A keyhole saw is a specialized tool built for one specific job: making small, clean holes in wood or drywall. You will often see it called a compass saw. It features a small, pointed blade attached to a wood or plastic handle. This setup makes it ideal for cutting openings in softer materials, such as drilling a hole in a wall for a new electric switch.
Keyhole Saw Specifications: Blade Length and Teeth
Most keyhole saws feature a single handle that accepts various interchangeable blades. These blades differ in width, length, and tooth count. Blade lengths typically range from 5 to 15 inches. The tooth density varies between 5 and 20 teeth per inch, with 8 to 10 teeth per inch being the most common standard.
Choosing the right blade matters. If you are cutting drywall, use a shorter blade. Why? Because a long blade can punch through the opposite side of the wall, damaging insulation or wiring behind the drywall.
How to Safely Use a Keyhole Saw: Step-by-Step
- Select and Attach the Blade : Pick the appropriate blade for your material and ensure it is firmly attached to the handle. A loose blade is dangerous and ineffective.
- Mark Your Cut : Use a pencil to mark the exact location of the hole.
- Start the Hole : Depending on the material, you may need to drill a starter hole. This allows the pointed tip of the keyhole saw to insert easily.
- Cut Carefully : Move the saw forward and back along the marked line. Do not apply excess pressure. If you push too hard, the blade can jam in the cut, making it difficult to continue or remove.
- Check Safety : Always ensure your keyhole saw blades are sharp and handles are securely fastened before starting.
Keyhole Saw Maintenance: Sharpening vs. Replacement
Most keyhole saws are relatively inexpensive to purchase. Because of this, professional sharpening is often more costly than simply buying a new blade or even a new saw. If your blade is dull, consider replacement over repair.
Other Tools for Similar Cuts
While the keyhole saw excels at small holes, other handsaws serve different purposes:
– Crosscut saw : General wood cutting across the grain.
– Ripsaw : Cutting wood along the grain.
– Backsaw : Fine joinery work.
– Coping saw : Cutting curves and intricate shapes.
– Hacksaw : Cutting metal and plastic pipes.
You can also find electric-powered versions, such as reciprocating saws, which offer speed for larger or tougher jobs. However, for precise, small holes in drywall, the manual keyhole saw remains a practical choice.
