Braking the circular saw - how does it work?

In this article you can read how a brake works on the table saw, what it is used for and which safety-relevant features must be met. About how brakes can be retrofitted and what to look out for.

Need for the brakes on the circular saw

The circular saw blade is set in rotation by the drive. If you switch off the drive, the saw blade does not stop immediately. It still runs for a certain time. You have probably already observed this effect with a circular saw.

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However, since a saw blade that continues to run is always a safety risk, this run-on time must be limited so that injuries do not occur. However, this is not always the case with all saws - especially not with older and very old models.

Safety-relevant requirements

The brakes for the saw blade should definitely limit the follow-up time to less than 10 seconds. This time is measured after the saw has been switched off. Longer follow-up times represent a security risk.

When executing the brakes, it should be ensured that they actually only become effective after switching off (this is also not the case with all saws). In addition, they must not act on the saw blade through friction, but should act on the motor shaft.

In no case are brakes made of a spring steel sheet on which a felt is applied that brakes the saw blade. These brakes can start to slip through dirt or oil films, which can no longer be compensated for by the adjustment options (contact pressure). In addition, the brake may no longer be safe after changing the saw blade.

Retrofitting of brakes

In principle, retrofitting brakes by electrical means is conceivable, but very complex. As a rule, it is more worthwhile to buy a new saw if the follow-up time is too long and not limited.

Other important safety measures

If you use a circular saw, be sure to purchase a modern model with a fixed riving knife and cover as well as a fixed table (not horizontally adjustable) and familiarize yourself with the necessary protective measures when sawing.

Tips & Tricks When you cut a saw, especially for firewood or commute waste wood, consider whether a rocker saw does not make sense anymore. The security risks are significantly smaller, the cutting performance is often significantly higher.