CAPABILITIES
CNC Milling Service
Our 3-axis & 5-axis CNC milling center is dedicated to creating complex geometries and features
- Tolerances down to ±0.0002″ (0.005mm)
- Parts as Fast as 1 days
- Aluminium, Steel, Copper, Polymers & More
- 3 & 5-Axis Milling
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Why Choose Our CNC Milling Service
Pro lean is dedicated to precise drilling, boring, reaming, milling planes, bevels, grooves, surfaces (cams), and tapping in various workpieces with various structures and shapes.
Using Multiaxis -CNC milling machines, we produce high-quality parts based on specified designs for commercial and industrial applications. We are eager to work with you to deliver precise CNC machined parts for your project.
How to Order parts?
Get a free quote from a real Engineer, Once we receive your design, Our engineer will review it and send you a quotation as fast as one hour.
Get One Hour Quote
Upload your design or send an email directly to our engineer and get your quotes within as fast as one hour
Start Production
Your parts will get made once your orders confirmed, besides, your will get real-time updated of the production status from our order tracking system
Receive Your Custom Part
After all parts pass qc inspection, they will be well packed from any transportation accidents. Then, your custom parts are delivered straight to your doorstep
CNC Machining Materials Options
Metals
Aluminum
Aluminum is a superior metal in terms of strength-to-weight ratio. It offers High Machinability, ductility, and thermal & electrical conductivity. Parts with aluminium also become highly resistant to corrosion.Alloys
Aluminum (MIC6)Aluminum (2024)
Aluminum (5052)
Aluminum (5083)
Aluminum (6082)
Aluminum (6061-T6)
Aluminum (6063)
Aluminum (7075-T6)
Brass
Golden shiny color, low friction, excellent Machinability, and high electrical & thermal conductivity. Brass can be easily machined and the best choice for low-friction applications.Alloys
Brass (360)
Copper
It offers good strength, hardness, and excellent corrosion resistance with superior heat and thermal conductivity. It also has a very appealing aesthetic.Alloys
Copper 101Copper 110
Titanium
40% more strength-to-weight ratio than steel, Excellent corrosion resistance, low thermal expansion, and biologically inert. These properties make it perfect for automotive, aerospace, and medical applications.Alloys
Grade 1 TitaniumGrade 2 Titanium
Grade 5 Titanium（TC4, Ti6Al4v)
Alloy Steel
High mechanical strength, toughness, resistance to wear and fatigue, and sturdiness. In addition to carbon, other alloying elements can be added depending on the needed mechanical and physical qualities.Alloys
Alloy Steel 4130Alloy Steel 4340
Steel (4140 Alloy)
Steel (1018 Low Carbon)
Tool Steel (A2)
m2
d2
20GR
Zinc-Galvanized Low-Carbon Steel
Carbon Steel (1045)
Stainless Steel
High mechanical strength, Thermal, Wear, and Corrosion resistance. Stainless steel is low-cost and can be machined easily. Parts made from Stainless steel are durable and do not lose that strength over time.Alloys
Stainless Steel 201Stainless Steel 301
Stainless Steel 303
Stainless Steel (304L)
Stainless Steel (316L)
Stainless Steel (410)
Stainless Steel (420)
Stainless Steel (440C)
Stainless Steel (17-4 PH)
Cast iron
It offers three to five time’s higher compression strength than steel. Low notch sensitivity, Good Resistance to deformation, excellent anti-vibration, and consistent mechanical propertiesPlastics
- ABS
- Acrylic
- Delrin
- Garolite G-10
- FR4
- Polyethylene (PE)
- Nylon
- PEEK
- Polycarbonate（PC）
- Polypropylene(PP)
- PPSU（Polyphenylene sulfone resins）
- PPS (Polyphenylene)
- PTFE (Teflon）
- polyetherimide (PEI)
- PMMA (Acrylic)
- PVC
ABS
Excellent strength, extraordinary impact, and abrasion resistance with chemical inertness. ABS can be machined easily and is very easy to paint and glue.
Acrylic
Acrylic is a lightweight, rigid thermoplastic with optical clarity. It is one of the superior alternatives to glass, offering excellent weather and chemical stability.
