Special processing device for worm rack

The utility model discloses a special processing device for a worm rack, the special processing device is formed by improvement of a current horizontal lathe, a cylindrical boring bar is installed between a chuck of a main cabinet and a tip of a tailstock, a cutter clamp of the boring bar is provided with a cutter, the lower half part of the boring bar is provided with a central rack, a workpiece jig is installed on a slide carriage, and a workpiece is installed on the workpiece jig. A grating counter can also be installed at the front end of the workpiece jig, and a digital display is connected with the grating counter via a lead. The special processing device is advantaged by, primarily, simple processing technology, few use devices, convenient operation, and saving of a lot of time during whole processing process, secondly, high processing efficiency, the processing time of each part being shortened by 30% compared with the prior art and thirdly, high processing precision.