Ethan Clarke
Drilling through plastic requires the use of a power drill and the correct drill bits to avoid chipping or cracking the material. Spur-point drill bits, also known as dowel bits, are the most effective for drilling into plastic. They are specifically angled to make smooth cuts and are equipped with a central point and spurs to maintain alignment and prevent rough edges that can lead to cracks. High-speed steel (HSS) drill bits are another popular choice for drilling into plastics, offering toughness, sharpness, and high-temperature resistance. However, lubrication is necessary to prolong their sharpness. Brad point drill bits are also suitable for plastic, producing cleaner and more precise holes with minimal plastic chips. When drilling larger holes, cobalt steel bits are recommended for their superior heat dissipation compared to pure steel bits. For the most challenging materials, such as polymer composites, carbide-tipped drill bits provide durability and can withstand heavy use without dulling or breaking. Diamond-coated drill bits, while expensive, are the most durable option for hard, abrasive plastics.
| Characteristics | Values |
|---|---|
| Drill bit type | Spur-point bits/dowel bits, step drill bits, twist drill bits, carbide-tipped drill bits, diamond-coated drill bits, brad point drill bits, high-speed steel (HSS) drill bits, cobalt steel drill bits, titanium nitride bits, black oxide drill bits |
| Drill bit material | High-speed steel (HSS), cobalt, carbide, diamond, titanium nitride, black oxide |
| Drill speed | Larger the hole, slower the speed |
| Drill speed when exiting material | Reduce speed |
| Other techniques | Clamp down plastic to a solid surface, use a lubricant, apply firm pressure, use painter's tape |
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What You'll Learn
- Spur-point bits, also known as dowel bits, are best for smooth cuts
- High-speed steel (HSS) bits are versatile and can be used on softer plastics
- Brad point bits are good for precision and reducing plastic chips
- Step drill bits are versatile and won't damage the material
- Diamond-coated bits are the most durable and ideal for hard, abrasive plastics
Spur-point bits, also known as dowel bits, are best for smooth cuts
Drilling into plastic requires the right drill bit to ensure that the holes are uniformly shaped, clean, and undamaged. Spur-point drill bits, also known as dowel bits, are specifically angled to make smooth cuts in the material. They are best suited for drilling holes in plastic.
Spur-point bits have a central point and spurs that keep the bit aligned, maintaining a clean, neat hole. The point and angle in front of these bits ensure that the stress in front is minimised and that the cut is smooth. They are an excellent drill bit for plastic because they leave a clean-sided hole and do not leave rough edges that can cause cracks. Spur-point bits, which come in sizes ranging from 3 to 10mm, can be used for drilling both plastics and wood.
When using a spur-point bit, it is important to slow down as you are exiting the material to get a clean and neat hole. Before drilling, it is also recommended to clamp down the plastic securely to a solid surface and back up the piece you are drilling with a spare piece of plywood underneath. This way, the drill bit enters the plywood when it exits the plastic, avoiding chipping the surface on the bottom.
While some sources recommend using a standard twist HSS (High-Speed Steel) drill bit for drilling plastic, others advise against it as it can splinter and ruin the material. Twist bits should be used on light metals, wood, ceramic, and masonry but not on plastic.
Other types of drill bits that can be used for drilling plastic include step drill bits, brad point drill bits, and carbide-tipped drill bits. However, spur-point bits remain the best option for achieving smooth cuts and minimising stress on the material.
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High-speed steel (HSS) bits are versatile and can be used on softer plastics
High-speed steel (HSS) bits are a versatile and popular choice for drilling into softer plastics. They are suitable for a range of materials, including wood, soft metals, and plastics. HSS bits are tough, sharp, and can withstand high temperatures, making them a good option for harder plastics, too.
HSS bits are available in various sizes, and the size you choose will depend on the type of plastic you are drilling and the size of the hole you wish to create. When drilling into plastics, it is important to note that the larger the hole, the slower the drill speed should be, as high speeds can cause the plastic to melt. Therefore, when using HSS bits on plastic, it is recommended to use a slower drill speed for larger holes and to reduce the speed as the drill bit exits the material.
To ensure a clean and neat hole, it is also important to secure the plastic before drilling. This can be done by clamping the plastic to a solid surface and backing it up with a spare piece of plywood underneath. This way, the drill bit will enter the plywood as it exits the plastic, reducing the risk of chipping or cracking the plastic.
To prolong the sharpness of HSS bits and reduce friction, it is recommended to use lubrication when drilling into plastic. Suitable lubricants include WD40, canola oil, or vegetable oil. It is also important to apply firm but gentle pressure during the drilling process and to pause and re-lubricate if the drill begins to overheat.
Overall, HSS bits are a versatile and economical option for drilling into softer plastics, but it is important to follow the correct techniques to avoid damaging the material.
