Based on the analysis of the rotation of cosine drum cam, this paper introduces a special de- vice to mill this type of cam on the ordinary horizontal milling machine.

In particular, Ada programs will be "portable" from one computer to another, and engineers will be able to combine them as bolting Meccano together.

The utility model provides a ring-type workbench for assembling and manufacturing a coal plough disc or a coal unloading disc of a coal unloader, and belongs to tooling for processing machine parts.