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Truing a 12" sanding disc: YYC
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<blockquote data-quote="RobinHood" data-source="post: 52919" data-attributes="member: 696"><p>So that indicates that you have integrity throughout the disk ==> no crack. If you support the disc in the center by hand, you will get a better ringing sound as the string, the way you have it attached, touches the circumference and attenuates the sound.</p><p></p><p>So I think we can conclude that your disc is made from CI, has no crack, but is slightly bent because of an impact force deforming it (or the CI has stress relieved over time causing the observed warp).</p><p></p><p>facing the surface will true it to the bore ==> what you are after.</p><p></p><p>I can turn it on the lathe, but my balancer is too small (I can balance a wheel up to 8” on my set-up).</p><p></p><p>You would need to find a way to balance the disc.</p></blockquote><p></p>
[QUOTE="RobinHood, post: 52919, member: 696"] So that indicates that you have integrity throughout the disk ==> no crack. If you support the disc in the center by hand, you will get a better ringing sound as the string, the way you have it attached, touches the circumference and attenuates the sound. So I think we can conclude that your disc is made from CI, has no crack, but is slightly bent because of an impact force deforming it (or the CI has stress relieved over time causing the observed warp). facing the surface will true it to the bore ==> what you are after. I can turn it on the lathe, but my balancer is too small (I can balance a wheel up to 8” on my set-up). You would need to find a way to balance the disc. [/QUOTE]
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