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Thread: Log Weights

  1. 09-27-2006, 09:42 AM #1
    DDM
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    Log Weights

    http://gear.sherrilltree.com/pdf/weightchart.pdf
    Calculator
    http://gear.sherrilltree.com/pdf/Log_WeightChart.pdf
    Last edited by TreeCo; 06-01-2008 at 06:37 AM. Reason: Change the link for weight chart.
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  2. 09-27-2006, 10:49 AM #2
    LightningLoader
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    interesting....
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  3. 09-27-2006, 05:07 PM #3
    ddhlakebound
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    Interesting and handy.....gonna print out a copy to keep in the truck.

    On the Dept. of the Interior "Weight of Green Logs" chart, at the top, it says weight per linear foot, I believe that should be weight per cubic foot.
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  4. 09-27-2006, 05:46 PM #4
    John Paul Sanborn
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    Quote Originally Posted by ddhlakebound
    Interesting and handy.....gonna print out a copy to keep in the truck.

    On the Dept. of the Interior "Weight of Green Logs" chart, at the top, it says weight per linear foot, I believe that should be weight per cubic foot.
    No it's the weight of a cylindar which uses the cuft weight (w) in the formula

    (Pi r squared) * h)* w

    So the column under that heading is the value for (w), where the row on the top is the value for (d) which you divide by 2 to get (r)

    On small logs you can use 3 for Pi, but 3.141 is better in bigger ones, or you can be off hundreds of pounds.

    3.141592653589793238462643383279502884197169399375 would be overkill

    I've memorized 3.141592 just to one up my Dad.
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  5. 09-27-2006, 08:03 PM #5
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    Quote Originally Posted by John Paul Sanborn
    No it's the weight of a cylindar which uses the cuft weight (w) in the formula

    (Pi r squared) * h)* w

    So the column under that heading is the value for (w), where the row on the top is the value for (d) which you divide by 2 to get (r)

    On small logs you can use 3 for Pi, but 3.141 is better in bigger ones, or you can be off hundreds of pounds.

    3.141592653589793238462643383279502884197169399375 would be overkill

    I've memorized 3.141592 just to one up my Dad.

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  6. 09-27-2006, 09:20 PM #6
    ddhlakebound
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    Quote Originally Posted by John Paul Sanborn
    No it's the weight of a cylindar which uses the cuft weight (w) in the formula

    (Pi r squared) * h)* w

    So the column under that heading is the value for (w), where the row on the top is the value for (d) which you divide by 2 to get (r)

    On small logs you can use 3 for Pi, but 3.141 is better in bigger ones, or you can be off hundreds of pounds.

    3.141592653589793238462643383279502884197169399375 would be overkill

    I've memorized 3.141592 just to one up my Dad.


    JPS, I understand what you are saying (all except "cuft weight"), but I don't think you saw the column I was referring to.

    The far left column, directly right of the "species" columm is headed "weight per linear foot". This is the column I believe should be headed "weight per cubic foot".

    All the other columns are the listed weight for a one foot section/cylinder of a certain average diameter.

    The math above is the long way of taking the weight of avg. diameter x length in feet to approximate the weight of the log.

    But the math above does not get you all the way there......here's an example:


    Lets use a shagbark hickory log, twelve feet long, 24 inches diameter at the base, 20 inches at the small end, call the average 22 inches diameter.

    using pieR2 to get the square inches of the log, and multiplying by the length to get the volume, in cubic inches

    radius 11 inches, squared = 121 x 3.14159 = 380.13 square inches, times the length, 12 feet or 144 inches = 54738.72 cubic inches.

    Now convert to cubic feet, one cubic foot = 1728 cubic inches, so our log holds about 31.7 cubic feet of wood. Listed at 64 pounds/foot3, the log should weigh about 2028 pounds.

    Now lets cross check:

    The chart lists shagbark hickory of 22 inch diameter one foot long weighing 169 pounds. Multiply by 12, and the log weighs........2028 pounds.

    I've never seen "linear" used to describe mass, volume, or weight.......

    Still think the "linear weight" column header is right?

    edited to change left to right in second paragraph.
    Last edited by ddhlakebound; 09-27-2006 at 09:25 PM.
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  7. 09-28-2006, 12:25 AM #7
    buzz sawyer
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    Quote Originally Posted by ddhlakebound
    Interesting and handy.....gonna print out a copy to keep in the truck.

