Deep Hole Drilling Applications

Deep holes exist in a range of applications, across nearly every industry, each one with its own set of strict requirements and unique challenges, from tight tolerances to tough materials to high production goals.

The following examples are typical applications, processes, and tolerances, and although they are not actual part drawings, these are indicative of what is possible on UNISIG deep hole drilling machines with proper machine configuration, tooling, and process knowledge.

Click on each image to view part drawing specifications.

Fuel Injector Bodies

High precision, high volume parts require multiple holes at extreme tolerances, achieved by a 3-spindle gundrilling center with robotic and conveyor automation.

Operations:

3-step gundrilling

Fuel Rails for Diesel Engines

Fuel rails require small straight holes, that won’t fail when under fuel pressure. Gundrilling is capable of achieving holes drilled to these strict tolerances.

Operations:

Gun drilling

Heat Exchanger Tube Sheet

Thousands of accurate holes are achievable quickly and efficiently on a multi-spindle tube sheet drilling machine.

Operations:

BTA solid drilling on multiple spindles
2160 holes per part

Machine:

UNISIG USC-TS50

Aircraft Landing Gear

Drill and contour landing gear actuating cylinders while holding an extreme straightness tolerance in high-strength alloys.

Operations:

BTA Solid Drill
Bottom Contour Forming
Center Pressure Hole Drill

Machine:

UNISIG B500

Fluid Assembly Ends

A series of holes is drilled in a block of steel for hydraulic fracturing equipment. A heavy workpiece and strict tolerances require capable machines and tools.

Operations:

BTA Solid Drilling

Machine:

UNISIG USC-100

Hydraulic Cylinder Inside Bore

Finish an existing bore to mirror-like surface finish requirements for superior hydraulic cylinders.

Operations:

Combination skiving and roller burnishing in one pass, after port is welded to workpiece

Machine:

UNISIG S600

Oilfield Exploration Equipment

Drill holes at extreme depth-to-diameter ratios in long workpieces without sacrificing accuracy in roundness or wall thickness.

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Operations:

Pull Boring with tensioned bar
Roller Burnishing for surface conditioning

Machine:

UNISIG B600

Oilfield Downhole Exploration

Trepan holes at extreme depth-to-diameter ratios in long workpieces without sacrificing accuracy in roundness or wall thickness.

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Operations:

Trepanning from solid
Reusable core remaining

Machine:

UNISIG B630