| Abstract: | The peculiar problems associated with the plating, and more especially barrel plating, of threaded components are considered from first principles. An experimental investigation into the barrel plating of cadmium has shown that the scatter of thickness on individual items in a barrel load depends more on the average thickness of metal deposited than on any other single factor. The scatter of individual thicknesses increases as the average thickness of metal deposited on the load increases, and a graph has been derived showing the batch average to be aimed for in order to achieve any specified minimum individual thickness. The bearing of these results on manufacturing, plating and inspection practice is discussed, and recommendations are put forward to eliminate some of the troubles at present encountered and to rationalise methods of specifying screw dimensions and plating thicknesses. |
