures that the hole is accurately positioned. Additionally, consider using a lubricant when drilling deeper holes to help remove debris and reduce heat buildup.
While it is not necessary, running the hole saw in reverse can be beneficial when drilling thin plastic. This technique helps to cut a clean hole and prevents the plastic from melting. However, even when drilling in reverse, it is important not to apply too much pressure to avoid damaging the material.
Finally, after drilling, you may need to sand the inside of the hole to smooth out any rough edges. This step ensures a clean and neat finish.
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Use a cone cutter for non-standard hole sizes
Hole saws are suitable for cutting holes in plastic when the required hole size is a standard hole saw diameter. However, when the desired hole diameter is not a standard hole saw size, alternative tools, such as a powered cone cutter or a hand tapered reamer, become invaluable.
Cone cutters are particularly useful for drilling variable-sized holes or expanding pre-cut holes in plastic. They are designed to create holes in a range of sizes and can be used to make existing holes bigger. For example, a cone cutter can be used to enlarge a hole from 16mm to 20mm.
When using a cone cutter to cut holes in plastic, it is important to select a suitable cutter material. High-grade steel cone cutters are ideal for use on plastics and non-ferrous metals. Additionally, it is crucial to work slowly and steadily to achieve accurate results. Drilling at a low speed, such as 200 rpm, can help prevent cracking of the plastic. Clamping the plastic and using tape to secure the area to be cut can also improve accuracy and prevent damage.
Cone cutters are available in various sizes and configurations to suit different needs. For example, a 5-piece HSS high-speed steel step drill bit set offers 50 different cone drill bit sizes, providing versatility for cutting holes in wood, stainless steel, and sheet metal. On the other hand, a 4-piece step spiral groove conical cone drill bit set offers a more affordable option for drilling holes in the range of 4mm to 12mm.
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Hole saws are more efficient than drill bits
Drill bits, on the other hand, are perfect for quickly drilling into wood and softer materials and making rough holes. They are also great for projects where multiple holes need to be drilled quickly. However, they leave rough edges and are not suitable for wider hole drilling.
Hole saws are made up of two parts: a saw blade and a mandrel. The saw blade is attached to the mandrel in a circular shape. The holes made by the hole saw bit are called complete holes and are much cleaner and smoother than other drill bit holes. The teeth of the hole saw are usually made of HSS or carbide, making them efficient and long-lasting.
When using a hole saw to cut plastic, it is important to go slow and steady. The plastic should be clamped down and taped to prevent cracking and surface scratches. For thin plastic, it is recommended to use scrap lumber for support. Additionally, running the hole saw in reverse can help prevent the plastic from melting.
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Frequently asked questions
Hole saws can be used to make holes of various sizes. Common hole saw depths are 38, 45 and 60 mm, and they can also come in sizes of 165 and 300 mm for drilling through rooftop constructions. Hole saws come in a wide range of diameters, from 3/4-inch to six-inch holes.
Hole saws are suitable for cutting holes in plastic, but the specific type of hole saw depends on the thickness of the plastic. For thin plastic, a standard hole saw should work, but for thicker plastic, a diamond hole saw or a cone cutter may be needed.
When using a hole saw to cut plastic, it is important to go slow and use a low speed, especially for drilling fan mount holes. It is also recommended to clamp the plastic, use tape to protect the surface, and support the plastic with scrap lumber to prevent cracking. For thicker plastic, it may be necessary to drill a pilot hole and work your way up to the desired size.
