Portable frog milling machine for use with railroad frog reconditioning and welding table

摘要

A railroad frog positioning and reconditioning table has an I-beam structure designed to support one or more frogs to enable welding repair of defective running surfaces. After defects are repaired with welding material, a portable frog milling machine table is attached to the frog table for positioning of a milling head over the frog which remains on the frog table. The milling head is connected to a support base that traverses the angular iron framework forming the milling machine table through guided sliding movement powered by a rack and pinion drive mechanism. Thus, the milling head cuts the running surface to original profile and an end mill cutting head cuts the frog flange ways to proper profile. The milling head cutting path is movable into straight and angularly offset positions to enable proper contouring.