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<p>[QUOTE=&quot;Conder101, post: 926581, member: 66&quot;]Assuming you are talking about rotated dies, as hobo said the dies after hubbing are steel cylinders.&nbsp; Now if you used a set screw pressed against a steel cylinder it wouldn&#039;t take much vibration before te die started rotating.&nbsp; To prevent that they grind a flat area down the side of the die body. (You can see this flat side on the state quarter dies the mint sold.)&nbsp; It is easier to lock the setscrew against the flat, and even if the screw loosens a bit the die still can&#039;t rotate.&nbsp; But these flats are ground on the die by hand.&nbsp; So say they are supposed to be at 6 o&#039;clock, but the mint worker doesn&#039;t get it ground at exactly 6 o&#039;clock.&nbsp; Say he grinds it at the 5:30 position instead.&nbsp; Now when the die is placed in the press and the set screw is tightened against the flat, the dies will be rotated 15 degrees off from where they are supposed to be.&nbsp; Sometimes the technician doesn&#039;t pay attention and grinds the flat well off from where he should.&nbsp; Sometimes the setscrew can vibrate out completely and the die can rotate.&nbsp; </p><p><br /></p><p>Mint tolerance allows a 15 degree rotation so as long as the flat is ground somewhere between 5:30 and 6:30 the rotation will be within tolerance.</p><p><br /></p><p>In the early mint the setscrews were simply pressed against the cylindrical body and some issues can be found with various rotations, and in some cases the dies were removed for polishing and then put back into the press with a different rotation.&nbsp; A good example of this is the 1807 S-276 large cent.&nbsp; While this coin can be found rotated to most any position most of the coins come in one of three positions because the die was removed for polishing twice and replaced with a different rotation.[/QUOTE]</p><p><br /></p>

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