Delrin
High tensile strength, excellent Machinability, Stiffness, wear resistance, creep resistance, and low friction. Overall, Delrin is the ideal replacement for metal.Subtypes
Delrin (30% Glass-Filled)
Garolite G-10
High strength to weigh ratio, fire resistive, low thermal expansion coefficient, and water absorption coefficient are entirely free from corrosion risk. Garolite is perfect for insulating parts and electric circuit boards.
FR4
FR-4 is a manufacturing material with strength almost equal to steel and lightweight. It is a perfect fit for making parts for the electrical marine industry since it is flame retardant, has a negligible water absorption coefficient, and is machinable.
Polyethylene (PE)
Polyethylene is known for its malleable properties. It offers a high strength-to-weight ratio, impact strength, chemical inertness, temperature, and weather resistance.Subtypes
UHMW-PE HDPE
Nylon
Mechanical properties include high resilience, tensile strength, and fatigue resistance. Nylon is a flexible manufacturing material that is highly resistant to abrasion, heat, chemicals, water, and oils.Subtypes
Nylon (30% Glass-Filled)
PEEK
A versatile engineering material with high mechanical strength. It provides excellent thermal and chemical resistance. Parts from PEEKS are durable and can be operated at an extensive range of temperatures (up to 2600).Subtypes
PEEK (30% Glass-Filled)
Polycarbonate（PC）
Exceptional mechanical properties, including impact strength, toughness, Stiffness, and creep resistance. Because of its transparent nature, Polycarbonate (PC) is a lightweight alternative to glass.
Polypropylene(PP)
A low-cost material with good Stiffness, impact resistance, and chemical stability. PP also offers excellent wear resistance and elasticity.
PPSU（Polyphenylene sulfone resins）
PPSU is used in various sectors because of its lightweight, high toughness, great impact resistance, high heat resistance, chemical stability, transparent color, and wide operating temperature range
PPS (Polyphenylene)
The unique combination of Physical, mechanical, and chemical properties. Excellent strength, rigidity, fatigue endurance, creep resistance, chemical inertness, and a wide range of working temperatures for the fabricated parts make it a perfect choice for electrical applications with high operating temperatures.
PTFE (Teflon）
High chemical inertness, thermal stability, electrical insulation, and corrosion resistance. Teflon is a low-friction substance that is perfect for making non-sticky and sliding parts for various industries.
polyetherimide (PEI)
Semi-transparent, high strength, rigidity, thermal stability, chemical inertness, and dimensional stability. Parts made from PEI can work for an extended period without stress cracking.
PMMA (Acrylic)
Transparent, lightweight, strong mechanical strength, hardness, thermal stability, and chemical inertness. Transparent nature makes it an excellent alternative to glass.
PVC
Excellent Stiffness, flame resistance, weather resistance, dimensional stability, and chemical inertness. PVC is appropriate for pipelines, medical devices, outdoor appliances, and electrical insulation.CNC Machining Material Guide
Finishing Options
As the machined or deburring
The machined or deburring finish is the standard finish where unwanted attach chips are removed with deburring tools, and sharp edges are chamfered to smooth the surface (3.2 μm).
Bead Blasted
Bead blasting produces a matte texture, removing all the marks of machining tools. It applies to ABS, Aluminum, Brass, Stainless Steel, and Steel parts.
Anodizing
Anodizing involves adding an aluminum oxide coating to aluminum and its alloys. The layers, which come in various colors, increase strength and shield the surface from corrosion.
Powder coating
Powder coating is the electrostatically applying of dry powder to the surface. It produces a thin layer providing excellent resistance to wear, corrosion, and abrasion.
Polishing
Physical rubbing of a metal surface to create a shiny surface is called a polishing surface finish. It increases the reflectivity and does not affect the dimensional stability of parts.
Brushing
Brushing is achieved by applying an abrasive brush to the metal surface, which produces a unidirectional satin finish. And it is not recommended for highly corrosive materials.
Smooth machining
Smooth machining is done by controlling the machining process, such as feed rate & cutting speed. It minimizes the tool marks and risk of corrosion.
Black-Oxide
Black oxide finish reduces surface reflectivity and offers mild corrosion protection. It involves adding a thin layer of magnetite to the surface.
Electro-less Nickel Plating
A thin layer of Nickel is created on the surface from a nickel-containing solution without electrolysis. Electro-less nickel plating provides a shiny appearance, excellent hardness, abrasive, wear, and corrosion-resistance to the substrate material.
