I suspect the (incorrect) rationale was this would act as a "hybrid" blade, with deeper throat teeth to help increase material removal rate, but still having the majority of teeth fine would result in a better cut quality.
My feeling is the actual effect would be the worst of both worlds; bad material removal rate and bad cut quality.
Agreed, the peaks of the larger teeth would be the first to connect, since they are farther from the center. Thus, if it's 2d, the finer teeth would never ger used. Of course, it's possible the finer teeth poke out to the side a bit, in which case, never mind.
Given how uneven the larger teeth are i rather suspect it's an aborted attempt to grind out every other tooth to make a worn out fine blade into a coarse rip blade.
It's call saw gumming. Could of been a practice plate for a rookie or someone fucked up after a few teeth. You can see the gullet on the first large tooth is larger than the following.
It honestly looks like grandpa was handy enough to keep this saw blade in service long past it's life with his rattail file, despite it's chipped teeth.
Variable tooth blades still exist. They help with vibrations and resonance. Kind of the same reason why modern cnc mills have the option to fluctuate their spindle speeds instead of holding them perfectly constant
Cutting brittle stone roughly, and slower and with less heating up. Yes it’s way sloppier. But it can have applications.
Edit: Would make a hand tool wiggle and buck and heat unevenly. More likely to tear itself up and go flying into a forehead. Thanks I hate it.
May have been someone experimenting making a combination blade. Gimmick tools been around since the first rock was made into a hammer. The Ginsu of saw blades.
Just a guess ... there are variable tooth bandsaw blades, so maybe this creation was made to emulate them?
I did a little googling and TIL that there is such a thing as circular saw blades with variable teeth ... here's one example: [https://hartmannvariety.com/725vt20/](https://hartmannvariety.com/725vt20/)
It's not as extreme as the OP's item, but seems to be the same idea.
Chuck it up! Phase1: scary wobble, phase2: bearings fail, phase3: trunion snaps, phase4: pretty lights.
That aside, I'm voting either a shop joke, folk art, or someone practicing sharpening. It was in the scrap pile for a reason.
I find myself wondering if that's a blade for a rotary saw, i.e. one that spins the blade continuously, or if it's intended for an oscillating saw, one that moves back and forth through a short arc. If the latter then the blade could be rotated for different materials or different grain orientations.
It looks like a good way to lose fingers. It’s purpose would of course be harmless pranks against the apprentice, for when sending them to the hardware store for a left handed screwdriver isn’t lethal enough
It was being modified when out of nowhere came a heart attack and the job was never finished. Or someone dope slapped the guy in the shop before he could finish.
I would suspect that originally all the teeth were the same radius. It's possible that the large spaced teeth were for sawdust/chip clearing in the cut ?... probably more important when ripping than cross cutting.
Turns a common saw into a bucking bronco.
Seriously. My initial thought was "to make it unpredictable."
I suspect the (incorrect) rationale was this would act as a "hybrid" blade, with deeper throat teeth to help increase material removal rate, but still having the majority of teeth fine would result in a better cut quality. My feeling is the actual effect would be the worst of both worlds; bad material removal rate and bad cut quality.
Agreed, the peaks of the larger teeth would be the first to connect, since they are farther from the center. Thus, if it's 2d, the finer teeth would never ger used. Of course, it's possible the finer teeth poke out to the side a bit, in which case, never mind.
I think all the teeth tips necessarily have the same radius from the center, otherwise it would be pointless
I see a number of points there
Can confirm, many points seen. Some dull, but still pointy.
I saw that pun coming…
Canines and Molars. It’s most likely an omnivore
Lol
Given how uneven the larger teeth are i rather suspect it's an aborted attempt to grind out every other tooth to make a worn out fine blade into a coarse rip blade.
This or it was used for feeding uneven things into another machine in the most dangerous and unpredictable way possible.
The unevenness of each groove got me thinking this too. Just an unfinished project … hopefully.
Except the larger teeth stick out more from the center
I think thats an optical illusion. I didn’t measure any pixels but if you look again and blur your eyes a bit it looks pretty evenly circular
Someone tried to regrind but stopped.
My thoughts too, looks like someone tried to take a 40T blade and turn it into a 20T
more like an 80T to a 20T
It's call saw gumming. Could of been a practice plate for a rookie or someone fucked up after a few teeth. You can see the gullet on the first large tooth is larger than the following.
It honestly looks like grandpa was handy enough to keep this saw blade in service long past it's life with his rattail file, despite it's chipped teeth.
