Custom CNC Machining Services On-Demand | Precision Parts & Prototypes

On-demand Custom CNC Machining Services

On-demand Custom CNC Machining Services, computer numerical control machining, is a widely used manufacturing process that uses automated, high-speed cutting tools to form designs from metal or plastic stock. Standard CNC machines include 3-axis, 4-axis, and 5-axis milling machines, lathes, and routers. Machines may vary in how CNC parts are cut—the workpiece may remain in place while the tool moves, the tool may remain in place while the workpiece is rotated and moved, or both the cutting tool and workpiece may move together.

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Application

Skilled machinists operate a CNC machine by programming tool paths based on the geometry of the final machined parts. The part geometry information is provided by a CAD (computer-aided design) model. CNC machines can cut almost any metal alloy and rigid plastic with high precision and repeatability, making custom machined parts suitable for nearly every industry, including aerospace, medical, robotics, electronics, and industrial. BOMIS provides CNC services and offers custom CNC quotes on over 40 materials.

Advantages of CNC Machining

The subtractive process of CNC machining provides multiple benefits for both prototyping and production parts.

Precision and repeatability
Tight tolerances
Production-grade materials
Quick-turn parts within 1 day
Lower piece-part price at higher quantities
Robust post-processing to improve cosmetics and material properties

CNC Machining Applications

CNC machining is widely used throughout the aerospace, medical, automotive industries for its ability to rapidly manufacture precise parts in production-grade materials. Typical CNC parts, include:

Housings and enclosures
Brackets
Fixtures for manufacturing
Gears and bearings
Internal mechanical components
Medical instrumentation

Why would I choose CNC Machining?

CNC machining remains a process whose characteristics are perfect for the manufacture of series, small series, or metal parts.

It can also in some specific cases, appear more interesting than 3D printing for the realization of functional or aesthetic prototypes, or mockups. In particular, if the part is relatively large and it is not possible to do this in a 3D printer.

CNC machining is much more developed than 3D printing and therefore it is easier to find manufacturers around the world.

product specifications

Part size	Machined parts are limited in size by the machine envelope. 3-axis machines typically have a larger build size than multi-axis machines.
Feature alignment	For 3-axis machining, it costs more to add features to multiple faces. It can therefore help to design parts with holes and and other features aligned on a single face.
Fillets	Internal fillets should be as large as possible to allow a large-diameter tool to be used. The radius of the internal fillet should be greater than 1/3 the cavity depth to prevent tool damage.
Wall thickness	Metal parts typically require a minimum wall thickness of 0.8 mm, while plastic parts require 1.5 mm. Thinner walls are vulnerable to vibration and deformation.
Cavity depth	To minimize chatter, tool deflection, and other issues, the depth of machined cavities should be no more than 4x the width.
Holes and threads	Hole and thread diameters should correspond to standard drill bits and threading tools. Hole depth should generally be no more than 10x the diameter.
Undercuts	T-slot undercuts can be around 3–40 mm wide. Dovetail undercuts work best at a standard angle of 45 or 60 degrees.

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