    On the Dept. of the Interior "Weight of Green Logs" chart, at the top, it says weight per linear foot, I believe that should be weight per cubic foot.
    ddhlakebound, I believe you are correct. The first column should be weight per cubic foot. If it were weight per linear foot, it would have to be for a particular diameter since only one weight is stated. The columns at the right give the weight per linear foot - based on avg diameter. At first I thought the weights were a little high but then I saw this is weight for green wood. There was another chart showing approximate btu's for different woods that included wgt per cubic foot but I can't find it.

    I had seen this chart before but missed this. Good catch!
    The original Buzz Sawyer.

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    to get what they work for, that my dear friend, is about the
    end of any nation. You cannot multiply wealth by dividing it."

    Dr. Adrian Rogers, 1984
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  8. 09-28-2006, 01:55 AM #8
    Ekka
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    I think the woodweb link is for dried log ...

    ,,,, the Sherril one wont open for me, some sort of error??!!

    Good one DDM, got any others, or can some-one maybe save the Sherril one then post it here that way I'm not trying to download from their server.
    www.palmtreeservices.com.au | Stump Grinding Sunshine Coast
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  9. 09-28-2006, 12:32 PM #9
    xtremetrees
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    They dont upload kangaroo Ekka your to far away from us.
    What a handy chart I always wondered what the crane man was a reading. Simple go right into my truck for all to see. Ty much DDM
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  10. 09-28-2006, 05:51 PM #10
    buzz sawyer
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    Quote Originally Posted by Ekka
    I think the woodweb link is for dried log ...

    ,,,, the Sherril one wont open for me, some sort of error??!!

    Good one DDM, got any others, or can some-one maybe save the Sherril one then post it here that way I'm not trying to download from their server.
    Ekka, I was able to open it once. After closing it, I had to reboot to open it again. I may have an old version of Adobe. Tried this repeatedly with same results, even with the copy I saved some time ago. I'm going to try for a newer version of Adobe.
    The original Buzz Sawyer.

    "You cannot legislate the poor into freedom by
    legislating the wealthy out of freedom.... When half of the people get the idea that
    they do not have to work because the other half is going to
    take care of them, and when the other half gets the idea
    that it does no good to work because somebody else is going
    to get what they work for, that my dear friend, is about the
    end of any nation. You cannot multiply wealth by dividing it."

    Dr. Adrian Rogers, 1984
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  11. 09-28-2006, 06:13 PM #11
    DDM
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    Hmmmmm

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    Later,
    David
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  12. 09-28-2006, 06:30 PM #12
    buzz sawyer
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    Aha - very wise, David!
    The original Buzz Sawyer.

    "You cannot legislate the poor into freedom by
    legislating the wealthy out of freedom.... When half of the people get the idea that
    they do not have to work because the other half is going to
    take care of them, and when the other half gets the idea
    that it does no good to work because somebody else is going
    to get what they work for, that my dear friend, is about the
    end of any nation. You cannot multiply wealth by dividing it."

    Dr. Adrian Rogers, 1984
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  13. 09-29-2006, 03:58 AM #13
    John Paul Sanborn
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    Quote Originally Posted by ddhlakebound

    Still think the "linear weight" column header is right?
    You are correct sir, that column should be per cu ft (cubic foot) I habitually drop the space

    From Wikipidia
    Symbols

    There is no universally agreed symbol but the following are used:

    * cubic feet, cubic foot, cubic ft
    * cu ft, cu feet, cu foot
    * ft, feet, foot
    o feet^3, foot^3, ft^3
    o feet/-3, foot/-3, ft/-3
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  14. 09-30-2006, 02:30 PM #14
    jefflovstrom
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    Dude, It is because you are thinking when you was younger, now you are working when you are older.
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  15. 10-01-2006, 06:10 PM #15
    younggun
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    any one notice the chart and the calculator give different estimates for the same peace of wood?

    basswood,36",1' section
    calculator:248 lbs
    chart:297 lbs
    Last edited by younggun; 10-01-2006 at 06:16 PM.
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