Downloaded from https://www.everyspec.com appreciably inferior to the best attainable with cost and effort because every fuze requires de- regard to safety, reliability, effectiveness, or velopment, arawings, jigs, fixtures, inspection compactnes, and in the perpetuation of obso- gages, packaging, and storage space. It is cus- lete items. tomary to make common fuzes interchange- As a general rule, the standard item must able. always be given first preference and must be In some cases interchangeability may be carefully considered. An important reason in neither possible nor desirable.
It would not be fuze design is the cost and time required to economical or feasible to introduce into all qualify new items (see par. 2-2). fuzes certain special features that are demanded When Standards exist for the design of new by special weapons. items, their use is mandatory. Tre dusgner Interchangeability of fuze parts has not always should therefore find out whether a Standard received the attention that it deserves. All of the has been issued, pertaining to his assignment, advantages of multiple usage fuzes are valid for before he begins to work. For example, the con- fuze parts.
Usually, the manufacturer of small tour of fuzes for 2-inch holes is covered by an p-ts designs his parts for his machines and his American-British-Canadian-Australian Standard. know-how. Production engineers are attempting The Standard covers fuzes having 2-12UNS-1A to cut down on the vast number of parts. Ex- threads for artillery and mortar projectiles of plosive components have largely been standard- 75 mm and larger caliber. Fig. 2-2 shows the ized. No doubt, many advrntages will accrue contour required for new point-initiated artillery when similar steps are taken for screws, nuts, fuzes of Type A. Projectile cavity and fuze nose caps, pins, detents, and other sundry parts.
setting-slot dimensions are also covered in this standard. 24.2 NEED FOR FORMALITY Another standard of this type is MIL-STD- 320. It lists the standardized series of dimen- By necessity, standards require formality. In sions for newly developed detonators, primers, a small shop, the proprietor can make an off- and leads. hand dec;sion or a change to improve his product One of the reasons for standardizing fuze without consulting anyone and without causing contours is to enable interchangeability. Maxi. any harm. However, ach shortcuts are det-i- mum interchangeability is a design goal.
Every mental for any large private or Governmental fuze shotld be usable on as many munitions as organization. Here, it is absolutely essential that possible so as to reduce the total number of dif- all ideas be properly documented, that all ferent types of fuzes required. Savings arise in changes be recorded, and that all established methods be followed. NOTE - ALL DIMENSIONS I INCHES r 1 The fuze requirements are expressed as full ,S instructions and detailed specifications. They come from the customer, the Combat Arms, who is not readily available for informal discus- WA-, 01A 'GgLt-O7 & Sion. The customer expects a formal reply.
Ac- , VN , OtA I~ "4X cepted methods of communication are progress OG' W AC reports and drawings. The reports should con- -- tain brief statements of the problem and the I conclusions reached to date in addition tow' _ - disclosure of the progress. Reports on compli- -- cated tasks are enhanced by including an ab- stract, a brief history, a description of the WEIGH? 16 MAY apparatus, a discussion of the methods used, S0o.o.o, - "s.0 and a list of recommendations proposed. It is V 376-NO -. just as important to report failures as to report .97 MAX. successful tests in order to close blind alleys for others. Drawings will fully describe the hard- ware and define the contemplated parts.
Also, Figure 2-2. A Standard Fuze Contour adherence to standards and conventions will * 2.4