WS39 casing tooth
JM cutter tooth
B47K22 bullet toothRESOURCES
Choose, install
and troubleshoot.
Practical guides for roller bits, core barrels and cutting teeth. Find the checks, drawings and field observations that help with your next decision.
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Tool selection
Identify the ground, match the mounting and prepare the right information for a quote.
TECHNICAL GUIDE
Weld-on or replaceable roller bits?
Compare welded legs, matched holders and bolted systems. Confirm the existing interface, installation access and the parts you need supplied.
Read the guide
TECHNICAL GUIDE
Core-barrel quotations: dimensions and connections
Bring the required cutting diameter, rig connection, ground information and supply scope. Existing-tool photos help when replacing an assembly.
Read the guide
GROUND & SELECTION
Rock strength, abrasivity and tool selection
Compare published UCS test values for eight rock types, then separate strength, abrasivity and fractures in your tool selection.
Read the guideSpecific parts & applications (3)
Rock identification
Rock identification on site
Compare crystals, grains, weathering and photographed rock textures.
Component checks
B47 teeth, holders and retainers
Check the full tooth reference, shank, holder seat and retention parts.
Component checks
Ordering WS39 teeth and mounting parts
List the tooth profile, holder and pins separately in the enquiry.
Installation & operation
Position the cutters, check the complete barrel and plan how the tool will work.
ROLLER-BIT PRACTICE
Roller-bit installation: position, weld and inspect
Check ring condition, roller-bit position and welding heat protection before final inspection of the complete cutting assembly.
Read the guide
ROLLER-BIT PRACTICE
Roller-bit operation: load, RPM and the drilling cycle
Relate rig pressure readings to tool loading, then review rotary-head speed, penetration and clearing during controlled parameter trials.
Read the guide
TECHNICAL GUIDE
Core-barrel layout: cutting paths and staged drilling
Establish the outer cutting path, steel-ring reference and inner cutting path separately, then check radius, projection and orientation from one centre.
Read the guideInstallation details & field examples (2)
Repair planning
Inspect the barrel before fitting new roller bits
Check the cutting ring, shell and guides before agreeing the repair scope.
Workshop record
Positioning sixteen roller bits on a 1,800 mm barrel
Follow the workshop layout and rechecks before the cutting ring is completed.
Troubleshooting
Start with the symptom. Compare wear, cutting behaviour and the condition of the complete assembly.
TROUBLESHOOTING
Roller-bit failure: missing cones and insert damage
Identify what is missing, inspect the remaining leg or cone, and collect the photos and operating record needed for a technical review.
Read the guide
ROLLER-BIT PRACTICE
Slow drilling: cutting, clearing and core recovery
Separate cutting time from clearing and core recovery. Packed material, wear patterns and guide condition help identify the next check.
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TROUBLESHOOTING / ROLLER BITS
A jumping barrel: inspect the whole cutting assembly
Review cutters, scrapers and spoil guides together. Their relative geometry and the operating context help narrow the causes of jumping.
Read the articleInspection methods & field examples (3)
Inspection method
Map wear before replacing roller bits
Keep the position, replacement history and drilled metres with each inspection.
Wear guide
Read uneven bullet-tooth wear
Compare tooth condition across the complete cutting assembly.
Inspection method
Inspect bullet teeth through a field trial
Keep stage-by-stage condition and replacement records with the drilling log.
Materials & quality
Understand the component, the inspection and the records to request with your order.
Workshop photographMANUFACTURING & QC
Roller-bit manufacturing: from steel to assembly
Follow a historical MH-3 example through cone and leg materials, hardfacing, heat treatment, finish machining and assembly-fit inspection.
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TECHNICAL GUIDE
Roller-bit quality: inspection and traceability
See actual journal inspection and the cone, leg and assembly checks to include with an order.
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TECHNICAL GUIDE
Cutter-tooth inspection: dimensions and brazed joints
Two historical JM samples show dimensional checks and brazed-joint inspection. Acceptance limits must come from the current part drawing.
Read the guideMaterial & assembly checks (2)
Material records
Match steel reports to the cone or leg
Keep the material grade tied to the correct component and its records.
Assembly checks
Bearing fit beyond a freely turning cone
Review the fit and assembly checks behind the roller cone’s movement.
News & events (6)
Site support, company updates and exhibition announcements. Read our No-Dig Live 2026 preparation update.
SITE SUPPORT · 2026
Saudi Arabia: on-site roller-bit installation support
On-site guidance on installation, welding and use.
MEET DRILLNOVA
No-Dig Live 2026
- Dates
- 29 September–1 October 2026
- Venue
- NAEC Stoneleigh Park
- Location
- Kenilworth, United Kingdom
- Stand
- 118
MEET DRILLNOVA
bauma CHINA 2026
- Dates
- 24–27 November 2026
- Venue
- Shanghai New International Expo Centre (SNIEC)
- Location
- Shanghai, China
- Stand
- EE.139
Exhibition photographExhibition record
ITTC 2026
22–24 April 2026 · Tianjin, China
View DRILLNOVA’s booth and trenchless tooling display in its official ITTC 2026 exhibition gallery.
Read on drillnova.com
Event announcementArchived announcement
No-Dig India Show 2025
28–29 November 2025 · New Delhi, India
DRILLNOVA’s archived exhibition announcement for No-Dig India Show 2025, introducing its HDD and trenchless tool range.
Read on drillnova.com
Event announcementArchived announcement
bauma CHINA 2024
26–29 November 2024 · Shanghai, China
DRILLNOVA’s archived bauma CHINA 2024 announcement, covering foundation drilling tools, roller bits and bullet teeth.
Read on drillnova.com