Need help from machine experts

I was sawing a log about 10 inch in diameter that I found about a year ago. I’m unsure as to what species it is but it had lots of spalting and I thought it make some great boxes. I couldn’t save any of the spalted areas sadly. As I was resawing bang the blade broke right on the weld.

So what caused the breakage? The blade is 1 inch wide 4tpi. The bandsaw is a 2 hp single phase and wasn’t struggling in the cut. The teeth are sharp as the blade is new.

Any ideas would be helpful and any advice as how to avoid blade breakage would be great.

8 thoughts on “Need help from machine experts

  1. How big is your band saw and how thick is the blade? I am no expert, but I believe that the thickness of the blade is important with respect to the radius of the wheels – the thicker the blade the less easily it will conform to the wheels. As the blade is bent twice with each revolution, a thick enough blade can rapidly experience metal fatigue, in much the same way rapidly bending a piece of metal in your hands back and forth is enough to separate it. And obviously the weld is a weak point.

    Again, I really have no clue here – I only just bought my first “real” band saw a few months ago. But I recall coming across this when doing my research.


  2. When encountering anything of this type ie cutting edges, saw blades, etc I have found a decent sharpening service is a great source of advice. Only caveat, you have to get the right person there with the knowledge to properly diagnose and explain the issues, if they are willing . The other problem I have encountered is that some of the companies have excellent knowledge in some specific areas and not so much in others. Did you have a chance of talking to the distributor or manufacturer of the blade, or is that not an option ? A willingness to back a product can help a lot for the end user.

    Liked by 1 person

    1. Gave you are so spot on. There are only two sharpening services in my locality. One has been bought out and the crew replaced. They have no clue as to what they’re doing. The other is a one man show and he knows but has very little patience for people. My best option was to throw it up on the web and see what bites.


  3. I would say the weld wasn’t properly annealed when it was made. If the blade is too hard at the weld it will snap. It could also have been a bad weld. If the blade is still sharp get it rewelded.


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