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drawing force less than there are mainly two reasons: 1. Within the inner hole accuracy is not enough, size is too large or loudspeaker hole; 2. Poor inner hole finish; At present we adopt Taiwan imported precision automatic lathe, spindle speed can be as high as 8000 r/min, so the precision and smoothness than rivals, inner hole accuracy can reach 0. 01, bright and clean degree can reach Ra0. 8.
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