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Systems and Equipment - 42Downhole Tools<strong>OnGrade</strong> Operator’s <strong>Manual</strong>Downhole ToolsPilot Bore• Endload beacon housing: provides moretorsional stiffness and more uniform beaconsignal strength regardless of roll positioncompared to sideload housing.• Pocket bit (1) or slant-faced head withgrade Tuff bit (2): both cut a hole slightlylarger than the diameter of the beacon housingfor a straighter bore path. The pocket bit isuseful in stiffer soils and the grade Tuff bit isuseful for steering in soft soil conditions.e14om025t.eps21• Grade adaptor (tailpiece): holds rear end ofbeacon housing centered in the bore hole togive truer pitch readings.e14om024t.epse14om026t.epsCMW
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