help sizing designing realization jib crane for parallel lathe

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hi, I should build a jib crane boom to lean on a reinforced concrete pillar to lift heavy mechanical parts to be installed on a parallel lathe to be machined
the dimensions are height under hook 3 meters, boom length 3 meters reach 500 kg
I would like to make it in suitable steel beams (what section to use?). how to make the revolving bearing hinge that binds the pillar upright to the boom with hoisting hoist you have ideas to suggest thanks