Omar Khalid
Drilling threads into plastic requires a certain level of skill and know-how. The process involves first drilling a hole in the plastic and then creating threads on the inner sides of the hole using a device called a tap. Taps are metal cylinders with threads at one end that are inserted into the drilled hole and twisted. It is important to use the correct size tap for the hole, ensuring that the diameter of the tap matches that of the hole. The process can be done by hand with a standard tap wrench or a hand drill, but for larger sizes, a tap wrench is recommended due to the increased torque required. When tapping holes in plastic, it is important to consider the material's fragility and the potential for shrinkage during cooling, which can affect the strength and size of the threads. Additionally, alternative methods such as using brass threaded inserts or epoxy can be explored to create threads in plastic.
| Characteristics | Values |
|---|---|
| Order of Actions | First, drill a hole in the plastic, then create threads on the inner sides of the hole |
| Tool | A device called a tap, which is a metal cylinder with threads at one end |
| Tap Size | The tap should be the same diameter as the hole |
| Drill Bit | Use a metal drill bit |
| Tap Position | Place the end of the tap into the drilled hole, making sure it is 90 degrees to the surface of the plastic |
| Tap Movement | Turn the tap handle slowly clockwise 1/4 turn, then turn it counterclockwise to remove plastic shavings |
| Limitations | Threads in plastic are fragile and cannot be considered load-bearing |
| Alternative Methods | Using a tap wrench, a bottoming tap, epoxy, or hot glue |
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What You'll Learn
Drilling the hole
Drilling a hole into plastic is a careful process that requires the right tools and a steady hand. The first step is to ensure you have the correct drill bit for the job. For drilling into plastic, a metal drill bit is required. It is also important to select the right size of the drill bit for the hole you wish to create. Drill bits come in various sizes, so choose one that matches the diameter of the hole you need.
Once you have the correct drill bit, you can begin the process of drilling. Secure the plastic in place so that it does not move during the drilling. Hold the drill straight and steady, and apply gentle pressure as you start to create the hole. It is important to go slowly and carefully to avoid any slipping or mistakes. Drill to the correct depth, being mindful not to go too deep.
If you are drilling a hole larger than 1/4", you may need to use a tap wrench due to the amount of torque required. For smaller holes, a hand drill or a standard tap wrench can be used. When using a tap wrench or hand drill, be sure to use a coolant to prevent the plastic from melting due to friction and heat. Distilled water is a good option as it does not leave any residue.
It is important to note that drilled holes in plastic can shrink as the plastic cools, so you may need to compensate for this when choosing your drill bit size. Additionally, if you are using a 3D-printed plastic part, consider the thickness of your shells; if they are thicker than the depth of your threads, the holes will be stronger.
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Creating threads
First, drill a hole in the plastic. The hole should be the correct size for the tap that will be used to cut the threads. For plastic, holes smaller than 4mm are best drilled undersized and the screw itself can be used to cut the threads. For holes larger than 4mm, a metal drill bit should be used. The hole should be drilled to the right depth.
Next, create threads on the inner sides of the hole using a tap. A tap is a metal cylinder with threads at one end that is inserted into the drilled hole and twisted. Ensure that the diameter of the tap matches the diameter of the hole. For example, if you drill a 1/2-inch hole, use a 1/2-inch tap. Place the end of the tap into the hole, making sure it is at a 90-degree angle to the surface of the plastic. Turn the tap handle slowly clockwise by 1/4 turn, and then turn it counterclockwise to remove plastic shavings.
When tapping holes in plastic, it is important to use a coolant to prevent the tap from overheating and melting the plastic. Distilled water can be used as a coolant and is a good option as it leaves no residue after being blown clean with compressed air. For sizes larger than 1/4", a tap wrench is recommended as they can deliver more torque, while for sizes smaller than 1/4", a bottoming tap is recommended as it makes a cleaner cut and produces less friction and heat.
There are also alternative methods to create threads in plastic without using a tap. One method involves using epoxy and a fastener coated with a mold release agent, such as hairspray or epoxy. Another method is to use brass threaded inserts, which can be warmed up and pushed into the plastic, where they will cool and lock into place. Additionally, for 3D printed parts, a nut trap can be used, where a hexagonal cutout is made in the model and a nut is press-fitted into the cutout, providing a strong and load-bearing thread.
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Using a tap
Taps are used to create threads in plastic. The process begins by drilling a hole in the plastic, and then using a tap to create threads on the inner sides of the hole. Taps are metal cylinders with threads at one end that are inserted into the hole and twisted.
