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Author Topic: Question about homemade sawmills  (Read 224 times)

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Offline hackberry jake

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Question about homemade sawmills
« on: August 10, 2019, 04:03:32 PM »
I am in the pondering stage of building a band saw mill. I read that recommended blade tension is around 13'000 lbs per inch. Assuming the teeth on a 1-1/4 blade are 1/4" high. That's 1" of blade. So the blade at the top and bottom of the wheel are tensioned at 13k lbs. That's 26k lbs of force pulling on each band wheel. That's like sitting a concrete truck on your mill frame. The standard semi-truck axle is rated at 20k lbs. Something isn't adding up to me.
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Offline Hilltop366

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Re: Question about homemade sawmills
« Reply #1 on: August 10, 2019, 04:31:18 PM »

Offline JEverettM

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Re: Question about homemade sawmills
« Reply #2 on: August 10, 2019, 04:58:25 PM »
From what I gather, blade tension is in psi (pounds per square inch), which isn't quite the same thing as lbs of force.

Say the cross-section of the blade is bout 1in x 0.045in (thickness), that's only 0.045in^2.

If the tension calls for 13,000 lbs/in^2 (psi), you'd have to multiply that by the cross-sectional area of the blade.

So 13,000lbs/in^2 * 0.045in^2 is only about 500 or 600 lbs of force.

In some of their videos online, Cooks saw mentioned that the spring in their tensioner is rated for 850lbs. 

I'm new to sawmills as well, so I'm sure others on the forum can give you a much more in depth and educated answer.


Online charles mann

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Re: Question about homemade sawmills
« Reply #3 on: August 10, 2019, 06:37:00 PM »
I also inquired about tis type of question in my thread titled dynamic or static and there are links in there, which after scrolling through those links, it was linked to another and another and another. I just read the links till i found most of the info i needed then a youtube vid about the same question, and he explained how to calculate the psi into ft lbs of force. 
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Offline hackberry jake

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Re: Question about homemade sawmills
« Reply #4 on: August 10, 2019, 06:59:20 PM »
I didn't take the thickness of the blade into account. Thanks guys.
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EZ Boardwalk Jr. With 20hp Honda, 25' of track, and homemade setworks. 32x18 sawshed. 24x40 insulated shop. 30hp kubota with fel. 1978 Massey ferguson 230.


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