Custom Online CNC Milling Services
Providing high-precision custom CNC milling services, perfectly suited for prototype development and mass production needs. Achieving tolerances as tight as 0.008 mm to meet rigorous engineering standards. Fast turnaround with parts delivered in as little as 24 hours. Get your custom CNC milling quote today!
Why Choose GSG-Tech
ISO-Certified
Our ISO 9001 and ISO 13485:2016-certified CNC machining process ensures dimensional accuracy, surface integrity, and consistent performance across prototypes and production runs.
98% On Time Delivery
With advanced CNC equipment, optimized scheduling, and an integrated manufacturing network, we deliver parts with industry-leading speed.
15+ Year Experience
Our experience enables us to anticipate challenges early, optimize production processes, and consistently deliver reliable, high-precision parts.
Engineering Support
Our experienced engineering team works closely with you from design to delivery.
Online CNC Milling Services for Custom Parts
From standard 3-axis machining to complex 5-axis applications, GSG-Tech's CNC milling services bring your designs to life with high precision, excellent surface quality, and reliable manufacturing expertise.
Efficient & Direct Custom CNC Milling Solutions
Prototyping
Rapid Prototyping
Leveraging our rapid CNC milling services with speed as our core advantage, we focus on the high-quality production of prototypes and tooling. We support you through efficient design validation and accelerated project timelines.
Production
Low-Volume & Mass Production
Whether you require small-batch pilot runs or large-scale mass production, we can meet your needs with precision. By adhering to strict tolerance standards and comprehensive production capabilities, we ensure high-quality delivery for all batch sizes.
Tolerances for CNC Milling
| General Tolerances | +-0.25mm |
| Precision Tolerances | GSG-Tech can manufacture and inspect to tight tolerances, including sub +/- 0.003" tolerances, per your drawing specifications and GD&T callouts. |
| Min Wall Thickness | 0.15mm |
| Minimum micropore | φ0.1mm |
| Maximum Part Size | CNC Milling: 4000×1500×600 mm CNC Turning: 200×500 mm |
| Minimum Part Size | CNC Milling: 5×5 ×5 mm CNC Turning: 2×2 mm |
| Production Volume | Prototyping: 1-100 pcs Low volume: 101-10,000 pcs High volume: Above 10,001 pcs |
| Lead Time | 5 business days for most projects. Simple parts can be made in as little as one day. |
CNC Milling Design Guidelines
To achieve optimal manufacturability, cost efficiency, and machining accuracy, the following design recommendations can help improve CNC milling performance at GSG-Tech.
| Feature | Recommended Design Guidelines |
|---|---|
| Internal Radii | Internal corner radii should ideally be at least one-third of the cavity depth. Using larger radii when possible improves tool access, reduces machining stress, and enhances surface quality. |
| Threads & Tapped Holes | For threaded features Ø1.5–5 mm, recommended thread depth is about 3× the diameter. For threads ≥ Ø5 mm, a depth of 4–6× the diameter is recommended. Custom thread sizes and specifications can be produced according to project requirements. |
| Minimum Wall Thickness | Recommended minimum wall thickness is 0.8 mm for metal parts and 1.5 mm for plastic parts. Designing thicker walls where possible helps maintain part strength and dimensional stability. |
| Engraved Text | For CNC engraved text, the recommended minimum line width is 0.5 mm with a minimum depth of 0.1 mm. Text and markings can be created through CNC engraving or laser engraving depending on design requirements. |
| Holes | The recommended minimum hole diameter is 1 mm. For best machining performance, the hole depth should generally not exceed 4× the hole diameter. |
| Undercuts | Undercuts such as square, full-radius, or dovetail profiles should follow standard tooling sizes and be positioned away from internal corners to allow proper tool access. |
| Internal Corner Fillets | Sharp internal corners will naturally form radii due to round cutting tools. Fillets should typically be 0.020″–0.050″ larger than the standard tool radius to improve machining efficiency. |
CNC Milling Materials
We offer over 30 CNC milling materials to meet your project's functional and aesthetic requirements. From aluminum, steel, and brass to advanced engineering plastics, we provide high-quality materials for your custom CNC milled parts.
Metals
Aluminum
Lightweight, corrosion-resistant, and featuring a high strength-to-weight ratio, aluminum is ideal for aerospace, automotive, and construction industries. It is also highly machinable.
Color:
Silver
Grades:Aluminum 5052, 5083, 6061
Lead Time:Approx. 5 business days
CNC Milling Surface Finishes
We offer over 10 surface finishing options for your CNC milled prototypes and production parts. Our extensive range allows you to select the right finish based on your milled part's specific requirements and application.
As-Machined
Provides a cost-effective option with visible tool marks, as the surface is left directly from the CNC machine.
Anodizing
Improves corrosion and wear resistance while allowing for color dyeing, ideal for aluminum components.
Polishing
Achieves a high-gloss finish, reducing surface roughness and enhancing the aesthetic appeal of the metal.
Sandblasting
Uses pressurized sand or other media to clean and treat the surface, creating a uniform matte finish.
Brushed Finish
Creates a unidirectional fine texture, reducing the visibility of marks and scratches on the surface.
Powder Coating
Provides a thick, durable, and wear-resistant coating with excellent color and texture options for various surfaces.
Electroplating
Bonds a thin metal layer to the part, enhancing wear resistance, corrosion resistance, and surface conductivity.
Black Oxide
A conversion coating for ferrous metals that improves corrosion resistance and minimizes light reflection.
Electropolishing
An electrochemical process that smooths and brightens the surface while significantly improving corrosion resistance.
Alodine
A chromate conversion coating for aluminum that provides corrosion protection and improves paint adhesion.
CNC Milling Services for End-Use Parts
Get high-quality machined parts faster with our expanded automated CNC milling—parts ready in as fast as 5 days.