IntroductionThe value of fine grids, electromarked (1) on to metal sheetsbefore pressing, so that the type and magnitude of the strain developedin the critical region of the pressing can be assessed, is undisputed.Keeler (2), Meyer and Newby (3), and Goodwin (4), have all discussedpractical applications of this technique and Palmer (5) has reviewedthe field and introduced the concept of a relative safety factor (MSF).However it may be useful to see what this 'mark' consists of, how themarking affects the subsequent metal performance, what the limitationsof the process are and other peripherical issues. It is these aspectsof the process which is the concern of this paper.
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