Posted by Indiana Ken on July 11, 2013 at 19:24:40 from (66.249.235.97):
In Reply to: Hillbilly Boom pole posted by Shale on July 09, 2013 at 10:03:12:
Quoting Removed, click Modern View to see
For example: If we assume the 1000 Lb bales are round bales 5 ft wide then the leverage as you call it, or bending momment, would be 5 Ft / 2 x 1000 Lbs = 2500 Ft-Lbs. Since the bale is uniform we can simply treat it as a point load acting at its center or 2.5 Ft. Now if you attach a chain at the end of an 8 Ft pipe, the chain acts as a point load at 8 Ft. The load acting at 8 Ft that equals a bending moment of 2500 Ft-Lbs can be found by: 2500 Ft-Lbs = 8 Ft x Load. Solving for load we have: Load = 2500 Ft-Lbs / 8 Ft = 312.5 Lbs. Therefore, a load of 312.5 Lbs at the end of an 8 Ft pole will result in the same bending moment as a 1000 Lb bale that is 5 Ft wide. The bending moment acts to break or bend the bale spear where it is attached to it's mount. Or, to state the same thing another way: a load at 8 Ft has 3.2 times the leaverage as a bale which acts at 2.5 Ft.
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