The drilling machine of the present invention includes a frame, a tower, a rotary head, and a rotary head guide. The tower is mounted on the frame and includes an elongated member. The rotary head is engageable with the drill string and slidably coupled to the elongated member for movement along the tower. The rotary head guide includes a support, a wear block, a backing bar, and an adjustment mechanism. The support is coupled to the rotary head, the wear block is slidably engaged with the elongated member, and the backing bar is coupled between the wear block and the support. The adjustment mechanism is coupled to the support and engages the backing bar such that adjustment of the adjustment mechanism moves the backing bar away from the support to move the wear block against the elongated member.

La perforadora de la actual invención incluye a un marco, a una torre, a una cabeza rotatoria, y a guía principal rotatoria. La torre se monta en el marco e incluye a miembro alargado. La cabeza rotatoria es engageable con la secuencia del taladro y se junta slidably al miembro alargado para el movimiento a lo largo de la torre. La guía principal rotatoria incluye una ayuda, un bloque del desgaste, una barra del forro, y un mecanismo del ajuste. La ayuda se junta a la cabeza rotatoria, el bloque del desgaste se contrata slidably con el miembro alargado, y la barra del forro se junta entre el bloque del desgaste y la ayuda. El mecanismo del ajuste se junta a la ayuda y contrata la barra del forro tales que el ajuste del mecanismo del ajuste mueve la barra del forro lejos desde la ayuda para mover el bloque del desgaste contra el miembro alargado.

 
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