Precision CNC Milling Services
Tight Tolerance 3-Axis & 4-Axis Contract Machining
Greno Industries provides high-precision 3-axis and 4-axis CNC milling services for manufacturers in mission-critical industries. Operating from our state-of-the-art facility, we specialize in heavy material removal and tight-tolerance finishing for difficult-to-machine metals.
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Tolerances: Routinely holding tight tolerances down to ±0.0005 inches.
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Production: Prototype components through short-run production batches.
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Compliance: ITAR Registered, AS9100 Certified, and ISO 9001:2015 Certified.
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Industries Served: Medical Devices • Aerospace • Defense & Military • Power Generation • Maritime • Heavy Lifting • Oil & Gas
Material & Capability Matrix
Choosing the right milling configuration optimizes machining cycle times, tool life, and manufacturing costs.
| Material Group | 3-Axis Milling Capabilities | 4-Axis Milling Capabilities |
|---|---|---|
| Carbon Steel | Ideal for prismatic parts, pockets, slots, and planar surfaces. Faster setup for brackets, housings, and base plates. | Machines multiple sides without refixturing. Best for shafts, keyways, flanges, and radial features. |
| Stainless Steel (300/400 Series, 17-4 PH) | Controlled, simplified toolpaths manage heat generation. Excellent for enclosures, plates, and structural components. | Reduces setup changes to prevent work-hardening. Better tool access reduces chatter on tall walls; ideal for manifolds. |
| Inconel (718 / 625) | Best reserved for simple geometries with minimal side-access requirements. Requires conservative feeds and speeds. | Allows continuous tool engagement around curved surfaces to distribute heat evenly. Perfect for turbine rings. |
| Titanium (Grade 2 / Ti-6Al-4V) | Relies on highly rigid setups to counteract material elasticity and eliminate harmonic chatter. Ensures flat datum surfaces. | Maximizes feature-to-feature accuracy for thin-walled components and medical implants by reducing tool deflection. |
CNC Milling Isn’t All That We Do
We don’t just mill parts—we deliver completed assemblies. By pairing our CNC milling capabilities with our specialized in-house secondary services, we streamline your procurement:
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Large Diameter Turning & Gun Drilling Services
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Production Welding (MIG, TIG, and Stick Services)
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Surface Treatment, Assembly, & Kitting
Frequently Asked Questions
What is the primary difference between 3-axis and 4-axis milling?
In 3-axis milling, the tool moves along three linear axes (X, Y, and Z) while the workpiece stays stationary. 4-axis milling adds a rotary axis (A-axis), allowing the workpiece to rotate automatically. This lets us machine multiple sides or cut intricate radial features without manual intervention.
When should I choose 4-axis machining over 3-axis?
Opt for 4-axis machining if your part requires features on multiple faces, contains radial geometries (like splines, gears, or rotational bolt patterns), or requires continuous curved toolpaths. It also eliminates manual repositioning, which significantly improves dimensional tolerance stack-ups.
What quality standards and certifications does Greno hold?
Greno Industries is an ITAR-registered machine shop (CAGE CODE: 62654) and complies with all DDTC data governance regulations. We provide full material traceability and secure data handling required by tier-1 aerospace and defense OEMs.
Expect More From Your Machine Shop
Are you ready to work with a machine shop that does more? Submit your CAD files, STEP models, or technical drawings today. Our engineering team provides fast, comprehensive RFQ turnarounds for complex components.