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Brad point bits are good for precision and reducing plastic chips
Drilling into plastic requires the right drill bits to ensure that the holes are uniformly shaped, clean, and undamaged. Brad point drill bits are one of the best options for drilling into plastics. They are designed to drill clean, accurate holes, and their sharp center point keeps the bit positioned as it enters the material, resulting in cleaner, more precise holes.
Brad point drill bits are ideal when precision matters. Their sharp center pin ensures the bit starts exactly where you want it to, without sliding or wandering across the surface. This makes it easier to drill perfectly placed holes, especially on finished surfaces or delicate materials. The sharp central spur of the brad point bit helps to center the bit and prevents wandering during drilling. The chisel-like shoulders of the bit then slice through the material, creating a smooth hole perimeter.
The unique design of brad point bits means they won't leave a lot of plastic chips behind. They often have reduced fluting compared to twist drills, as chip evacuation is less critical when drilling into plastic. The flutes are essential for removing wood chips and are milled into the blank. Brad point bits also have fewer or shallower flutes, which can enhance hardness and improve wear resistance and reduce friction.
When drilling into plastic, it's important to remember that the larger the hole, the slower the drill speed should be, as high speeds can melt the plastic. It's also crucial to reduce the drill speed as the drill bit exits the material. Before drilling, it's recommended to clamp down the plastic securely to a solid surface and back up the piece with a spare piece of plywood underneath to avoid chipping the surface.
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Step drill bits are versatile and won't damage the material
Drilling holes in plastic can be a tricky business. The wrong drill bit can cause damage, cracking, and rough edges, which can lead to cracks even months after the drilling. The best drill bits for drilling into plastics are those that are versatile and won't damage the material.
Step drill bits are a great option for drilling into plastics. They are versatile, efficient, and won't crack or damage the material. They are cone-shaped with increasing diameters, allowing you to drill a variety of hole sizes with just one bit. The tip of the bit drills the smallest hole, and the diameter increases as you drill deeper. This makes them ideal for drilling clean, smooth-walled, and straight-sided holes in plastics and acrylics.
The risk of cracking or damaging the plastic is reduced with step drill bits as they have a straight flute, which prevents thin and flexible materials from twisting out of shape when the bit passes through. This is especially useful when drilling larger holes, as the larger the hole, the slower the drill speed should be to prevent melting the plastic. With step drill bits, you can drill larger holes without the risk of twisting or melting.
Step drill bits are also versatile in the range of materials they can drill. They are commonly used for drilling into metals such as bronze, cast iron, steel, and sheet metal. They are also suitable for softer materials like aluminium, wood, and plastic. This makes them a popular choice for trade professionals who often work with a variety of materials.
Overall, step drill bits are a versatile and reliable option for drilling into plastics. They provide smooth and clean holes without the risk of cracking or damaging the material, making them a valuable tool for any drilling project involving plastic.
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Diamond-coated bits are the most durable and ideal for hard, abrasive plastics
Diamond-coated drill bits are the most durable and ideal for drilling holes in hard, abrasive plastics. They are the most expensive type of drill bit for plastics but are extremely tough and long-lasting. The diamonds are bonded to the drill bit using nickel in a single layer, and while this won't last as long as multiple layers, it is a cheaper alternative.
Diamond-coated drill bits are perfect for drilling holes in hard plastics because they can withstand high temperatures and heavy use without dulling or breaking. They are also ideal for drilling glass, gemstones, sea glass, pearls, or ceramics. When drilling with diamond-coated bits, it's important to use them at a slow speed and with water as a lubricant.
It's worth noting that diamond drill bits are not suitable for soft plastics. Soft plastics are best drilled with a used twist drill bit, which will eliminate any burrs and keep the drill from biting into the plastic. Spur-point drill bits, also known as dowel bits, are another good option for drilling soft plastics as they are specifically angled to make smooth cuts and leave clean-sided holes.
When drilling plastic, it's important to remember to clamp down the plastic securely to a solid surface and back it up with a spare piece of plywood underneath. This will prevent the plastic from chipping or cracking. It's also a good idea to use a lubricant, such as WD40 or canola oil, to remove unwanted debris and reduce heat.
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Frequently asked questions
Spur-point drill bits, also known as dowel bits, are the most effective for drilling plastic. They have a central point and spurs that keep the bit aligned, leaving a clean, neat hole.
High-speed steel (HSS) drill bits are commonly used for drilling plastic. Brad point drill bits are another option, leaving cleaner, more precise holes. For drilling larger holes, cobalt steel bits are more efficient at dissipating heat than pure steel bits.
Before drilling, clamp the plastic securely to a solid surface and place a spare piece of plywood underneath. Apply a lubricant to the drill to remove debris and reduce heat, and pause to re-lubricate if the drill starts to overheat. Drill slowly, especially when making larger holes or using a spade bit, as high speeds can melt the plastic.
