Standardization of motor dimensions

In this paper the author proposes that British manufacturers should collectively standardize overall and fixing dimensions of commercial electric motors covering a range of approximately 1 to 50 h.p. Design within the range quoted having approached finality, it is suggested that the time has arrived when standardization cannot be further delayed without prejudice to our postwar effort to secure a wider market. The advantages quoted for standardization comprise a saving in drawing and erection costs, more prompt deliveries, avoidance of delays, fewer spares, saving of stores space, interchangeability and ease of replacement in the event of breakdown. Suggestions are made as to the dimensions it is desirable to standardize, and attention is called to the importance of fixing a standard position for the terminal block. Objections which have been advanced against the proposal are considered and answered. These comprise the cost of re-drawing and re-tooling, disorganization of production, restriction of development, loss of sales points and the fact that there will be no immediate gain. Reference is made to work already done, and it is suggested that delay may have resulted from there being two schools of thought, one connecting standard dimensions with output and another concerned with laying down standards for frame sizes. The degree of standardization already achieved in the U.S.A. is considered, and the paper concludes with remarks upon the possibility of standardizing control gear.