Rotary base for securing tools to a work table with a cylindrical support base and truncated upper end, in whose interior and concentric thereto, there is a threaded lower cover and a cylindrical base piston and with a truncated upper end with means to secure tools. The base piston is arranged on the threaded lower cover and is vertically displaced on this threaded lower cover through the interior of the support base, actuated by a lifting system between a lower unlocking position in which the base piston rotates freely around its axis with respect to the support base and an upper locking position in which the rotation of the base piston with respect to the support base is locked by means of friction of its truncated upper end against the truncated upper end of the support base.