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link 22.08.2007 12:38 |
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Subject: with less projection Correct tooth spacing is a critical factor in steel tooth design. Soft formation bits (i.e. MX-1) require wide tooth spacing to produce large cuttings for fast drilling and to aid cuttings removal. Medium formation bits (i.e. MX-3) require more teeth with less projection to drill harder formations. Therefore, they usually require more weight on bit (WOB) to drill these formations.
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| менее рельефные |
| с меньшей высотой зубцов (они меньше выступают наружу) |
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