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<p>[QUOTE=&quot;GDJMSP, post: 3504649, member: 112&quot;]You got the right kind of idea, but to really understand you first have to realize something. The size of the planchet is exactly the same size as the inside of the collar. When the collar comes into place it is squeezing against the outside of the planchet - and the collar cannot move. So it&#039;s impossible for the planchet to expand, as in get larger in diameter. The diameter remains the same - it&#039;s constant. But it does expand in an upwards and downwards direction into any holes it can find because it is being squeezed, squished if you will, between the dies.</p><p><br /></p><p>You also have to realize that the fields of the die are the high points of the die, so the fields are in contact with the planchet from the very instant they begin to squeeze together. At that point two things happens, the planchet begins to get thinner in the field areas, and the top layers of the planchet, the very top of the metal, begin to flow across the fields of the die.</p><p><br /></p><p>At the very beginning of the movement, the rim gets filled because the metal from the upset is already there, waiting only to be shaped by the constraints of the collar and the shape of the rims of the dies. The letters of the legends get filled next because they are the closest to the fields. And because they are small, they get filled really quickly. In other words, the rim and the legends are the first things filled when the strike occurs. After that the only direction there is that the metal can flow is inwards towards the central devices - and because it is constrained, stopped from moving in the rim and the legends. And metal from everywhere on the planchet flows at that point - all of it moving inwards because the only holes left in the dies are those of the central devices. So that&#039;s where the metal HAS to go, it is still being squeezed, and there simply is no place else to go.</p><p><br /></p><p>It starts to flow across the outer edges of the central devices, and at the same time across the surface of the devices in those locations. Eventually even the high points, or maybe deep points of the dies would be the more correct way to say it, get filled and the metal stops moving altogether. At that point the strike is completed.[/QUOTE]</p><p><br /></p>

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