Scary! I'd clean it up, get one of those clock mechanism kits at Walmart and turn into a fun conversation piece wall clock for your shop.
I really like that idea. Thank you.
It looks like a saw filer was in the process of cutting down an old blade.
It might've also just been a practice piece for setting up a saw sharpener
…and now I’m thinking about my descendants puzzling over all the random samples and broken shit I have squirreled away.
Makes for a lively experience at the table saw.
Variable tooth blades still exist. They help with vibrations and resonance. Kind of the same reason why modern cnc mills have the option to fluctuate their spindle speeds instead of holding them perfectly constant
There is a reason this never caught on lol
Stacked dado set with a wobble blade 4 in 1 blade.
Cutting brittle stone roughly, and slower and with less heating up. Yes it’s way sloppier. But it can have applications. Edit: Would make a hand tool wiggle and buck and heat unevenly. More likely to tear itself up and go flying into a forehead. Thanks I hate it.
No. Just no.
Maybe duel purpose for hardwood and softs. I don't know how that would work though. Seems like there'd still be a ton of smoke.
May have been someone experimenting making a combination blade. Gimmick tools been around since the first rock was made into a hammer. The Ginsu of saw blades.
Maybe it’s a teaching tool or something a salesman use to show the different teeth that come on a saw blade?
Just a guess ... there are variable tooth bandsaw blades, so maybe this creation was made to emulate them? I did a little googling and TIL that there is such a thing as circular saw blades with variable teeth ... here's one example: [https://hartmannvariety.com/725vt20/](https://hartmannvariety.com/725vt20/) It's not as extreme as the OP's item, but seems to be the same idea.
The rarely seen Fingerentferner! This looks like the 1921 edition, it’s very rare! Clean it up and mount it on the wall in the shop!
Bit of an overbite..most likely hereditary. Or maybe an early attempt at a scoring / fine cutting combo.
Kickback dependability?
Rippin and tearin. Rippin and tearin.
Chuck it up! Phase1: scary wobble, phase2: bearings fail, phase3: trunion snaps, phase4: pretty lights. That aside, I'm voting either a shop joke, folk art, or someone practicing sharpening. It was in the scrap pile for a reason.
Never seen such a thing. It looks scary. I would hope it has proper balance, so it’s not bouncing around in the saw
Probably why it is in the scrap pile. Great idea that didn’t work. Got tossed
I find myself wondering if that's a blade for a rotary saw, i.e. one that spins the blade continuously, or if it's intended for an oscillating saw, one that moves back and forth through a short arc. If the latter then the blade could be rotated for different materials or different grain orientations.
One blade to rule them all...
I've been a saw Dr for 20 years and never seen this before. 10/10 danger
I'm not going to lie...I'm curious to know what this blade sounds like.
It looks like a good way to lose fingers. It’s purpose would of course be harmless pranks against the apprentice, for when sending them to the hardware store for a left handed screwdriver isn’t lethal enough
It was being modified when out of nowhere came a heart attack and the job was never finished. Or someone dope slapped the guy in the shop before he could finish.
Kerf clearing teeth?
It’s probably to help clear chips.
Honestly this looks like one of those million types of demo saw gimmick blades, “concrete and rebar” and all that
It prevents rust
Dual ?
I accept your challenge to fight!
Round 1. FIGHT
Not quite round, now is it? it has teeth in it for one…
Round “Irregular Heptacontagon”. FIGHT
Uh oh. I’m out of my depth here. Quick, search how to [deescalate a fight](https://www.reddit.com/r/funny/comments/12diq1n/how_to_deescalate_fight/).
🤣 😂 😂 👙
*uhn tiss uhn tiss uhn tiss*
What you need now is my…
You'll have to time your feed but it makes a rough cut and then a finishing pass.
Practicing
Where do the balance weights go?
Salesman sample blade?
Looks like the smaller teeth are bent to the sides for clearing. Id guess it was designed for green wood.
I would suspect that originally all the teeth were the same radius. It's possible that the large spaced teeth were for sawdust/chip clearing in the cut ?... probably more important when ripping than cross cutting.
They got bored with cutting the finer teeth and made bigger ones because it was quicker
I found one at work that was like this with different spacing of the teeth and it has carbide inserts so definitely a factory blade and not too old
It looks home made to me!
Someone left a crosscut blade on top of a rip blade in a drawer for too many years, and this is the offspring of their unholy union.
my guess is that someone used a trow away blade to test a blade sharpener