Re: How well does a 3 point. Pole Boom work?

Posted by T_Bone on March 21, 2005 at 08:31:53 from (4.240.42.162):

In Reply to: How well does a 3 point. Pole Boom work? posted by Obie on March 21, 2005 at 05:11:54:

Hi OB,

A boom in nothing more than a first class lever.

A 500lb dead load weight extended 4ft is now a 2000lb load weight, at 8ft a 4000lb load weight.
500x4=2000, 8x500=4000

The reverse is also true as the boom to tractor attachment point has 2000lb dead load weight if the load weight is 4ft behind the tractor. This is what the boom/tractor structure see's at that attchement point.

Live load weight is the dead load weight when moving. It's NOT uncommon for live load weight to be 4 times dead load weight.

So now our tactor attachment point has 8000lbs of applied force when moving. 2000x4=8000

Then we use a safety factor of 1.5 times so now our tractor attachment point has a design rated single point of attachment at 12,000lbs.

To put this into prespective, a rated 250ton crane can easyly pick 25,000lb dead load weight, but ask that crane orperator to travel with that 25000lbs and he'll cringe really bad at that suggestion and may refuse to travel with that load. This is mostly from the road surface he must travel on.

Take a 250ton rail crane and he will travel as well swing the load as he travels with no problems what so ever.

Never get "any body part" under a load! Period!

T_Bone

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