Sharpen the circular saw blade - you can do it yourself?

In most cases, saw blades will be replaced rather than actually sharpened or even set. In principle, however, it doesn't hurt to know how to do it. Circular saw blades do not necessarily have to be thrown away when they have become blunt - this also saves costs and lengthy spare parts orders. Instructions can be found in this post.

Sharpenable sheets

Saw blades can always be sharpened by hand if they are not equipped with specially hardened teeth. Such hardened saw blades are usually just as hard as the files with which you want to sharpen them - this will then not produce any result.

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With special files (diamond files), such saw blades can still be sharpened by hand, but this is usually not very useful. Here it is better to use special sharpening devices.

Sharpening device for circular saw blades

Specialized grinding devices for circular saw blades are available from specialist retailers. They usually cost between 120 and 250 EUR, but individual devices can also be more expensive or cheaper. These grinding devices work electrically and, as optional accessories, also have special grinding wheels for hardened saw blades.

The teeth of the saw blade can be made very sharp again, as a rule, this can be repeated several times. Occasionally setting or dressing is necessary. A saw blade only needs to be replaced if it is actually damaged.

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Problems can arise when saw blades have a larger diameter than the grinding machines can handle. In most cases this only affects very large leaves. Most circular saw blades fit into the machines designed for them.

Dressing saw blades

Dressing is necessary because the shape of the teeth is slightly changed after several grinding processes. Individual teeth are then shorter than others and would then no longer produce any cutting performance between the other, protruding teeth.

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During dressing, the teeth are therefore brought back to approximately the same length so that all teeth cut again. You can do that yourself. Individual machines can also do the dressing.

Cabinets for saw blades

In addition to dressing, which is required more often, setting is also sometimes necessary.

When setting the teeth, the teeth are bent alternately on both sides, so that later the saw cut is wider than the saw blade itself, which later prevents the saw blade from jamming when sawing.

Setting pliers and setting apparatus

Traditionally, so-called setting pliers are used for setting. The problem here is that the set only becomes even with a lot of practice. Setting devices for circular saw blades, as can be bought in specialist shops, are better suited for this.

A professional setting device ensures that the teeth of the circular saw pliers are bent evenly, thus ensuring that the sheet is set evenly. As a rule, these devices are available from around 80 EUR in the appropriate specialist trade.

As with the sharpening machines for circular saw blades, there can also be problems here with very large blade diameters. In individual cases, very large sheets of paper can no longer fit into the device.

Have circular saw blades sharpened professionally

You can save yourself the effort and expense if you have circular saw blades professionally sharpened, dressed and set - but the purchase of equipment pays off if you have to sharpen the blades more often and the circular saw is used frequently.

Even those who saw their own firewood, for example with a circular saw, will have to sharpen it more often. In these cases, buying your own sharpening equipment is definitely worthwhile. Even there, where wood is sawn with lots of nails (e. B. Pallet wood) it may be necessary to sharpen the saw blade frequently.

Sharpening and dressing unhardened circular saw blades by hand - instructions

  • Circular saw blade
  • Screw clamp
  • suitable flat file
  • necessary tool for dismantling the saw blade (depending on the respective circular saw model)

1. Dismantle the saw blade

It is essential to wear cut-resistant gloves to avoid injuring yourself. Before doing this, make sure that the machine has been switched off and disconnected from the mains. With most circular saws, you can loosen the saw blade to the appropriate size with a simple ring spanner.

2. Clamp the saw blade

Attach the screw clamps (€ 6.25 at Amazon *) to a table and clamp the saw blade in such a way that only a few teeth protrude from the screw clamp. This makes work easier and also prevents the saw blade from "flapping" during dressing and sharpening.

3. Dressing

First, make sure that all teeth are the same length. You can do this easily by running the file over the tips of your teeth. A small area is formed there by the dressing, which you then remove by reshaping the teeth from the tooth side. To do this, you usually only need a few strokes of the file. Work very carefully here - the subsequent cutting performance largely depends on this.

4th. Sharpen teeth

Work with just a few strokes of the file and try to remove as little material as possible. Work your way up tooth by tooth and sharpen the cut surfaces again with a few strokes of the file. Since saw teeth often have alternating cutting surfaces, you must first machine every second tooth and then clamp the saw blade upside down to sharpen the remaining teeth.

5. Mount the saw blade

Be very careful when reassembling, wear gloves again and tighten the fastening very firmly. A loose attachment can be life-threatening!

Tips & Tricks By grinding, you can use a good circular saw blade many times. You don't necessarily have to throw it away when it becomes dull. As a rule, it is clearly worth it.