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Some years ago, I won a german made bandsaw. I always have to order blades for it 88". Anyways, I've never been sure about the tension I should tighten them to - should they make a wow when you press your finger against the side or be really firm?(when the machine is off, of course. :c}
 

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Based on my experience with metal bandsaws, you want it tensioned enough so the blade tracks straight while cutting, but not extremely tensioned where you start wearing the coating on the wheels and pressuring the wheel bearings.
Wood bandsaws are the same but have higher speeds.
 

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I like to just press against the blade on the back side where there's no guides when you open the door to the top wheel. If it deflects about a quarter of an inch with a firm push with my finger, it's tensioned right. I know one guy who twangs it like a guitar string until it sound right. It just takes a little practice. If the blade is cutting straight, at a good feed rate and not burning or wandering around, it's probably good. If you push the blade and it just feels real tight, no spring at all, it's probably too tight. I think there's some gauges on the market, but I don't know how they work.
 

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Depending on the width and thickness, and wheel diameter.
Tightening force should be in accordance with the material of which is made saws (HCR hardness, as well as tightening force)
One of the most important things is the "step" of teeth, the smaller tower, the large soft and wet
Tummy vary by wood species, moisture,
Additionally, I could send forces to the table for tightening certain width and thickness.
Certainly vary and the type and tensile force the material from which the (Cr C 70, C 60 …)
Tensile strength of 1340 Nmm2 to 1400 Nmm2
Depending on the manufacturer recommends tightening force (Udeholm, Sandvik ….)
If you tell me the width and thickness of bandsaw and type of wood (density, humidity), I could recommend you go to that limit.
Something else, because elongation of material in the course of work to add more force .
 
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