Tuff tools, which manufactures develops variousa number of special purpose machines, like line boring machine for sugar mills as well as web offset printing press with accuracy of 20 micron, portable flange facing machine to suit wind mill tower manufacturers from 800 mm dia to 2.8 metres dia flange. Now, it has developedoffers a portable plano milling machine a machine for facing in large structuralsstructures in heavy engineering industries which that cannot be otherwise managedhandled in by the normal plano milling machine. This portable plano milling machine allows plates plates of any sizes, fabricated in any structuralsstructures in distance apart from 2.0 m to 4.5 m in x-axis can to be faced with this machine in line, with an accuracy of 0.5 mm. The portable plano milling machine machine, similar to a plano milling machine, can be mounted positioned on the structure and aligned to the face of the plate to be machined. This the tool head or milling head of the portable plano milling machine is driven from one end to other end, 4.0 m away by auto movement in horizontal way in rack and pinion. Depth of cut is given by handmanually.