Author Topic: Circular Saw Kickback, filmed at 1000 / 10,000 FPS  (Read 202 times)

Offline Mads Barnkob

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Circular Saw Kickback, filmed at 1000 / 10,000 FPS
« on: May 01, 2019, 09:24:13 PM »
I always knew that a circular saw is no joke and a kickback can quickly cost you a finger, broken bones, internal bleeding, cuts or just bruises.

I wanted to do some speed measurements from use of high speed camera and lately I had a little time to set this experiment up.

The result is that a 142g piece of wood is accelerated to 72 km/h in a mere 5 ms, so if it hits you, it is with a force of 112kg at impact (on 5 sq.cm).

EDIT: Speed difference is not speed as I used it in the video, that was an error.

Stay safe!

« Last Edit: May 01, 2019, 11:29:36 PM by Mads Barnkob »
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Offline Phoenix

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Re: Circular Saw Kickback, filmed at 1000 / 10.000 FPS
« Reply #1 on: May 01, 2019, 10:01:29 PM »
Quite shocking how fast the wood gets accelerated. I wouldn't have thought that it actually goes that fast.

If you calculate the kinetic energy of it, it has around 114 Joules! If it hits you with the edge where more energy gets concentrated on a smaller surface area, it could penetrate dangerously deep.

For comparison, a 9mm bullet fired from a handgun has around 400 Joules. Of course, the bullet concentrates the energy way more on a smaller surface area, but as I said, the edge could still penetrate quite a bit.

I would always wear thick clothes when working with a circular saw so the energy gets spread out in case of a kickback.

EDIT: Even though 20m/s quarters the energy, I still wouldn't like to get hit by it.

Greetings
Phoenix
« Last Edit: May 02, 2019, 12:39:36 AM by Phoenix »

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Re: Circular Saw Kickback, filmed at 1000 / 10.000 FPS
« Reply #1 on: May 01, 2019, 10:01:29 PM »

 


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