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Separate cutting time from clearing and core recovery, then inspect the complete barrel before changing the cutters. A diagnosis sequence connecting packed material, wear patterns, guide condition and companion tools to a focused, measurable follow-up.

Relate the rig’s pressure display to the actual loading system, establish stable rock contact and assess changes in rotary-head speed against useful penetration. A practical sequence for parameter trials, clearing and inspection without treating one site’s settings as universal.

Control the complete roller-bit installation from ring condition and tack positioning to heat protection and final inspection. A strong weld alone cannot establish the correct cutting path or confirm that the assembled bearing and seal remain fit for service.

Understand what Mohs hardness, UCS, abrasivity and fractures do—and do not—tell you when comparing roller bits, bullet teeth and complete drilling tools.

Recognise crystals, grains, shells, layering and weathering before choosing a drilling tool. Real reference photos explain the clues and their limits.

A ten-position site inspection shows how to plan selected roller-bit replacements, review the surrounding barrel and identify the mounting and parts to order.

Separate project metres, tool advance and individual roller-bit exposure. Use numbered positions and a replacement log to make wear and cost comparisons meaningful.

Original photographs, a 22.5 m inspection annotation and an insert section show how supporting steel, cutter placement and entry behaviour were reviewed together.

Hand rotation checks movement; it does not measure bearing fit. Inspect the journal, mating bores, seal seat and assembled movement against the selected drawing.

A useful material file links the steel grade to the cone or leg, then to treatment and finished-part records. The component identity comes before the test numbers.