Long metal tubes on dollies in a warehouse

Gun Drilling & Deep Bore Machining

Hunting is the industry leader in gun drilling and deep hole machining.

Product summary

With over 75 years of innovation, our custom designed machines with highly sophisticated proprietary drilling technology reinforces our place and reputation as the industry leader in providing the deepest holes and most accurate positional tolerances.

Dearborn “Leads the Way” in deep hole machining. With over half a century of innovating and perfecting the art of gun drilling, we have a wealth of experience that is un-matched within the machining industry. Innovators since our founding in 1947, everything that we do today has grown from our ability to drill deep and straight holes in long parts or unusual shapes. Whether the requirements are a uniform walled tube, an off-center blind hole, or a bore directed to hit a critical “target” zone, Dearborn has the capability, knowledge, and overwhelming drive to satisfy your needs. We produce the deepest depth/diameter ratios, the tightest positional tolerance, and closest concentricity in the industry. As part of Hunting’s Advanced Manufacturing Group (Hunting AMG), we are dedicated to advancing the capabilities of the industry through innovative drilling solutions, which overcome the limitations offered by conventional bore machining. As a drilling industry leader, we design and build our own gun drill machines, tooling, and related equipment, enabling us master specialized drilling techniques. Our management, engineers, and machinists work continually to improve our processes, procedures, and efficiencies. We are committed to provide our customers with advanced deep hole drilling solutions by producing tighter tolerances, with better finishes, in tougher materials. The scope of our bore machining capabilities include: 3.0mm specialty hydraulic tubing; thin walled pressure housings; uniform wall tubes; pattern-drilling of wire or fluid passages in 30-ft long Oil & Gas formation evaluation tools; large diameter concentric bottle bores for highly balanced turbine engine shafts. With 100+ spindles running shop wide and 140,000 square feet of manufacturing space, whether we are supplying you with highest quality pre-bored “blanks” for finishing in your own machine shop or supplying you with complex turnkey machined parts “dock-to-stock.”, our unparalleled deep hole machining capabilities help you deliver next-gen solutions…today. Challenge us, we’re up to it!

Our services

  • Deep Hole Drilling

  • Trepanning

  • Honing

  • Pull Boring

  • BTA/STS Drilling

  • Bottle Bores

  • Contour Bores

  • Skiving/Reaming

  • Bore Burnishing

Gun Drilling

Hunting provides industry leading and highly specialized proprietary Gun Drilling Technology with abilities to monitor the drill's path and trajectory producing the deepest holes with the most accurate positional tolerances through lengths up to 32 ft.

  • Holes from 0.55" to 2.0" up to lengths of 32 ft (Holes up to 14.0" available by other methods)

  • Able to drill most known alloys from aluminium to the most advanced high strength materials

  • Drill off-centre holes, angled holes, cross chamber holes, blind holes with flat or spherical bottom configurations

  • Super concentricity in precision tubular products with less than .002" T.I.R. wall variation

Bore Machining

Hunting is the industry leader in deep hole machining. With over 70 years of innovation, our customer designed machines with highly sophisticated proprietary drilling technology puts us in the position of the industry leader in providing the deepest holes and most accurate positional tolerances.

  • Holes from .55" to 15.0" up to lengths of 36 ft.

  • Product unconventional bore configurations

  • Able to Drill through the most advanced alloys

  • On Centre (concentric) or Off Center (eccentric) configurations

  • Angled holes, blind holes, cross chamber holes, balls or flat bottom holes

  • Bottle-bores, stepped bores or contoured bores

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