Home > Term: double spiral cut
double spiral cut
A cylindrical drill-round cut whose spiral hole pattern gives the widest opening and permits opposite holes to be ignited successfully. This gives the best cleaning of the opening and safety in the advance is increased, since one section of the double spiral can give breakage irrespective of the other.
- Kalbos dalis: noun
- Pramonės šaka / sritis: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)