Taps come in various sizes, so it's important to use one that matches the diameter of the hole you've drilled. Place the tap into the hole, ensuring it is at a 90-degree angle to the surface of the plastic. Turn the tap handle slowly clockwise by a quarter turn, and then turn it counterclockwise to remove plastic shavings.
For holes larger than 1/4", a tap wrench is recommended due to the amount of torque required. Chrome-plated taps are a good option as they won't rust and have a lower friction coefficient. For holes smaller than 1/4", a bottoming tap is preferable as it creates a cleaner cut with less friction and heat.
When tapping holes in plastic, it's important to use a coolant to prevent the plastic from melting. Distilled water is a good option as it doesn't leave any residue. If you're tapping a blind hole, simply fill it with water.
If you're working with PVC, be aware that applying a flame to soften the plastic can be dangerous. Burning PVC releases hydrogen chloride, which can form hydrochloric acid when it comes into contact with moisture.
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Choosing the right tap size
When selecting a tap size, it is important to consider the size of the hole that needs to be threaded. Taps come in various sizes, and it is standard for them to be slightly smaller for plastics than for metals. This is because plastic tends to cool and shrink, especially when laid down in a circle, resulting in a smaller hole. Therefore, it is generally recommended to drill a hole that is slightly larger than the desired thread size to accommodate for this shrinkage.
For larger holes, a tap wrench is often required due to the increased torque needed. It can be challenging to keep the drill straight and provide sufficient torque to spin the tap. In such cases, chrome-plated taps are a good option as they resist rust and have a lower friction coefficient than bare high-speed steel. Additionally, a bottoming tap is recommended for plastic as it produces less friction and heat compared to plug or taper taps, reducing the risk of melting the plastic.
For smaller holes, a hand drill or a standard tap wrench can be used. When using a hand drill, it is important to use distilled water as a coolant to prevent overheating and potential damage to the plastic. Additionally, for very small holes, it is recommended to underdrill and use the screw itself to cut the threads, rather than using a tap. This ensures a secure fit without putting excessive pressure on the plastic.
It is worth noting that tapped holes in plastic are generally not considered load-bearing due to their fragility. If load-bearing capability is required, alternative methods such as creating a nut trap or increasing the number of shells can be considered. By pressing a nut into a hexagonal cutout, the bolt can be securely held in place. Alternatively, using more shells will increase the thickness of the plastic and strengthen the threads.
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Reinforcing threads
When connecting plastic threads to metal threads, it is important to consider the differences in the materials, especially in terms of expansion and contraction with changes in temperature. This can compromise the seal of the joint. To address this issue, it is recommended to use a union fitting, which has an EPDM seal that can accommodate differential expansion and prevent leaks.
For a straightforward connection, a metal-to-plastic composite union is preferred. However, when connecting a plastic thread directly to a metal thread, it is advisable to use a reinforcing ring. This reinforcing ring serves two purposes: it provides extra strength to the thread, preventing the plastic from cracking due to over-tightening, and it helps maintain the seal by accommodating differences in expansion and contraction between the metal and plastic components.
Reinforcing rings are available with either female or male threads on the metal side, and they can also be made of stainless steel or brass. If cost is a concern, threaded fittings with a reinforcing ring are available as an alternative to standard PVC threaded fittings, providing a more durable and secure connection.
To create threads in plastic, the process typically involves first drilling a hole in the plastic and then using a device called a "tap" to create threads on the inner sides of the hole. Taps are metal cylinders with threads at one end and are available in various sizes to match the drilled hole's diameter. When using a tap, it is important to ensure that it is inserted at a 90-degree angle to the surface of the plastic and turned slowly in a clockwise and then counterclockwise direction to form the threads and remove plastic shavings.
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Frequently asked questions
The process involves first drilling a hole in the plastic and then creating threads on the inner sides of the hole using a device called a tap.
A tap is a metal cylinder with threads at one end that is inserted into the drilled hole and twisted.
There are three types of taps: bottoming tap, plug tap, and taper tap. For plastic, a bottoming tap is recommended as it makes a cleaner cut and produces less friction and heat.
The tap should be the same diameter as the hole being drilled. For example, if you are drilling a 1/2-inch hole, use a 1/2-inch tap.
Yes, one alternative is to use epoxy to secure a threaded fastener in the hole. Another method is to use hot glue to create threads, although this is weak against heat and may not hold up as well.
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