What tolerances can Sunmy Hardware hold on CNC machined parts?

Critical CNC-milled and turned features can be held to ±0.005 mm, with ±0.01 mm achievable as a standard on precision features. Final achievable tolerance depends on material, feature size and geometry, and is confirmed during the engineering (DFM) review before production.

Which manufacturing processes are performed in-house?

CNC machining and metal stamping are performed in Sunmy-owned facilities. Casting and surface finishing are produced by audited partner plants. All final quality control, CMM dimensional inspection and First Article Inspection reports are executed in-house by Sunmy engineers before shipment.

How is my CAD data and intellectual property protected?

Sunmy signs a Non-Disclosure Agreement with your team by email before any 3D or CAD files are collected, and you communicate directly with the factory, so drawings are not handed off through trading intermediaries.

What quality documents are supplied with shipments?

Material certificates, First Article Inspection (FAI) reports and CMM dimensional reports are available, together with RoHS compliance documentation where required.

Do you support prototypes and low-volume production?

Yes. Sunmy supports rapid prototyping and low-volume manufacturing through CNC machining, 3D printing and urethane casting, then scales the same part into die casting, stamping or injection molding for volume production.

How fast do your engineers respond to a new project?

Engineers respond to drawings and project requirements within 24 hours, including initial manufacturability feedback.

High Performance Custom Copper Heatsink Manufacturer OEM ODM Thermal Solution Supplier

Product Overview

Designed for high-power electronic devices, this copper heatsink maximizes thermal conductivity. Copper is notoriously difficult to machine due to its ductility ("gumminess"), but it offers superior heat dissipation compared to aluminum. This product showcases our ability to handle challenging materials for functional applications.

Manufacturing Process Insight

CNC Milling

We use sharp, polished carbide tools and specific cutting strategies to prevent the soft copper from sticking to the cutter (built-up edge).

Fin Machining

The tall, thin cooling fins are machined with high aspect ratios. We carefully control feed rates to prevent the fins from bending during the cutting process.

Flatness Control

The base contact area is fly-cut to achieve extreme flatness and a mirror-like finish, ensuring maximum thermal transfer efficiency with the CPU or heat source.

Key Features & Benefits

Superior Thermal Conductivity

Copper (approx. 400 W/m·K) transfers heat almost twice as fast as Aluminum.

Complex Geometries

CNC machining allows for custom fin shapes and mounting holes that extrusion cannot achieve.

Surface Protection

Can be treated with anti-oxidation coating or nickel plating to prevent tarnishing over time.

Application

Ideal for lasers, 5G base stations, and high-performance computing (HPC) cooling.

Other products

Custom Titanium Ultrasonic Booster

Custom CNC Turned Tooling Sleeves & Threaded Retaining Plugs

Custom Hollow-Shaft Cycloidal Reducer

Custom 6-Axis Force/Torque Sensor Housings

Get a Fast, Technical Quote & Free DFM Review

Don't let tolerance stack-up delay your product launch. Submit your project details, and our engineering team will evaluate your design for manufacturability before the first cut.

Technical FAQ

Q1 Why choose CNC over extrusion for heatsinks?

CNC allows for prototypes, low volumes, and complex 3D shapes (like pin fins) that extrusion cannot produce.

Q2 Copper is expensive. Can you help reduce costs?

We can suggest hybrid designs (Copper base + Aluminum fins) or optimize the design to reduce machining time.

Q3 How do you prevent copper from oxidizing?

We vacuum pack parts immediately after cleaning and can apply clear passivation, anti-oxidation coatings, or nickel plating.

Q4 How do you prevent thin cooling fins from bending during CNC milling?

We use specialized polished carbide cutters, optimized high-speed tool paths, and tailored feed rates to minimize tool pressure against high-aspect-ratio fins.

Q5 What flatness tolerance can be achieved on the contact base?

Through precision fly-cutting processes, we achieve ultra-flat and mirror-like contact surfaces, maximizing thermal interface contact with heat sources.

Q6 Which thermal applications benefit most from CNC-machined copper heatsinks?

They are ideal for high heat-flux density hardware, such as industrial laser systems, 5G RF power amplifiers, and high-performance computing (HPC) modules.