Message:

<p>[QUOTE=&quot;Oldhoopster, post: 2930141, member: 84179&quot;]The blanks went into a furnace to be annealed, not dried.&nbsp; Annealing is step that increases ductility of the metal</p><p><br /></p><p><br /></p><p>Nearly all materials expand upon heating and contract on cooling (there are a few special cases due crystal phase changes and other funky stuff).&nbsp; Coefficients of Thermal Expansion for common metals are well studied.&nbsp; If I did my math correctly a quarter will expand (linearly) slightly less than 0.001&quot; (1 thousandth of inch) for every 100F it is heated, and contract equally when cooled. </p><p><br /></p><p><br /></p><p>Hands on, personal experience and observations can be very valuable.&nbsp; But if you don&#039;t speak the language, then you can make some significant translation errors when listening to what the coin telling you.</p><p><br /></p><p>I suspect that you can find some good metallurgy sites that explain ductility, work hardening, and Thermal expansion, without getting into heavy math or chemistry.&nbsp; If you&#039;re really interested, some of this stuff could help supplement your hands on experience[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in