The invention relates to a transportable tower intended in particular for machining a shaft at a work site. It comprises two clamping rings (12, 13) which are designed to be centered at spaced locations along the tree to be machined. A plurality of guide bars (42, 44, 48, 50) extend between the clamping rings (12, 13) and slidably support a gripping assembly (52). A cutting tool holder (80) is mounted on a rotating annular portion (58) of this assembly (52) so that when the movable ring is moved, the tool holder performs orbital motion relative to the shaft. machined.Application area: Turning of cylindrical workpieces, etc. / P
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