Kapex blade , Who knows ?

[pierreblonde]

I was looking at a the Universal kapex saw blade  blade on ebay last night and thought that doesn't look right I've never in all my years seen a blade like it
I took mine out my kapex today and mine is just the same the teeth are all different size but with no rhyme or reason as i cannot work any sort of repetitive pattern out. I have never noticed it before  i wonder if its got anything to do with noise reduction ?? any ideas

have a look closely at the picture

 

[WarnerConstCo.]

It is all to do with the way the blade was designed.

I have a couple that look even more funky.

 

[pierreblonde]

How was it designed then ? freehand ! [scared]
or a cross between my teeth and head stones in a grave yard

 

[WarnerConstCo.]

How was it designed then ? freehand ! [scared]
or a cross between my teeth and head stones in a grave yard

I'm sure they made it like that for a reason.  Whether it was Festool behind it or Leitz, I don't know.

 

[jonny round boy]

The differential spacing of the teeth helps to stop any vibration.

Imagine a blade with equally spaced teeth, spinning at a constant speed. The teeth are hitting the material at equal spacings - thud......thud.....thud......thud......thud; now imagine the teeth aren't spaced equally, it's more like - thud......thud..thud....thud......thud..thud....thud; because the impacts aren't at a consistent frequency, any vibration is much less likely to resonate.

Probably not the best description, but hopefully it helps! [huh]

 

[Craftsman]

Now we need to know the real reason it was designed the way it was. [huh] [big grin]

 

[pierreblonde]

The differential spacing of the teeth helps to stop any vibration.

Imagine a blade with equally spaced teeth, spinning at a constant speed. The teeth are hitting the material at equal spacings - thud......thud.....thud......thud......thud; now imagine the teeth aren't spaced equally, it's more like - thud......thud..thud....thud......thud..thud....thud; because the impacts aren't at a consistent frequency, any vibration is much less likely to resonate.

Probably not the best description, but hopefully it helps! [huh]

Would that not make any vibration worse  :-\ you would think it would be out of balance ? and then why are all festool blades not like that?
i've never seen it before from the blades i've had  leitz,trend ,cmt, freud, im sure there be a reason , you could be right

 

[Deke]

In his youth, Johann Festool III had a crush on a girl, but she was poor and her family could not afford to braces to fix her uneven smile. Johann loved her still and always told her she was beautiful. They were soon married. Later when he was rich and could afford the best German dentists, he never asked his wife if she wanted to fix her uneven teeth. He designed this blade to honor his wife.

 

[Alan m]

[big grin] [jawdrop]

 

[USPcompact]

Would that not make any vibration worse  :-\ you would think it would be out of balance ? and then why are all festool blades not like that?
i've never seen it before from the blades i've had  leitz,trend ,cmt, freud, im sure there be a reason , you could be right

The teeth are likely designed that way to impede harmonic resonance.  If the teeth were the same size and regularly spaced, an "x" amount of harmonic resonance would occur at a certain blade speed and cause the blade to wobble.  Whether this blade speed is within the operating range of a saw could vary with blade design.  Wobbling blades result in a degradation of cut quality.  By having irregularly spaced and shaped teeth, the potential for harmonic resonance is reduced, and the likelihood of a clean cut is increased. 

And, AFAIK, most of the finer-toothed "Festool" blades share this type of design.  I noticed a similar pattern on the stock blade that came with my TS55. 

 

[Brice Burrell]

The teeth are likely designed that way to impede harmonic resonance.  If the teeth were the same size and regularly spaced, an "x" amount of harmonic resonance would occur at a certain blade speed and cause the blade to wobble.  Whether this blade speed is within the operating range of a saw could vary with blade design.  Wobbling blades result in a degradation of cut quality.  By having irregularly spaced and shaped teeth, the potential for harmonic resonance is reduced, and the likelihood of a clean cut is increased. 

And, AFAIK, most of the finer-toothed "Festool" blades share this type of design.  I noticed a similar pattern on the stock blade that came with my TS55. 

Hmm, where have we heard this before??  Oh yeah, Jonny just posted this same response. [poke] [big grin]

BTW, your user name is another finely engineered and manufactured German piece. 

 

[jonny round boy]

Hmm, where have we heard this before??  Oh yeah, Jonny just posted this same response. [poke] [big grin]

Yes, but his explanation sound vaguely scientific, whereas mine just sounded like a brain fart [eek]

 

[pierreblonde]

In his youth, Johann Festool III had a crush on a girl, but she was poor and her family could not afford to braces to fix her uneven smile. Johann loved her still and always told her she was beautiful. They were soon married. Later when he was rich and could afford the best German dentists, he never asked his wife if she wanted to fix her uneven teeth. He designed this blade to honor his wife.

Im going with Deke's answer for the time being  [laughing] [laughing]

 

[Rick Christopherson]

The two answers regarding vibration and resonance are correct. It is a design feature that Festool mentions when extolling the benefits of their blades, so I am kind of surprised that more of the forum members hadn't already heard this. Granted, with all the work I have done handling and documenting the saw blades, I had actually never even noticed it before, until Rick Bush told me about it some time last year.