Abstract: A method of manufacturing bipolar plates includes passing a metal sheet through at least one tension roller disposed either upstream or downstream to a BPP forming roll to establish a longitudinal tension on the metal sheet as it passes through the BPP forming roll. A first pair of inner and outer lateral tension features are formed along a first side of the metal sheet and a second pair of inner and outer later tension features are formed along a second side of the metal sheet for use in establishing a lateral tension on the metal sheet as it passes through the BPP forming roll. The inner and outer lateral tension features in each of the first and second pairs have varying or different heights to advantageously provide a more consistent application of the lateral tension to the metal sheet.

Abstract: A drill string for rotary drilling of underground mining machines includes a first elongate drill string member and a second elongate drill string member. The first member has a main section and a male end, and the second member has a main section and a female end. The male and female ends each have respective threads to provide a thread coupling between the male and female ends, the thread coupling enabling the male end to be secured inside the female end such that the male and female ends overlap axially. A thread lead of the respective threads of the male and the female ends are greater than a diameter of the male end and the female end.

Abstract: A drill string for rotary drilling of underground mining machines includes a first elongate drill string member and a second elongate drill string member. The first member has a main section and a male end, and the second member has a main section and a female end. The male and female ends each have respective threads to provide a thread coupling between the male and female ends, the thread coupling enabling the male end to be secured inside the female end such that the male and female ends overlap axially. A thread lead of the respective threads of the male and the female ends are greater than a diameter of the male end and the female end.