Alodine
Provides excellent corrosion resistance property to the aluminum parts with greenish-gold color. It is the low-cost and quick surface finishing approach.
Electroplating
Electroplating increases the hardness of the steel &aluminum parts. It offers excellent corrosion, wears, and abrasion resistance.
Nickel plating
Make the parts super resistive to corrosion. It enhances mechanical strength, hardness, wear resistance, lubricity, and ductility. Nickel plating is applicable in different materials, including Steel, aluminum, copper, and brass.
Passivation
Enhance the appearance and functionality of the parts. After Passivation, parts of Steel and its alloys become super resistive from corrosion.
Yellow Chromate conversion coating
A shiny appearance with goldish color provides excellent corrosion resistance. It is applied on the surface of aluminum, magnesium, and their alloys. A layer of chromate also enhances the conductivity of parts
PTFE (Teflon) Coating
The Teflon layer on the parts offers excellent corrosion resistance, water resistance, and non-stickiness with a non-reactive surface.
Fine machining
The higher-precision machines produce delicate machining surfaces by utilizing sharper tools and regulating feed rate and cutting speed. Surface roughness up to Ra 0.8 μm can be maintained with smooth machining.
Laser Cladding
Provides excellent corrosion, wear, and abrasion resistance. Laser Cladding is also effective for treating minor surface imperfections such as cavities, tiny cracks, and rust damage.
Sanding
Provides a random, non-linear texture with a shiny, high gloss finish. However, it might be unable to create sharp corners and pockets
Precision Machining Tolerances
CNC Milling Service
Manufacturing Specifications & Capabilities
Type | Tolerance | No Drawing |
| Linear dimension | +/- 0.025 mm +/- 0.001 inch | ISO 2768 Medium |
| Hole diameters (not reamed) | +/- 0.025 mm +/- 0.001 inch | ISO 2768 Medium |
| Shaft diameters | +/- 0.025 mm +/- 0.001 inch | ISO 2768 Medium |
| Part size limit | 950 * 550 * 480 mm 37.0 * 21.5 * 18.5 inch | ISO 2768 Medium |
3 Ways to Ensure Perfection
Standards
GENERAL TOLERANCE
For metals, the standard is ISO-2768 fH (fine)
For plastics, the standard is ISO-2768 mK (medium)
Metric threads tolerances：ISO 965-1 standard UN Threads Tolerances: ASME B1.1-2003 standard
knurling: ISO13444:2012 standard Our factory is ISO 9001:2015 certificated
Visual inspection and Protection
Constant visual inspection conditions
Quantification of cosmetic surface quality
Process requirements
Part cleaning and Protection
Quality Inspection Report
Inspection Confirmation
Dimensional confirmation
Appearance confirmation
Quality documentation
Design guides
Technology Overview
What is CNC Milling?
CNC milling is an abbreviation for Computer Numerical Control milling. So, the milling operations are numerically controlled by the computers here. CNC milling machines, like cutting and drilling machines, use rotary tools to cut away at a workpiece into the desired shape. Because a computer controls the movement of tools and other machine parts, there will be no human error, resulting in precise parts with tight tolerance. CNC milling can work with any manufacturing material, from steel to plastic.
The instructions for part creation are generated when we load the CAD file into the CNC milling machines. The computer controls the coordinates and positions along with the tool’s movement. CNC milling is used in many industries Such as automotive, aerospace, defense, Medical, and more.
Principle of CNC Milling
The milling process begins with the positioning of the workpiece and tools. Next, the workpiece is inserted into a holding device, and tools are inserted into the spindle. The CAD file determines the milling direction (horizontal or vertical). Once the tool and workpiece placement is complete, a program is edited and executed. The tools are now moved to create the desired shape based on the instructions.
The milling cutter tools move through the multiple axes to create the parts where several operations other than cutting might be needed, such as drilling holes and slots. A milling cutter can move along multiple axes and make several shapes, slots, holes, and other impressions. Milling machines usually have four directions for operations X, Y, Z, & W. The horizontal movement is represented by X and Y. The Z axis represents vertical movement, whereas the W axis represents diagonal movement across a vertical plane.
Different types of CNC Milling
There are four common types of CNC milling operations. Plane, face, angular, and form milling are all options. These milling operations are selected during manufacturing based on the work piece’s shape requirements.
