Get high-precision, functional components delivered straight from the machine tool. We offer three standardized tiers of native as-machined finishes (Standard, Medium, and Fine) to optimize your budget, mechanical tolerances, and lead times without secondary processing costs.
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AS9100D & ISO 9001:2015 Certified Production 100% Dimensional Tolerance Retention Zero Added Post-Processing Days |
Technical Specifications: Standard vs. Medium vs. Fine
We commit to clear, measurable thresholds for our native machine finishes. Use this comparison matrix to select the precise surface roughness average (Ra) your application requires.
- Standard Finish: Ra 3.2 μm (126 μin)
- Medium Finish: Ra 1.6 μm (63 μin)
- Fine Finish: Ra 0.8 μm (32 μin)
| Metric / Attribute | Standard Finish | Medium Finish | Fine Finish |
| Surface Roughness | Ra 3.2 μm (126 μin) | Ra 1.6 μm (63 μin) | Ra 0.8 μm (32 μin) |
| Visual Appearance | Distinct, visible milling step-overs or turning paths. | Lightly visible, uniform tool paths with faint lines. | Highly refined, minimal visible tool marks; semi-reflective. |
| Tactile Feel | Noticeable micro-texture following the tool directional lay. | Smooth to the touch with negligible ridges. | Extremely smooth, uniform, semi-polished tactile profile. |
| Primary Application | Structural brackets, jigs, internal fixtures, weldments. | Mechanical housings, mating faces, precision enclosures. | High-friction dynamic fits, tight fluid or vacuum seals. |
| Cost & Lead Time | Base pricing; fastest turnaround tier. | Low impact; minor cycle time adjustment. | Premium cycle time; requires specialized tooling. |
Material-Specific Visual & Functional Behavior
An as-machined finish depends heavily on the mechanical properties of the substrate being cut. Here is how our three processing tiers translate across different materials:
Aluminum & Steels (such as 6061-T6, SS304, 4140 Alloy Steel)
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Standard (Ra 3.2 μm): Yields bright, highly reflective parts with distinct machining paths. Excellent for functional prototyping and raw structural configurations where aesthetics are secondary to cost-efficiency.
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Medium & Fine (Ra 1.6 to 0.8 μm): Achieved using optimized spindle speeds and fine-feed finishing passes. Essential for defense and aerospace components requiring pristine flat faces to maintain structural integrity under load.
Engineering Plastics (such as POM-Delrin, PEEK, Nylon)
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Standard (Ra 3.2 μm): Features a clean, matte appearance. Tool paths are visible but present minimal tactile friction due to the material's elasticity.
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Fine (Ra 0.8 μm): Yields an incredibly smooth, low-friction, semi-glossy surface. Crucial for medical manifolds or fluidic components where internal passages must prevent turbulent flow and material accumulation.
Understanding the Physics: Milled vs. Turned Finishes
The geometry of the machine tool dictates the lay (the direction of the dominant surface pattern) on your parts.
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Milled As-Machined Surfaces: Produced by a rotating multi-point cutter passing across a fixed material block. This creates a multi-directional, cross-hatched, or circular tool path lay.
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Turned As-Machined Surfaces: Produced by spinning the raw material stock against a fixed, single-point cutting tool. This yields a continuous, linear helical spiral along the outer diameter, naturally achieving lower roughness values (Ra 1.6 μm or better) more efficiently than milling.
Design for Manufacturability (DFM) Tips for Engineers
To maximize the quality of your as-machined surfaces while controlling production costs, implement these parameters during the CAD modeling stage:
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Specify the Lay for Sealing Surfaces: If your part requires a face to seal against a liquid or vacuum gasket, explicitly state the allowed direction of tool paths on your engineering print. Intersecting tool lines can form microscopic leak paths.
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Incorporate Internal Corner Radii: Avoid designing sharp 90-degree internal vertical walls. Implementing a generous corner radius allows our end mills to glide smoothly through direction changes without pausing, preventing tool chatter and localized tool spikes.
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Tighter Tolerances Inherently Refine Finishes: Requesting a dimensional tolerance of ±0.02 mm or tighter automatically requires our CNC programmers to utilize fast-spindle finishing tools and slow feed rates. This configuration naturally results in a Medium (Ra 1.6 μm) or Fine (Ra 0.8 μm) finish without updating your line-item finish request.
Frequently Asked Questions
Do your as-machined finishes include a deburring process?
Yes. Every component manufactured by Clarwe undergoes manual or mechanical edge-breaking and deburring to eliminate loose micro-burrs and sharp corners. Critical dimensions are audited post-deburring to guarantee total print compliance.
Will an as-machined finish show superficial cosmetic variations?
Yes. Because an as-machined finish is the native state of the raw metal or plastic, minor mill scale, material discoloration variations, and faint handling lines can occur. If your assembly demands a uniform cosmetic appearance, consider pairing your parts with our Bead Blasting Services or Anodizing Solutions.
How does a fine finish (Ra 0.8 μm) alter project cost structures?
Achieving an Ra 0.8 μm finish requires specialized carbide tooling run at lower feed speeds to prevent tooling deflection. While this step increases machine cycle times and piece-part costs, it eliminates the need for manual polishing or secondary grinding operations.
Ready to Optimize Your Part Finish?
Upload your 3D CAD models (.STEP, .STP, .IGS) directly to our platform to receive comprehensive pricing and DFM feedback on your selected as-machined configuration.