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log weight?

Discussion in 'Milling' started by Hammered, Jun 4, 2017.

  1. Hammered

    Hammered Well-Known OPE Member

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    Anyone able to calculate the weight of a 3' round log 20' long?
    I estimate it's about 35lbs per cubic foot.
    We uses a 5 ton tirfor yesterday to drag it out of the jungle but the winch was maxed right.
    My calculation was way off.
     
  2. Stump Shot

    Stump Shot Old *pretty boy dipstick of Quality

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    Just the fact that it is dragging makes it hard if not impossible to calculate. Just add pulleys to your cable to add power to your winch. For every part of line you have, it will multiply your winches power that much. One pulley, two parts cable = 10 ton winch, two pulleys, three parts cable = 15 ton winch, and so on.
     
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  3. Stump Shot

    Stump Shot Old *pretty boy dipstick of Quality

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    Also if you can come up with something to put under the front of the log so it does not dig into the earth it will make it a lot easier as well, an old car or jeep hood works well. Anything to make like a sled/ski in the front to keep it up and gliding along the surface.
     
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  4. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Using Tupelo I come up with ~11,100 lbs. Species matters.
     
  5. Hammered

    Hammered Well-Known OPE Member

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    My buddy the math genius said 5500 lbs.
    We broke the shear pin on the tirfor winch that is rated for 10.000 lbs.
     
  6. Hammered

    Hammered Well-Known OPE Member

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    Tree is Guanacaste or parota.
    27lbs per cubic foot dry.
    This tree is still wet so figured 35lbs.
    11000 lbs is possible.
    We had low friction.
    And this tirfor is rated for 10.000 lbs.
    Cable was singing tight.
     
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  7. Hammered

    Hammered Well-Known OPE Member

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    Here's some photos as we progress on this log.
    2"x30"x20' long Bar tops or bookmarked table tops.
    Free hand the face but took 2 attempts before I dialed it in. 20170603_123821_resized.jpg

    20170605_105900_resized_4.jpg 20170605_120807_resized_1.jpg 20170603_050541_resized_3.jpg
    And the red yellow black devils hiding under the logs. They aren't aggressive.
    You Aussies have worse. 20170605_132917_resized_1.jpg
    1st slab with the Alaska mill.
    2 liters per slab with the 3120.
    Not complaining. $2 in fuel is great.
    Have to sharpen with every 2nd pass
     
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  8. Hammered

    Hammered Well-Known OPE Member

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    My weight question has been bugging me.
    The slabs we cut were disc crushers.
    400-500 lbs I guestimate.

    Link and answer to my question we can all use.
    Simple online calculator. Radius x height =
    You have to know what the cubic foot of the wood weighs and multiply the total the calculator gave.


    I had a 3' foot log x 20' long = 142.42 cubic feet.
    I guestimate this lumber wet at 45lbs a cubic foot.
    142.42x45= 6390 lbs

    http://www.online-calculators.co.uk

    Hot the volume tab






    Weight is an important factor in this work we do.
    I have mixed bag of winches and always would wing it.
    Wrecked more than one over loading them.

    Now I can calculate the weight for the right sized rope, sling, cable and winch for the job.
     
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  9. Hammered

    Hammered Well-Known OPE Member

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    Oh ya the bar top Guanacaste is now done.
    Get to hang up the saws for a few days.

    Next step is to get it out of the Bush along with the 2000 plus board feet of Spanish cedar in another cache. 20170614_113103_resized.jpg 20170614_114616_resized.jpg
     
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  10. Deets066

    Deets066 AKA Deetsey

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    I have a log weight chart, it gives you the weight for some common species in your area. Also gives it by the foot for 3 diameters if I remember right
     
  11. Hammered

    Hammered Well-Known OPE Member

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    I found an online site that gives me cubic weights for some of the common exotic woods. Ie Brazilian cherry, Ipe, teak ect...
    There are some here not listed like Madero negro or guachapalin but they are very similar to Ipe when you have to hump it around.
    50-60lbs a cubic foot.
    Fresh cut or dry doesn't seem to change the weight like others.

    The rail road ties here were cut from Ipe, Brazilian cherry and guachapalin by axe back in the dark ages.
    This is as hard & heavy as it gets here and outlast cement.
    Amazing trees and wood.

    My 87 year old friend and neighbor dedicated years to this work when there was a demand and money was good.
    He still has the axes they used in his collection along with a near new 070 wrapped up in a chicken feed sac.
     
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