Automated changeover tube mill

A continuous tube mill apparatus adapted for quick changeover from production of a first product to production of a second product of a different size or shape, the tube mill comprising a mill base upon which a series of forming units is operably carried for progressively forming a skelp into the finished product, a first sub-base unit upon which forming units for forming the first product are mounted, the sub-base unit being rollingly supported to enable the same to be removably mounted upon the mill base, a changeover module positioned beside and spaced from the mill base, a second duplicate sub-base unit having forming units thereon for forming the second product movably positioned upon the changeover module, bridging means selectively extendable from the changeover module to the mill base, said bridging means comprising a spaced pair of arms having rollers thereon for rollingly supporting the sub-base units for movement between the mill base and the changeover module, and means for removing the first sub-base unit from the mill base across the bridging means to the changeover module and the second sub-base unit from the changeover module across the bridging means into operative position on the mill base.