BAR

770 139 31 BAR Located on the feed beam, this BAR acts as a guide rail for the drifter cradle. Its primary job is to maintain precise alignment as the rock drill travels forward and backward. By providing a true, straight surface, it prevents the drifter from twisting or wobbling, which is critical for drilling straight holes and reducing stress on other feed components.

A straight and unworn guide BAR directly impacts drilling efficiency and equipment life. If the BAR becomes bent from rock falls or worn from friction, drilling accuracy suffers immediately. This misalignment can cause the drill steel to bind in the hole, leading to lost time and potentially dangerous situations. It also accelerates wear on the cradle slides and the drifter itself, leading to more frequent and costly repairs.

Inspect the BAR for straightness and signs of deep gouging or uneven wear during routine maintenance. A key symptom of a problem is excessive play in the drifter cradle as it moves along the feed. If the BAR is bent, it should be replaced, as attempting to straighten it can weaken the material and lead to a sudden failure.