CNC Surface Finish Guide
CNC Surface Finish Guide for Custom Machined Parts
Compare common CNC surface finishing options by material fit, visual result, dimensional impact, roughness target, 検査方法, and RFQ information needed before production planning.
Finish selection before quotation
What This Guide Helps You Decide
Surface finish affects how a CNC machined part looks, fits, resists corrosion, handles wear, conducts electricity, insulates, seals, and passes inspection. JADE-CNC reviews finish requirements together with material, 幾何学, 加工痕, マスキング領域, 許容誤差への影響, and cosmetic surfaces.
This guide is a practical reference for RFQ preparation. Actual finish capability is confirmed according to drawing requirements, 材質グレード, 部品の形状, coating process, 検査範囲, and project quantity.
RFQ review note
For faster review, include finish name, 色, 目に見える顔, マスキング領域, roughness target, coating thickness if required, 検査方法, and any functional surfaces that must remain controlled after finishing.
Surface function
Start With the Function of the Surface
Define matte, glossy, brushed, polished, black, natural, or color-matched surfaces and identify visible cosmetic faces.
Confirm whether the part faces humidity, salt, outdoor exposure, chemicals, or cleaning fluids.
Mark sliding surfaces, 嵌合面, threaded areas, and features where coating buildup may affect fit.
Clarify conductive, insulating, grounding, or masking requirements before anodizing, コーティング, or plating.
Review coating thickness, マスキング, edge condition, hole fit, and tolerance zones before final finish approval.
Specify whether roughness check, coating thickness record, visual approval, or dimensional report is required.
Common finishing options
Surface Finishing Options JADE-CNC Commonly Reviews
| Finish Option | Typical Use | Materials Often Reviewed | Key RFQ Details |
|---|---|---|---|
| 陽極酸化処理 | Color, 耐食性, and improved surface durability for aluminum parts. | アルミニウム 6061, 7075, 2024, 6082 | Color, Type II or hardcoat, マスキング領域, 目に見える顔, thickness if controlled. |
| ビーズブラスト | Uniform matte appearance and reduced machining marks before anodizing or cosmetic review. | アルミニウム, ステンレス鋼, 真鍮 | 化粧面, protected dimensions, acceptable surface texture, before/after finish condition. |
| Black Oxide | Dark surface appearance and mild corrosion protection for steel components. | Carbon steel, alloy steel, 工具鋼 | Required appearance, post-treatment oiling, threaded areas, 合わせ面. |
| 不動態化 | Cleaning and corrosion-resistance support for stainless steel machined parts. | ステンレス鋼 304, 316, 17-4PH | 材質グレード, standard if specified, cleanliness needs, documentation requirement. |
| 研磨 / Brushing | Directional or reflective appearance for visible metal surfaces. | ステンレス鋼, アルミニウム, 真鍮 | Grain direction, visible side, roughness target, edge protection, sample approval if needed. |
| 絵画 / 粉体塗装 | Color, 外観, insulation, and protective coating for housings or panels. | アルミニウム, 鋼鉄, selected assemblies | Color code, コーティングの厚さ, マスキング, threaded holes, adhesion or cosmetic requirement. |
Dimensional and inspection planning
How JADE-CNC Reviews Finish Impact
描画レビュー
Check finish symbols, notes, 限界寸法, GD&T, 目に見える顔, スレッド, 穴, and mating surfaces.
Material Match
Confirm whether the requested finish is suitable for aluminum, ステンレス鋼, 銅, 真鍮, 鋼鉄, or engineering plastic.
Masking Plan
Identify areas that must stay conductive, uncoated, threaded, dimensionally controlled, or cosmetically protected.
検査範囲
Plan visual checks, roughness review, coating thickness record, 三次元測定機レポート, or finish approval reference when required.
RFQ checklist
Information to Share With Your Drawings
陽極酸化処理, ハードコート陽極酸化処理, 黒色酸化物, 不動態化, 研磨, ビーズブラスト, 絵画, メッキ, or powder coating.
Natural, black, clear, matte, gloss, brushed direction, 化粧品の顔, and sample approval expectation.
Threads, 穴, 穴, sealing faces, electrical contact zones, 嵌合面, and surfaces that need masking.
コーティングの厚さ, Raターゲット, pre-finish dimensions, after-finish dimensions, and acceptance tolerance.
Visual inspection, dimensional report, 三次元測定機レポート, coating check, roughness check, CoC, or customer format.
Outdoor exposure, salt, 熱, 着る, chemical contact, cleaning fluid, insulation, 導電率, or assembly condition.
Need a Finish Review Before Quotation?
Send drawings, 材質グレード, 仕上げ要件, cosmetic expectations, 検査の必要性. JADE-CNC will review manufacturability before machining and finishing planning.
CNC Surface Finishing FAQ
Common CNC surface finishes include anodizing, ハードコート陽極酸化処理, ビーズブラスト, 研磨, ブラッシング, 不動態化, 黒色酸化物, メッキ, 絵画, 粉体塗装, レーザーマーキング, and tumbling.
Start with the part function. Appearance, 耐食性, 耐摩耗性, electrical conductivity, insulation, 封印, クリーニング, and assembly fit can all affect the finish choice.
はい. Anodizing and hardcoat anodizing can add coating thickness and may affect holes, スレッド, 嵌合面, and tight tolerance areas. Controlled dimensions should be marked clearly on the drawing.
Masking should be considered for threads, 穴, sealing faces, electrical contact areas, bearing surfaces, 嵌合面, and any feature that must remain uncoated or dimensionally controlled.
はい. Passivation is commonly used for stainless steel parts to support corrosion resistance and cleanliness. Material grade and documentation requirements should be confirmed when needed.
Some plastic parts can be polished, bead blasted, vapor polished, painted, or laser marked depending on the material. The finish method should match the plastic type and appearance requirement.
Bead blasting creates a more uniform matte surface, while polishing produces a smoother or more reflective appearance. The choice depends on cosmetic expectation, 材料, and visible surface requirements.
Coating thickness can affect hole fit, thread function, シール面, mating dimensions, and assembly clearance. Drawings should identify areas where thickness must be controlled or avoided.
Important checks may include visual appearance, color consistency, 表面粗さ, コーティングの厚さ, masking result, critical dimensions after finishing, および顧客が必要とする書類.
CADファイルを送信する, 2D図, 材質グレード, finish name, color or appearance target, マスキング領域, roughness target, coating thickness requirement, 化粧品の顔, and inspection record needs.