This paper introduces a principle and practice on milling special shaped spiral rod with non instantaneous pole envelope method.

The rod was a bamboo pole, the hook was converted from a paper pin, the string was cotton sewing thread, the float pulled from a broom, and tooth-paste casing boiled and shaped into a plummet.

When installed, the high-pole lamp is automatically hung in a hook-shaped trough of the hanging hook after raising to the position of the automatic hanging and unloading gear;