One of the most important tools in any workshop is a good saw blade. A sharp saw blade makes quick work of any project, while a dull blade can really slow you down. In this article, we’ll show you how to sharpen a saw blade using a simple grinder.
Determine The Type Of Saw Blade You Need To Sharpen:
hand saw blade, hacksaw blade, circular saw blade, miter saw blade or band saw blade?
A hand saw is typically used to cut wood and other materials that are not extremely hard. The teeth on a hand saw can be found in many different styles: crosscut, ripsaw, rip-tooth, crosscut-tooth and so on. Look at the type of blade you have and determine the tooth style,as it will affect your sharpening technique.
The teeth found on a hack saw blade are typically designed to cut metal easily. The size of the teeth can vary greatly, depending on how coarse or fine you need the cut to be. Some blades also have small notches between each tooth (called gullets).
Circular Saw Blade:
Typically used to cut through lumber and other materials, circular saw blades have straight, evenly spaced teeth.
Miter Saw Blade:
A miter saw blade is designed to make precise crosscuts at different angles. The teeth on a miter saw blade are usually set at an angle of around 15 degrees.
Band Saw Blade:
A band saw blade is used to cut through a variety of materials, such as wood, metal and plastic. The teeth on a band saw blade are typically curved and set at an angle.
Once you have determined the type of saw blade you need to sharpen, you can move on to the next step.
Select The Grinder:
Selecting the right grinder is also important. Look for a grinder that has a variable speed control and can run between 1400 rpm to 3000 rpm, as this will allow you to use the correct cutting speed for each type of saw blade. You’ll also need a flexible work light along with eye protection to help see the sharpening area.
A bench grinder is often used to sharpen saw blades, but you can also accomplish the same task using a belt sander. Belt sanders are more difficult to control than bench grinders and require an experienced hand to avoid scratching or damaging blade edges.
Gather Materials and Tools:
- Saw blade
- Angle grinder (or bench grinder) with fine grinding wheel
- File or sharpening stone
- Water or lubricating oil
STEP 1: Remove any bolts that may be locking the saw blade onto the machine.
STEP 2: Set the angle grinder to spin at about 400 rpm and turn it on. Make sure to use proper safety gear.
STEP 3: Using the water or oil, wet the grinding wheel and then set it against one side of the saw blade. Curl both ends of the blade into an upside-down “U” shape so there’s about 1/2 inch hanging off each side. Then move it back and forth across the grinder so you’re grinding off all the old metal.
STEP 4: Once one side of the blade is completely flat, flip it over and grind off the other side. If you’ve got a really dull blade, you may have to do this a few times on each side.
STEP 5: Flip the saw blade over and grind down both edges so they’re nice and sharp.
STEP 6: Finally, use the file or sharpening stone to smooth out any rough edges.
Other Methods Of Sharpening A Saw Blade:
There are a few different methods that can be used to sharpen a saw blade:
1) Hand-grinding: This is the most common way. This method involves using an angle grinder and taking off small amounts of metal at a time. You will need plenty of eye protection and wear sturdy clothing to prevent debris from flying into your eyes or skin.
2) Belt-grinding: This method is often used on bench grinders. The belt-grinder moves a sanding belt across the blade, removing small amounts of metal in the process.
3) Sharpening stones: This traditional method uses a sharpening stone to remove small amounts of metal from the blade.
4) Diamond stones: A diamond stone is a sharpening tool that uses small diamonds to remove metal from the blade.
5) Electrical discharge machining (EDM):This method uses electrical sparks to remove small amounts of metal from the blade. It is a more expensive option, but it does a great job of sharpening the blade.
Use An Angle Grinder With A Cut-Off Wheel:
If you don’t have a bench grinder, you can also use an angle grinder with a cut-off wheel to sharpen your saw blade. The process is very similar, but you’ll need to be extra careful not to damage the blade edges.
Once you have successfully sharpened your saw blade, it’s important to keep it sharpened on a regular basis. This will ensure that your cuts are precise and accurate, and will help extend the life of your blade.
- Make sure to wear proper safety gear when using power tools.
- Never point the angle grinder at yourself or anyone else.
- Be careful not to grind off too much metal, especially near the edges of the blade. You don’t want to make it too thin and weaken it.
- If the saw blade starts getting too hot, stop using the angle grinder and let it cool down.
Benefits Of Sharpening A Saw Blade:
- Eliminates the risk of injury to yourself and others.
- Increases blade lifespan.
- Creates smooth, accurate cuts for your projects.
- Allows you to focus more on the project, rather than constantly having to replace dull tools.
- Time consuming.
- Requires specific tools and expertise.
- Wastes resources.
- Space required for equipment storage/usage.
When To Replace Your Saw Blade Instead Of Sharpening It?
If the scratches left by the sharpening grinder are too deep, they can cause rough cuts that will need to be sanded down. If this is the case, then it may be time to replace your saw blade.
So to answer the question, “How to sharpen a saw blade?” You need to first determine what type of saw blade you have. If it’s an angle grinder, an angle grinder with a cut-off wheel will help get the job done even faster. Then, once you have your sharpening tools ready to go.
So, whether you’re a beginner or an experienced woodworker, it’s important to know how to sharpen a saw blade. By following these simple steps, you can keep your blades in top condition and achieve accurate, smooth cuts every time.