08-02-2015, 11:54 AM
You're right Arvid "swings and roundabouts" I'm looking to see how short the legs have to be to lift approx 130 lbs (60 kgs) with the inner part of the jib fully extended. The 130lbs is my 3ton arbor press which is about the heaviest item that gets lifted on and off the bench.
Surprisingly shortening the legs so that the wheels are directly underneath the junction between the outer and inner parts of the jib and the jib horizontal the 130 lbs is lifted without the crane tipping forward. However I can pull down on the jib and it will tip, still have to look at it some more.
Another way I was looking at it was to "wind" the inner extended jib in once the Item has free space underneath it thus reducing the tipping effect.
I think at the end of the day it will be a compromise.
DaveH
Surprisingly shortening the legs so that the wheels are directly underneath the junction between the outer and inner parts of the jib and the jib horizontal the 130 lbs is lifted without the crane tipping forward. However I can pull down on the jib and it will tip, still have to look at it some more.
Another way I was looking at it was to "wind" the inner extended jib in once the Item has free space underneath it thus reducing the tipping effect.
I think at the end of the day it will be a compromise.
DaveH