CNC turning service

Functional & end-use parts . Plastics & Metals . As fast as 1 day

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What is CNC Turning

CNC turning is a subtractive manufacturing process that rotates a metal rod while a cutting tool is held against the stock to remove material and create final parts. At our factory, CNC lathes are also equipped with live tooling that can machine flat features and holes into the workpiece. Outside diameter (OD) and inside diameter (ID) threading is also available.

Turned parts can then be left as-machined, with visible tool marks, or bead blasted, Anodizing, Black oxide.

How does CNC turning works?

5 easy steps for making the CNC turned parts

1. Get the G-code file ready( from the 3D file)

2. Load the material: A blank bar of plastics or metals

3. Use the Chuk holds the workpiece in place while the spindle spins

4. When the spindle is up to speed, a stationary cutting tool is brought into contact with the workpiece to remove material until the desired geometry is achieved.

5. When all machining operations are completed the part will be cut from the stock for further surface finishes.

What metals can be machined by CNC router?

Aluminum

Aluminum is considered to be the most popular and cost-effective metal when it comes to CNC Machining. This is because it has high machinability, lightweight but strong.

Al6061 is an economical grade that offers fantastic workability and machinability. It is seen as a general-purpose grade material.

Stainless Steel

Whilst it does not have the same high machinability as Aluminum, stainless steel still does maintain good machinability. More robust and with more chemical resistance than Aluminum makes, it is also a trendy material in CNC machining services.

SS304 and SS306 grades are the two most commonly used ones.

Alloy Steel

Alloy steel is a low alloy steel that contains manganese, chromium, and molybdenum. It has high fatigue strength toughness, and impact resistance properties, making it an attractive alloy for many applications and industries. This alloy is more cost-effective compared to stainless steel.

Titanium

As the most expensive metal in the CNC metals family. Titanium…

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Metals in CNC Machining

Material Name	Grade	Ultimate tensile strengh(Mpa)	Elongation at break(%)	Hardness(HRB)	Chemical resistance
Aluminum	6061-T6	291-320	12-17	60	High
Aluminum	7075-T6	430-580	3-11	80	Moderate
Aluminum	7050	500-550	11	147	Good
Aluminum	6063	110-300	12	25-95	High
Aluminum	2024	200-540	14-20	70-120	Poor
Stainless Steel	304/304L	480-620	45-60	75=83	Good
Stainless Steel	316/316L	480-620	30-50	75-83	Excellent
Stainless Steel	17-4PH	896-990	7	250-260	Excellent
Mild Steel	1018	190-440	17-27	76	Poor
Mild Steel	1045	620-680	13-18	84	Poor
Alloy Steel	4140	915-1130	13.5-21	275-335HV	Moderate to Poor
Alloy Steel	4340	670-820	17-27	200-245HV	Moderate to Poor
Tool Steel	D2	2100-2500	13-15	58-64	Excellent
Tool Steel	A2	2040-2360	3.5-6.1	57-62	Excellent
Tool Steel	O1	2040-2360	3.5-6.1	57-62	Excellent
Brass	C360	140	23	–	Moderate
Copper	110	220-230	15-50	40 HRF	Moderate to poor
Copper	101	310-380	6-25	27 HV	–

Plastics In CNC Machining

Material	Density(g/cm^3)	Tensile Strength ( Mpa)	Flexural strength (Mpa)	Wear Resistance	Elongation at break (%)	Heat Resistance (0.45Mpa, °C）	Cost
ABS	1.04	37	67	Poor	8	80	$
PC	1.2	75	–	Poor	75	110	$$
Nylon6/66	1.15	80	100	Excellent	50	90	&&&
Nylon6/66+GF	1.36	185	270	Excellent	3	205	$$$$
POM ( Derlin/Acetal)	1.39	67	–	Good	28	-50/110	$$
PMMA(Acrylic)	1.19	72	–	Poor	8	75	$
PP	0.9	36	–	Good	9	-5/85	$
PE-UHMW/HDPE	0.93	20	27	Poor	50	-140/80	$
PVC	1.36	50	80	Poor	29	-15/70	$$
PTFE	2.16	26	–	Good	300	-150/250	$$$$
PEI	1.27	110	170	Good	30	215	$$$
PEEK	1.32	115	170	Excellent	16	250	$$$$

How to select the right CNC plastics?

ABS is one of the most common thermoplastic materials offering good mechanical properties, excellent impact strength, high heat resistance and good machinability.

Polycarbonate is a thermoplastic with high toughness, good machinability and excellent impact strength (better than ABS). It can be colored, but typically it is optically transparent, making it ideal for a wide range of applications, including fluidic devices or automotive glazing.

POM is commonly known with the commercial name Delrin, and it is an engineering thermoplastic with the highest machinability among plastics.

POM (Delrin) is often the best choice when CNC machining plastic parts that require high precision, high stiffness, low friction, excellent dimensional stability at elevated temperatures, and very low water absorption.

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CNC Turning Design Guide

Wall Thickness

Metals: 0.5mm Minimum, 0.8mm recommended

Plastics: 1.0mm Minimum, 1.2mm recommended

Minimum Hole Diameter

0.5 mm

Minimum feature size

Min. 0.5mm, 2mm recommended

Minimum Font Size

6pt

Internal edges

0.25 mm

Minimum Threads

M2 Minimum, M6 recommended

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Available surface finishes for CNC Turning

As machined

~125 RA µin (3.2 RA µm). Minor tool marks will be visible on the part.

Anodizing

It helps to resist corrosion, increase surface hardness, improve resistance to wear, and dissipate heat. Available in a variety of colors. Type I II, Type III

Painting & color matching

We can match the standard Pantone color, paint it into glossy, matte finish, and more options.

Blasting & polish

Bead blasting & Electropolishing add a uniform smooth surface on a machined part. Removing all the tool maks.

Black oxide

Black oxide is a conversion coating used to improve corrosion resistance and minimize light reflection.

Brushing

It helps to resist corrosion, increase surface hardness, improve resistance to wear, and dissipate heat. Available in a variety of colors. Type II, Type III

Vapor polishing

This is a specialized treatment for achieving optical clarity on polycarbonate (PC) plastic. This method is ideal for achieving an extremely clear surface on complex geometries or hard to reach areas.