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Flange grooves

Flangeway. Harmful space. Also called “unguided space” or “harmful interval”. In a tournout is the space, between the intermediate rails applied to the “heels” of the needles and the tip of the heart, in which, for a wheel of each axle, the support of the edge to the mushroom is missing during the passage of the wheel itself from the intermediate rail to the tip of the heart. to be sure that the “unguided” edge can be routed to the opposite side to that determined by the position of the needle frame in this area, the guiding rails are applied to the two outer rails, which guide the edge of the wheel opposite to the one that affects the tip of the heart, binding it between the outer rail and the guiding rails

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