This pipe-milling end-prep tool is for beveling boiler tubes
The Esco Wart Millhog (photo) is a pipe-beveling machine that is designed for making repairs to water-wall boiler tubes. It features a rigid-inner-dia. clamping system, and uses titanium-nitride-coated cutter blades to machine carbon steel or highly alloyed tubes without the need for cutting fluids. The machine is able to bevel, face and bore simultaneously, with relatively simple tooling changes, says the company, and it is designed to machine water-boiler tubes with inner dia. from 2 to 3 in. The machine is sealed to prevent debris from entering the tool. It rigidly attaches to the tube with clamps that fit the inner dia. and expand on the mandrel using a self-centering, draw-rod assembly and attached wrenches. The machine is available with both pneumatic and electric motors. It is available for purchase or for rent. — Esco Tool, Holliston, Mass.