Gundrilling Services: Deep Hole Drilling Solutions

How CIC Specializes in Gundrilling Services

At Custom Industrials Company (CIC), we specialize in gundrilling services that produce precision deep holes with exceptional straightness and surface finish. Our gundrilling capabilities handle hole diameters up to 1″ OD with depths to 40″, achieving depth-to-diameter ratios far beyond conventional drilling. Gundrilling delivers superior results for applications requiring deep, straight holes with tight tolerances and excellent internal surface finish.

What Is Gundrilling?

Gundrilling is a specialized deep-hole drilling process originally developed for producing rifle barrels and now used across many industries for precision deep holes. The process uses a single-flute, self-piloting drill with high-pressure coolant flowing through the tool to evacuate chips and maintain cutting efficiency at extreme depths. Unlike conventional drilling which becomes inaccurate at depth-to-diameter ratios beyond 5:1, gundrilling maintains exceptional straightness and surface finish at ratios of 20:1, 50:1, or even higher.

Gundrilling Capabilities

Our precision gundrilling services feature:

Hole diameters up to 1″ OD
Hole depths up to 40″
Extreme depth-to-diameter ratios
Exceptional hole straightness
Superior internal surface finish
Tight diameter tolerances
Concentricity control
Various material capabilities

Industries Served with Gundrilling

CIC’s gundrilling services deliver precision deep holes for:

Oil and Gas Industry
Hydraulic Equipment Manufacturing
Aerospace and Defense
Mold and Die Making
Medical Device Manufacturing
Firearms and Sporting Goods
Industrial Machinery
Automotive Components

Gundrilling End Applications

Our gundrilling services excel in applications including:

Hydraulic cylinder barrels
Hydraulic valve bodies
Mold cooling channels
Spindle bores
Crankshaft oil passages
Firearm barrels
Fuel injector bodies
Medical instrument channels

Gundrilling Materials

We gundrill a range of materials including carbon steel, alloy steel, stainless steel, aluminum, brass, and other metals. Material hardness, machinability, and application requirements influence drilling parameters and tooling selection for optimal results.

Gundrilling FAQ

What makes gundrilling different from conventional drilling?

Gundrilling uses a specialized self-piloting tool with high-pressure coolant through the tool, enabling straight, accurate holes at depth-to-diameter ratios far beyond conventional drilling's 5:1 limit. Gundrilling achieves ratios of 50:1 or higher with excellent straightness and surface finish.

What tolerances can gundrilling achieve?

Gundrilling achieves diameter tolerances typically in the range of ±0.001" to ±0.003" with straightness maintained over extreme depths. Surface finishes of 32 RMS or better are commonly achieved.

What are the maximum dimensions for gundrilling?

Our gundrilling capability handles diameters up to 1" OD and depths up to 40". This enables deep holes with depth-to-diameter ratios exceeding 40:1 while maintaining precision and surface finish.

How does gundrilling achieve such straight holes?

The gundrill's self-piloting design and continuous chip evacuation through high-pressure coolant maintain tool alignment throughout the drilling process. The tool follows its pilot accurately even at extreme depths, producing straight holes conventional methods cannot match.

Quality Assurance for Gundrilling

Every CIC gundrilled component undergoes:

Diameter verification with precision gauging
Straightness measurement
Surface finish inspection
Depth verification
Material certification review
Complete documentation and traceability

Contact our technical team today at 314-567-5847, or email us at rfq@cic-cic.solutions for expert guidance on your gundrilling requirements.

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