When Does Hard Turn/Grind Make Sense? : Modern Machine ShopApr 15, 2002 . Hard turning and grinding, which are finishing operations, are being . We talked to two manufacturers of turn/grind machines, Index.hard grinding machine,DIY Grinding Machine by HDD(hard drive) - InstructablesThe progress is pretty simple, but the product is really amazing.Material: HDD, sand paper(roughness depands on what kinds of grinding you want), double-side.
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