Face milling uses a tool with teeth on its periphery and face. The peripheral teeth cut the workpiece, and the face teeth finished the surface. The plane of the workpiece is positioned at a right angle to the tool axis.
In Angular milling, the cutting tool is placed in a way that makes a specific angle to the workpiece surface to create a design-angle cut, such as a groove or a dovetail. It is generally applicable when Milling planes are neither parallel nor perpendicular to the tool axis.
The milling of irregular surfaces like curve planes is accomplished by form milling with the help of a special cutter called a formed cutter. Various complex parts needed to be created convex, concave, hemispherical, or other complicated shapes, Thanks to formed milling.
Plain milling, also known as surface milling, is the most commonly used type of milling in which the milling cutter axis is parallel to the surface being milled. It is the best method when a large amount of material needs to be removed.
See why customers dig us
Yesterday, I received the parts for my musical instruments. These are incredibly consistent and accurate.
The delivery timing and quality of the CNC machining service amaze me. I would recommend Prolean with my other business friends too. Thank you!
-Ema Alves, Owner at Conserve the Sound
Prolean has been manufacturing numerous customized components for my metal-workshop machines for the past two years, and I have found that they are excellent with their CNC machining services.
I am delighted with the level of quality they offer and the precision of the customized machine parts.
-Mason Lucas, Purchasing manager at Alpha Manufacturing
ProLean has consistently provided me with excellent milling service using their 5-axis CNC machine. I've worked with many contract manufacturers, but other than ProLean, I've never found accurate tolerance on my parts.
We were able to satisfy our client's needs thanks to Prolean's prompt reaction. Additionally, I frequently found that their engineers are always willing to innovate creatively to deliver top-notch service.
-Tanesha Adesina, Technical manager at Bossard Technology
I needed a quick prototype for my research, but I had no idea that their CNC machines were so sophisticated and could produce it in just three days. The prototype was quite precise and fell within the tolerances of the CAD I provided.
Thumbs up! Not just selling, nothing else count for them; Service Service Service, first!
-Jason Barrett, Individual Mechanical Engineer
I have been collaborating with ProLean to produce PCB boards for our business For the last year. Continuous technical assistance and communication with the manufacturing.
Engineers and mechanics help us continuously satisfy our customers' expectations. I hope that this collaboration continues for a very long time.
-Rugen Thakur, Mechanical Engineer at Cipsa- Tech.
The heat sink was marvelous, within the critical tolerance, and the surface finish was excellent. The fan position, seal, and fin structure all performed as intended. I'll tell my friends and other electronics companies about your service.
I appreciate your exceptional communication and CNC-Machining service.
-Blake Henderson, Product Designer at MechaTronix,
It's challenging to describe the Prolean in a few words, but the three stand out: Fantastic, Amazing, and Perfect.
The best addition to our firm has been Prolean. With their cutting-edge 5-axis CNC machine, they are providing the service of replacing and installing new components in our pharmaceutical development industry with accuracy and cleanliness as their top concerns.
-Jose Gaonkar, Mechanical Engineer at Cadila Pharmaceuticals
I purchased several custom CNC-machined parts for mechanical tools from Prolean, and I want to remark that their quality and accuracy were far superior to those of some of the more prominent machine tool manufacturers.
Prolean's engineers could explain everything to me in a language I could comprehend, even though I am not a mechanist and may have asked the wrong questions.
-Evert Wagner, Product Designer at HYDAC Supplier
FAQ
Technical FAQ’s
What is the lowest thickness I can implement into my design to prevent warpage?
We recommend a minimum thickness of 0.5mm for metal and 1mm for plastic. The value, however, is heavily dependent on the size of the parts to be manufactured. For example, if your parts are much smaller, you may need to increase the minimum thickness limit to prevent warpage, and for large parts, you may need to lower the limit.
What is a 5-axis CNC machine?
Five-axis CNC machines can move through 5-axes, allowing the operator to simultaneously mill over five sides of a workpiece.The A, B, and C axes rotate separately from the X, Y, and Z axes. The machine’s configuration or CAD design determines which two of the three additional rotational axes are used.
General FAQ’s
What kind of CNC milling equipment do Prolean use?
We have rapid prototyping facilities at prolean that include high-end 3-axis, 4-axis, and 5-axis CNC machining centers from Haas and JingDiao.
Why choose CNC milling?
What is the key difference between CNC milling and Turning?
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