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Compare core barrels, rock augers and drilling buckets by cutting, material removal and recovery. Then match the cutting system to rock and rig conditions.

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.

Diagnose slow roller-bit core barrel progress by separating cutting, clearing and core-recovery time. Check packed cuttings, cutter condition, ground changes and actual operating readings.

Check the cutting ring, position and tack the complete roller-bit layout, protect bearings and seals during welding, then remeasure before returning the barrel to service.

Follow a January 2024 workshop layout for 16 roller bits and four scrapers. See how cutting diameters, ring reference and cutter-level checks were kept separate.

Inspect the cutting ring, old openings and spoil guides before fitting new roller bits. Confirm repair scope and drawing references before copying the worn layout.

Check when core barrel vibration starts: rock contact, after welding or cutter replacement, or at a new layer. Review the complete tool geometry and operating record before adjusting settings.

Record numbered tooth and holder condition at each trial inspection. Connect replacements, angle checks and recovered rock to the drilling interval and time.

Keep the complete B47 reference, then match the shank, holder seat and retaining parts. A replacement enquiry should identify each component and its quantity.

Match the WS39 tooth profile, holder seat and pins before ordering. List teeth, holders and retaining parts separately so the quotation defines a complete supply scope.