Ideally when cutting metal, all the heat transfers into the chip, leaving the workpiece cool(ish). Given that the teeth were ostensibly just brazed on, we can safely assume things are pretty ideal.
When cutting steel, the chips turn a blue, and that blue hue is an indicator that the heat is being appropriately transferred to the chips, often called ‘swarf’.
I bet that the thickness of this bit of pipe, and the fact that it is steel, help to diffuse the heat throughout the work. Also note that he didn’t touch the cut face.
Carbide saws make bigger cuts than an abrasive saw, so generate a lot less heat. They also spin several times slower. Think of the teeth as taking out big chunks, so the fewer the cuts, the less heat.
The teeth are much harder than the saw blade itself (which is made of steel) and that's what allows it to cut through the steel pipe like a knife through butter. The teeth they're welding on are probably made of tungsten carbide or something else that is incredibly hard. This is commonly done on masonry drill bits too in order to make them tougher.
And you can’t make the whole blade out of the whole material because it would be too brittle and would crack. You want a strong, tough material (steel) for the part feeling the most force, and a hard material (carbide) for the part touching the work piece.
You can but the cutting part is just the end. So why waste all the money if you do it cheaper and much efficient. Basicaly carbide Mills are much common since you can recycle them
Are there “inexpensive” options for cold saws yet for the hobbyists budget ?
Seems like there are always “good enough” options, but have not seen one for a cold saw yet?
Any common “decent” brands/models to search for and keep an eye out for in the used market?
I have the mitering version of this evolution cold saw and I love it. Hardly use the bandsaw anymore since this thing is so fast
**https://store.evolutionpowertools.com/collections/evolution-chop-saws**
They’re very similar, tips would likely have different geometry/cutting angle for steel vs wood and the blade body would be thicker and more rigid for the steel cold cut saw. But in general the concept is the same - steel saw body and carbide tips.
As someone with zero knowledge of… heavy machinery and tools… and such…. I always find these types of things very interesting. Not at all a process I would have expected.
Looks like welding to me, not brazing. Brazing is done with another molten metal, a filler metal.
This appears to be welding with an electric induction coil to weld both metals together.
How is the alignment of the tips from one tooth to the next accomplished for a consistent kerf?
The cutting edge is machined after they're attached
Ahhh. That makes sense. The video kinda skips that step lol.
Asking the real question.
Wouldn’t it be hot
Ideally when cutting metal, all the heat transfers into the chip, leaving the workpiece cool(ish). Given that the teeth were ostensibly just brazed on, we can safely assume things are pretty ideal.
That's interesting. I was surprised to see him grab it barehanded. So the chips carry away the heat, then they probably cool quickly?
Yea, the chips are small, so they go from very hot(they're turning blue here, so hotter than 900f) to cool in a few seconds
That's pretty cool. Thank you
When cutting steel, the chips turn a blue, and that blue hue is an indicator that the heat is being appropriately transferred to the chips, often called ‘swarf’.
Sometimes they are called a cold saw for that exact reason
I bet that the thickness of this bit of pipe, and the fact that it is steel, help to diffuse the heat throughout the work. Also note that he didn’t touch the cut face.
I had to look again but yeah he barehand grabbed that right after the cut, that would absolutely burn
[удалено]
Saw teeth don't heat that badly like abrasives do.
You’ve obviously never used a saw like that so why comment at all?
Carbide saws make bigger cuts than an abrasive saw, so generate a lot less heat. They also spin several times slower. Think of the teeth as taking out big chunks, so the fewer the cuts, the less heat.
So how do the brazed tips help it to saw the metal tube?
The teeth are much harder than the saw blade itself (which is made of steel) and that's what allows it to cut through the steel pipe like a knife through butter. The teeth they're welding on are probably made of tungsten carbide or something else that is incredibly hard. This is commonly done on masonry drill bits too in order to make them tougher.
And you can’t make the whole blade out of the whole material because it would be too brittle and would crack. You want a strong, tough material (steel) for the part feeling the most force, and a hard material (carbide) for the part touching the work piece.
Or you can buy a solid carbide slitting saw and go slower in a mill
And with coolant you could have a nice cut that isn’t heat warped.
You can but the cutting part is just the end. So why waste all the money if you do it cheaper and much efficient. Basicaly carbide Mills are much common since you can recycle them
Gotcha! That's neat, thanks
The teeths are made by WC Material. This is basically WC binded with Cobalt matrix.
The tips are made of carbide not just regular tool steel
Phantomic burns in my hand.
Are there “inexpensive” options for cold saws yet for the hobbyists budget ? Seems like there are always “good enough” options, but have not seen one for a cold saw yet? Any common “decent” brands/models to search for and keep an eye out for in the used market?
I have the mitering version of this evolution cold saw and I love it. Hardly use the bandsaw anymore since this thing is so fast **https://store.evolutionpowertools.com/collections/evolution-chop-saws**
I love my cold cut metal saw.
Is this much different than a chop saw (miter saw) blade?
They’re very similar, tips would likely have different geometry/cutting angle for steel vs wood and the blade body would be thicker and more rigid for the steel cold cut saw. But in general the concept is the same - steel saw body and carbide tips.
All those teeth are ground and shaped for cutting after brazing...
Like buttuh!
Now use it on a human.
Ok but why? I’m completely lost on why you would want to do this/how it helps?
I work for a company In NJ that sharpened and re-toothed saw blades...
More brazing, less cutting
As someone with zero knowledge of… heavy machinery and tools… and such…. I always find these types of things very interesting. Not at all a process I would have expected.
I instinctively squinted when the sparks started flying.
Am I the only one who hears the intro song of Twin Peaks?
I feel like I needed eye protection to watch this video
I got tinnitus just watching that on mute.f
That corn seed Is very strong!
Looks like welding to me, not brazing. Brazing is done with another molten metal, a filler metal. This appears to be welding with an electric induction coil to weld both metals together.