Umair Gaines
Cutting a metal door frame to install an electric strike can be a challenging task. While some electric strikes require cutting out a portion of the doorjamb, there are also No-Cut electric strikes available that do not need any modification to the doorjamb. The type of strike to be used depends on the door's condition, frame configuration, and power requirements. The tools required for the installation vary, with some people recommending a Dremel tool with fiber cut-off wheels, while others suggest using a jigsaw or a power file for more precision.
Characteristics and Values Table for Cutting Metal Doors for Electric Strikes
| Characteristics | Values |
|---|---|
| Tools | Dremel, jigsaw, metal shears, grinder, die grinder, angle grinder, cut-off tool, powerfile, hammer and chisel, router, oscillating tool, mini hacksaw |
| Door Materials | Metal, wood, aluminium, steel |
| Challenges | Wiring the lock, door frames not in good condition, fire-rated doors, high security applications |
| Considerations | Size of strike, strength, function, power requirements, appearance, door swing, door jamb configuration |
| Products | HES 5000 series, Securitrons UnLatch motorized strike series, electrified locksets |
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What You'll Learn
Selecting the right tools for the job
First, assess the type of metal your door is made of. Steel and aluminium doors, for instance, may require different cutting tools compared to other metals. Steel doors, in particular, are considered one of the most challenging installations due to the inherent strength of the metal.
For cutting metal door frames, a good option to consider is a jigsaw with a metal-cutting blade. Look for a jigsaw that offers slow variable speed function, as this provides control and precision when making the necessary cuts. Additionally, a metal shear, either manual or electric, can be effective for cutting through metal doors.
If you're comfortable using power tools, an angle grinder can be a preferred method for cutting metal. It's worth noting that grinders may not offer the same level of precision as a jigsaw, but they can be more versatile and powerful.
For smaller cuts and detailed work, a Dremel tool is a popular choice. The corded models offer consistent power, but cordless options are also available for added flexibility. Dremel tools are excellent for precision cutting, grinding, and drilling. However, they may not be suitable for thick metal doors, as they can be time-consuming and hard on the cutting wheels.
When working with metal doors, it's essential to consider the scale of your project and the number of doors you need to modify. For example, if you have many doors to cut, investing in more efficient tools or hiring a professional may be more cost-effective and practical.
Finally, remember that electric strikes have specific requirements. Consider the strike's size, strength, function, and power requirements before starting. Additionally, be mindful that fire-rated doors have specific regulations and limitations on modifications, so be sure to consult relevant guidelines before making any cuts.
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Using a Dremel to cut metal
When using a Dremel to cut metal, it is important to first mark the cut line with a small square or template. For cutting metal, the Dremel is fitted with a fibre cut-off wheel, which can be used to cut the metal along the marked line. It is important to note that the Dremel carbide cut-off wheels, while effective, are prone to shattering, so eye protection is crucial when using this type of wheel. The Dremel EZ lock version is an improved product that addresses this issue.
For cutting a metal door frame for an electric strike, the Dremel can be used for the vertical cut, especially if there is a stud behind the frame. For the horizontal cut, a thin jig saw with a metal blade can be used. If the blade is too long, it can be shortened. The Dremel is useful for cutting out the metal mortar box, which may be necessary even when using no-cut ASA strikes.
The corded Dremel models are preferred over the cordless versions, as they offer more power and speed. The vari-speed Dremel is a good option as it allows for precise cutting, grinding, and drilling.
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Using a jigsaw for cutting metal
To begin, it is important to select the appropriate blade for the jigsaw. A thin metal blade is ideal for cutting metal, and if the blade is too long, it can be shortened to fit the jigsaw. Mark the cutting lines on the metal door frame with a small square or template before starting. This will ensure straight and accurate cuts.
For the horizontal cuts, use the jigsaw with the metal blade attached. Adjust the speed of the jigsaw to a slow, variable speed to ensure control and precision during the cut. Move the jigsaw slowly and steadily along the marked line to create a clean cut.
For the vertical cuts, assess if there is a stud behind the cutting area. If there is a stud, use a Dremel or a similar rotary tool to cut the metal. If there is no stud, the jigsaw can be used to complete the vertical cuts as well. Remember to take appropriate safety precautions, such as wearing eye protection, when operating power tools.
Additionally, if you are removing the back box of the electric strike, you may need to use a combination of tools. Drill holes in the corners of the box and use an oscillating tool to cut between the holes. This will help detach the back box from the door frame effectively.
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Drilling the door for the wire
First, you need to select the appropriate tools for the job. A Dremel tool with a fibre cut-off wheel is a popular choice for cutting metal door frames. Alternatively, you can use a jigsaw with a metal blade, a die grinder, or an angle grinder. For wood door frames, you can use a sharp chisel and a drill with a hole saw or paddle bit.
Before you begin drilling, it is essential to plan the wiring route carefully. Determine the location of the power source and the path the wires will take through the door and frame. Mark the drilling points on the door and frame with a small square or a template.
Now, you can start drilling. If you are drilling through metal, stitch drill the outline of the hole you need to create. For wood, use a sharp chisel to cut the edges, then use a drill with a suitable bit to create the necessary holes. Remember to wear eye protection when drilling to catch any metal shards that may fly off.
After drilling the holes, you will need to run the wires through the door and frame to the power source. The recommended wire gauge will depend on the distance and voltage requirements of your electric strike lock. Consult the owner's manual for specific instructions. Ensure you use the correct wire type and size to avoid issues with the controller hardware or the strike not functioning properly.
Finally, connect the wires to the electric strike lock, following the instructions in the user manual. Test the lock by opening and closing the door to ensure it works correctly. You should also test the lock in various scenarios, such as trying to force it open, to ensure its reliability.
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The challenges of installing electric strikes into existing frames
Installing electric strikes into existing door frames can present several challenges. Firstly, the condition of the door and frame is crucial. Unless they are in reasonably good condition and working properly, the electric locking solution may not function correctly, even if it is installed well. This is particularly important for electromagnetic locks, which have gained a reputation for malfunctioning.
Another challenge is ensuring the electric strike fits the frame. Even under favourable conditions, installing an electric strike is rarely straightforward, and adjustments are often required. The installer must have the right tools and skills to cut, mortise, file and drill the frame to fit the locking device.
The power requirements of the electric strike are also important to consider. The system must have the correct AC or DC voltage and current rating to match the power supply. Getting the necessary wires to the lock to power it can be a challenge, especially for aluminium and metal frames.
Furthermore, the type of strike must be carefully chosen. Strikes can be fail-safe or fail-secure, and the choice will depend on the specific needs of the building. A fail-secure strike will remain locked during a power outage, keeping the building secure. On the other hand, a fail-safe strike will unlock during a power loss, allowing free access.
Finally, the strike must comply with relevant safety codes and regulations. For example, fire-rated doors must meet specific standards, and stairwell doors must be unlocked and positively latched during a fire alarm or power outage.
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Frequently asked questions
You can use a Dremel with fibre cut-off wheels, a thin jigsaw blade, a grinder, or a powerfile.
A No-Cut electric strike does not require any cutting of the doorjamb. However, these are not suitable for high-security applications.
The best tool depends on the specific application. For example, a Dremel is good for tight corners, but a jigsaw is generally not usable on door frames.
You can use a Dremel with carbide cut-off wheels, but be aware that the old carbide disks were prone to shattering.
First, mark the cut with a small square or template. Then, cut the horizontal line with a thin jigsaw blade. If there is a stud behind the vertical line, use a Dremel; if not, complete the cut with the jigsaw.
