How to change a circular saw blade


Photo: istockphoto.com

A staple in workshops and on construction sites, circular saws are one of the most popular portable power tools, prized for their ability to make fast, straight cuts. Different types of circular saw blades are available for cutting various materials including plywood, hardwood, metal, and plastic. Like anything with moving parts, a circular saw blade will eventually dull with repeated use.

For the cleanest cuts, when a blade becomes dull, it is replaced with a new blade. Fortunately, learning how to install a circular saw blade is one of the easiest tool maintenance tasks.

Keep reading – we’ll show you how to remove a circular saw blade and how to replace a circular saw blade.

Tools and materials

There is a short list of tools and supplies needed to change a circular saw blade. You will need the saw. While blades on all circular saws are replaced the same way, we show how to install a blade on a circular saw with the DeWalt 7-¼” Circular Saw.

BEFORE YOU START

No special skills or requirements are needed to change the blade of a circular saw, but it helps to be familiar with how the saw works.

In addition, the blade tips of old and new saw blades are sharp. Handle them with care. Wearing a pair of soft leather gloves, although not required, will protect the hands while allowing the user to have enough dexterity to easily change the blade.

STEP 1: Unplug the circular saw from its power source.

how to change a circular saw blade

Photo: Glenda Taylor

Safety first. Savvy DIYers know that it’s not safe to service a power tool while it’s plugged in. Unplug a corded or pneumatic circular saw from the outlet or hose and remove the battery from a cordless circular saw. The goal is to disconnect the power source.

how to change a circular saw blade

Photo: Glenda Taylor

Circular saws come with special wrenches designed to service the tool. This key is usually stored in a slot on the saw body and can be removed by simply pulling it out.

If the key has fallen or been lost, it is a good idea to purchase a replacement circular saw key. Alternatively, other types of spanners are likely to fit the circular saw bolt, but if the fit is not perfect the tool could slip and damage the bolt.

STEP 3: Press the spindle lock button to prevent the saw blade from spinning.

how to change a circular saw blade

Photo: Glenda Taylor

Every circular saw is equipped with a spindle lock, a knob located on the saw body that prevents the blade from spinning when the knob is engaged. If the spindle lock button is not pressed, the blade and bolt will spin when the user tries to remove the bolt holding the old blade in place, making it impossible to loosen the bolt. The only reason for the spindle lock button is to lock the blade in place so that the bolt can be removed or replaced. Press and hold it.

STEP 4: Use the circular saw wrench to loosen the bolt holding the blade in place.

how to change a circular saw blade

Photo: Glenda Taylor

While holding down the spindle lock button, use the circular saw wrench to loosen and remove the bolt that holds the saw blade in place. Turn the key counterclockwise to remove the bolt and set it aside.

In most cases, the bolt is simple to remove with the wrench. However, wood sap residue or even corrosion can cause a bolt to stick. If the bolt sticks, spray it with a little lubricating oil, like WD-40, then try again.

STEP 5: Push the blade guard to remove the old blade.

how to change a circular saw blade

Photo: Glenda Taylor

The blade guard of a circular saw is the protective housing that pivots when the user begins to cut with the saw. The blade guard pivots on the blade when the saw is not in use. The guard easily slides back and forth.

Now is the time to remove the old blade, which is now loose. Simply push the blade guard with your hand and remove the old saw blade from the saw.

STEP 6: Slide the new blade into place and replace the bolt.

how to change a circular saw blade

Photo: Glenda Taylor

Installing the new blade is as easy as removing the old one, just reverse the steps. Slide the blade guard out of the way, place the new blade on the saw, with the marking facing outward and with the center hole aligned with the hole in the spool. Replace the bolt and tighten it with the saw wrench. Again, hold down the spindle lock button to tighten the bolt firmly without the blade spinning.

Pro tip: When learning how to put a blade on a circular saw, keep in mind that circular saw blades cut from the bottom up. The saw blade is labeled as to which direction the tips should point. Some professionals flip saw blades in order to make specialty cuts, but for best general use, install the blade in the direction suggested by the manufacturer.

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