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<p>[QUOTE=&quot;Clawcoins, post: 3384024, member: 77814&quot;]of all the machining I used to do in the past and use of coins for various tests (aka, damaging the wazoo out of them) and using them as buffers, I&#039;ve never quite figured out why one would grind down a coin.&nbsp; But there&#039;s so many that we see it&#039;s obvious there was a reason ppl would do this.&nbsp; With the little drill hole in the middle I would think it was glued to something at some point.</p><p><br /></p><p>coins were cheap to test new drill bits on though to see how well they cut through.&nbsp; For instance comparing various small annular bits vs hole or regular drill bits to see which is best at leaving no cut through burrs.&nbsp; ahhh ... someone reading this is having a convulsion ... <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie30" alt=":bucktooth:" unselectable="on" unselectable="on" /></p><p><br /></p><p><br /></p><p>now that I think of it ... maybe someone used a forstner bit on that?[/QUOTE]</p><p><br /></p>

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