viseMove.py

import Draft
from FreeCAD import Vector

'''
moves object upper left hand corner to origin
with top surface of part at z=0
'''

sel=Gui.Selection.getSelection()

Xmin = sel[0].Shape.BoundBox.XMin
Ymax = sel[0].Shape.BoundBox.YMax
Zmax = sel[0].Shape.BoundBox.ZMax

xmove = 0 - Xmin
ymove = 0 - Ymax
zmove = 0 - Zmax

Draft.move(sel,Vector(xmove,ymove,zmove))
App.activeDocument().recompute()