A circular saw is only as good as its blade. No matter how much power or smart options your machine has, if the blade is dull, dirty, or damaged, every job becomes a struggle, and you’ll never get a clean sawing result. Here, you’ll find professional advice on how to keep your circular saw blade in top condition.
Cleaning the saw blade
The frictional heat that occurs during sawing causes the resin in the wood to liquefy and stick to the saw blade with the sawdust. This forms a tough layer, with possible consequences being ragged saw cuts and burn marks on the wood. The blade will also wear out faster because it is under heavier strain. Especially when sawing pine and spruce wood, it is important to remove the encrusted resin from the blade regularly. There are special resin solvents mainly used for hedge trimmers and chainsaws, but oven spray, petroleum, paint thinner, or brake cleaner also do the job. WD40 is suitable for removing rust.
Sharpening the saw blade
Over time, even the hardest saw teeth become dull. You’ll notice this in the performance. Sawing becomes slower, and a dull saw produces more splinters. Before a saw blade needs to be replaced, it can be sharpened several times. You can have this done by a professional or try it yourself with a suitable file. For this, remove the saw blade and clamp it in a vice to prevent the teeth from bending during sharpening.
Replacing the saw blade
When you use a circular saw quite often, the teeth wear down to a point where there’s nothing left to sharpen, and you’ll need a new blade. This is the moment to consider the different options. The shape, number, material, and angle of the teeth determine which materials a circular saw blade is suitable for. Do you want the same blade or one with finer or coarser teeth? Is a standard blade enough, or would you prefer an ultra-hard blade that retains its sharpness longer even when cutting materials like composite or trespa? Whichever new blade you purchase, it’s important that it’s specifically intended for your machine and has the correct diameter, thickness, and arbor hole. Blades for a handheld circular saw are not interchangeable with those for a miter or table saw and vice versa.
Safely working with a circular saw
- Always operate the saw with both hands to prevent injury in the event of an unexpected kickback.
- Support the material you’re sawing as close to the cut as possible and secure the workpiece with clamps.
- Set the saw depth correctly. A small part of the teeth should protrude below the workpiece.
- Always use a width guide or rip fence when ripping.
- Don’t stand directly behind, but slightly to the side of the saw blade behind the machine.
- If the saw blade jams or when you interrupt sawing, keep the machine in the material until the blade stops. Removing the machine from the material while the blade is still spinning can cause kickback.
- Never force the circular saw, but push it forward at a speed where the blade does not slow down.
- Protect yourself during sawing with safety glasses, a dust mask, and hearing protection.