Strike Up, Struck Up
Strike Up, Struck Up. To bring the surface relief of a numismatic or medallic item to its full intended height by striking in a press with proper dies and proper pressure –or the proper number of impressions (if a multiple-struck item). The pressman is responsible for every piece to be struck during his shift or production run and that they will be fully struck up with all detail intact.. He will frequently examine sample struck pieces (inspection) making sure the relief is as intended.Press setup and running. To begin a press run of a new coin or medal the pressman or pressroom foreman will SETUP the press, and strike a first specimen or two. This is a trial strike and is purposely at a lower impression than anticipated not to break a die during this stage (thus trial strikes are purposely weakly struck). He will increase the pressure until he feels it will be the proper amount to fully strike up the piece. These are the first strike specimens he will examine very closely.The pressman looks for the following: (1) every die cavity is filled, (2) all high points are intact, (3) there has been no die draw – metal flowing into then out of a die cavity – and (4) the dies are not misaligned. During the press run his sample inspections will always check the high points maintaining the relief is fully struck up. In addition he will check that no part of the die has broken, there are no hairline breaks, that the rims are intact and the dies have not rotated. He will use a magnifying glass for this inspection.Multiple striking. Medals that are multiple struck will always exhibit the state not struck up until the final blow. This is very evident in a process set. Only the final blow will have every cavity filled and high points intact (multiple blows are required to move the surface metal to fill every die cavity). Ideally the freshly struck finished piece, either coin or medal, should match the relief of the artist's original three-dimensional model, the galvano pattern or dieshell, though in miniature size. Not Struck Up This oval medal is an excellent example of the metal not filling every die cavity. The shadowy area on the lower reverse is incuse on the medal's surface. Metal from the body of the blank did not completely flow into and fill the obverse die's cavity. Note the congruent area on the obverse. The shoulder is the high point on the obverse portrait, the beard on the cheek is also a high point. These two areas are not fully struck up on the reverse. The force of the strike cause the metal to flow into the obverse die cavities, but the metal had to come form somewhere. In this case the nearest area was the reverse surface. This medal exemplifies the concept important to medallic artists: comgruent mass. Do not place two high relief areas back-to-back on a coin or medal design. For a multiple struck medal (which this is) the problem is easily solved by softening the piece (by annealing) placing it back in the press for another blow or two. All multiple struck medals will exhibit some form of not being fully struck up – until their final blow.
excerpted with permission from
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor