Videos on TS kickback or catches?

[Evanism]

Does anyone know if there are any high speed videos of table saw kickbacks or catches out there?

Not stuff shot on a handycam, but one of those 1000 frames a second cameras?

Ive been using the table saw today and as I do when working, I think a lot about the design and how things are done. I must have one of those minds that seeks constant improvement and change, because after thinking about how a table saw cuts and how the very blade and its teeth are shaped, it struck me there is a fairly simple way to stop blades from grabbing the wood. Its in a modification of the very design of the blade itself.

So anyone know of one, wonderful. Watching a catch in ultra slow mo will confirm if the hypothesis is right.

[Afro Boy]

Haven't seen a super slow motion close up of the blade, but does something like this help?



Cheers,
Af.

[Mobyturns]

The man is very lucky he still has fingers @ the 3 minute mark. Foolhardy even attempting that stunt.

[Robson Valley]

While you are waiting, I suggest that you find "The Pitching Machine,"
built and operated by Survival Research Labs. The vids are scattered all over the net.
It is a 454cid Cadillac Eldorado V8 engine belted to a couple of slicks
which has a magazine of 12-20 6' pieces of 2x4 which it can fire at 200mph,
about 1/second, at just about anything.
Enjoy.

[ian]

Ive been using the table saw today and as I do when working, I think a lot about the design and how things are done. I must have one of those minds that seeks constant improvement and change, because after thinking about how a table saw cuts and how the very blade and its teeth are shaped, it struck me there is a fairly simple way to stop blades from grabbing the wood. Its in a modification of the very design of the blade itself.

kick-back occurs when the blade as it rises out of the table grabs the wood and throws it forward.

having the blade fully raised for cuts in thin material will help somewhat, but a riving knife (or splitter) protecting the back of the blade is much better

if you decide to pursue this thought please rig up a mechanical feeder of some sort to keep your hands at arms length from the blade while you test your theory

[elanjacobs]

Ian, aren't your hands always at arms length?

I don't see how it's possible to change the design of a blade to prevent kickback. Kickback occurs when internal stresses in the timber are released causing the cut to close on the back of the blade.
You can make the teeth whatever shape you like, but if the timber grabs the back of the blade it WILL get thrown in the direction of rotation unless there is something (like a riving knife) to hold the cut open.

[Mobyturns]

Ian, aren't your hands always at arms length?

I don't see how it's possible to change the design of a blade to prevent kickback. Kickback occurs when internal stresses in the timber are released causing the cut to close on the back of the blade.
You can make the teeth whatever shape you like, but if the timber grabs the back of the blade it WILL get thrown in the direction of rotation unless there is something (like a riving knife) to hold the cut open.

It is a worry when you see so many images of TS's in operation with no riving knife / splitter or guards.

[elanjacobs]

It is a worry when you see so many images of TS's in operation with no riving knife / splitter or guards.

I dare say that's mostly in the US; they're a bit backward when it comes to safety regulations. Most other places require at least CE standard safety gear: riving knife, guards, emergency stops, etc.

[soundman]

There reasons for and the methods of prevention of table saw kick back are pretty well understood.

I doubt very much that there is anything practical that cane be done to the blade that will be anywhere near as effective and the known methods.

cheers