Written on February 5, 2010 at 11:50 am by Power Tool Team

Blade Circular Saw

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Blade Circular Saw
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Circular saw Safety

I would say that aside from perhaps your drill-driver, the circular saw is one of the handyman's most frequently used tools. But as useful as this tool is, it can also be very dangerous (duh). A blade spinning fast enough to slice through wood like butter is no toy to be played with. One thing about these saws is that they have this annoying guard that keeps swingin' back over the blade every time you pull it out of the work piece. So although dangerous, many woodworkers tie the guard up so that it's permanently in the "up" position. This also means that when you place it down periodically between use the blade will make direct contact with the surface you place it on. This is not good for the blade – not to mention what would happen if someone were to accidentally trip over it and trigger the switch! -Talk about a saw that's got LEGS! (The solution for this is to park your saw upside-down or blade-up.) So as is often the case, you have to sacrifice a slice of your safety for a scoop of user-friendliness. I personally prefer to take this risk over dealing with that nagging guard. Having said that however, a friend of mine recently had an accident while using a circular saw and it was a good reminder that you can't ever let your "guard" down if you know what I mean. He was a bit shaken but ok. The 2 of us were working up on a rooftop laying roofing panels and it just so happened that my friend was scared of heights. So he had to sit and work cuz he couldn't bear to stand and be subject to one of his worst nightmares. Anyway, sitting while using a circular saw is not advised – for obvious reasons. Your arms don't have much reach which means your legs become your work bench – bad, BAD idea! He was lucky as he walked away with only a small nick near his right knee. I don't even want to imagine what COULD have happened. Being comfortable and secure in your work environment is an important point as this not being the case played a part in causing the accident. Good luck with your circular saw use and remember to pay attention to the points mentioned above. In conclusion, make an educated decision on whether you'll use your saw with or without your guard – the manufacturers put the guard there for a reason.

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Physics problem with circular saw blade?

A circular saw blade completes 1230 revolutions in 36 s while coasting to a stop after being turned off. Assume constant deceleration.
(a) What is the angular deceleration?
rpm/s

(b) What is the initial angular speed?
rpm
But how do you solve the problem?

a) The average rotational velocity is the
distance (number of revolutions) / time. (Convert 36 s to a portion of a minute first, I'll explain why in a bit.)
Also you can say
Wave = (Wmin + Wmax) / 2
It came to a stop, so Wmin = 0. Solve for Wmax. In this case Wmax can be called Wo (original rotational velocity), and Wmin can be called Wf (final rotational velocity).

Then Wf = Wo + alpha*t
Solve for alpha, the rotational acceleration. It's asking for units of rpm/s so you needed to put Wo in rpm.

(This should look a lot like equations you used in linear motion studies.)

b) You already have found that.

How to Use a Circular Saw : Understand Saw Blades, How they Work & How to Be Careful Around them