After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn more
LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 13025524621Dlynn9527@gmail.com
Secondary Operation Service
Over 20 different kinds of surface finishes for you.Make your part more corrosion resistant and aesthetical.
Home / Secondary Operation
Precision machining meets personalization
We look forward to delivering high-quality products and professional services to meet your expectations and requirements.
| Name | Tolerance | Applicable material | Application | Appearance | Color | |
|---|---|---|---|---|---|---|
 | Smooth Machining | Smooth Machining | Metals | remove burr | Clean and smooth without burrs | NA |
 | Polishing | Polishing | Metals | remove the veins of the metal surface | smooth and shiny | NA |
 | Brushing | Brushing | Metals | surface defects are partially removed | uniform bright striped surface | NA |
 | Shot Blasting | Shot Blasting | Metals | removes surface streaks and defects | matt and rough | NA |
 | Powder Coating | Powder Coating | Metals、carbon fiber | hide metal defects | metal defects will be totally hiden | customizable |
 | Spray Painting | Spray Painting | Metals | praying paint, pigment, or color to a solid surface as a colored protective layer | / | customizable |
 | Black Oxide | Black Oxide | Steel、Copper、magnesium | reduce the light reflection | / | black |
 | Passivation | Passivation | aluminum、Copper、stainless steel、titanium | as the basic for painting | Smooth and uniform surface | NA |
 | Parkerising | Parkerising | Metals | pretreatment of painting to strengthen film adhesion | / | Grey or black |
 | Anodizing | Anodizing | Aluminum、Magnesium、Titanium | the most widely used and most successful wear resistance surface finish technology of aluminum alloy | / | customizable |
 | Electroplating | Electroplating | Metals | improve wear resistance, electrical conductivity, reflective property, corrosion resistance and aesthetics of the metal product | / | Depend on the material of layer |
 | Electrophoresis Deposition | Electrophoresis Deposition | Metals | More environmentally friendly than other coating technique | / | customizable |
 | Baking finish | Baking finish | Metals | Resistant to water, dust,grease and easy to clean | / | customizable |
 | Thermal spraying | Thermal spraying | Metals | As protective or functional surface layer | / | Depend on the material of layer |
 | Physical vapor deposition | Physical vapor deposition | Metals | As protective or functional surface layer | / | Depend on the material of layer |
 | Antirust oil for electrostatic spraying | Antirust oil for electrostatic spraying | Metals | Antirust | / | NA |
 | Cleaning services | Cleaning services | Metals | Remove the carbonizing film and oil of the surface | / | NA |
LML's portfolio of secondary operation
Secondary operation will improve aestheic or prevent injuries from sharp corner of the products.
Knurling
Chamfering
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn more
Grinding
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn more
Heat Treatment
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn more
welding
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn more
riveting
After knurling, it can increase the sense of beauty of the part and make it easy to handle. It is often used for the outer surface processing of casing, hinge wrench and other parts
learn moreCosmetic Finishes
Surface finishes can have either a functional or aesthetic intent. Finishes that cater to both aspects are classified as cosmetic finishes and are frequently employed for enhancing the appearance of different parts. The fabrication of these parts demands additional measures to minimize defects such as tool-induced marks and scratches.
Functional
There is no necessary to have aesthetic look.Machining veins will be seen
- Smooth machining
- Passivation
- TYPE III andozied
- Glossing
- Brushing
- Black oxide
- Mechanical Polishing
- Etching
- Degreasing
- Electroplating
- Electrophoresis deposition
Matte
slogan：Removes surface streaks and defects, make surface matt and rough
- Blasting
- Acid pickling
- Passivation
- Parkerising
Functional
There is no necessary to have aesthetic look.Machining veins will be seen
- Chemical or electrochemical polishing
- Blasting+Anodizing
- Glossing+Brushing
- Glossing+Polish
- Powder coating
Wide Array of Materials We Offer
Call on RapidDirect’s staff to recommend the right materials from our rich selection of metal and plastic materials with different colors, infill, and hardness. Every material we utilize comes from reputable suppliers and is thoroughly inspected to ensure they can be matched to various manufacturing styles, from plastic injection molding to sheet metal fabrication.
Competitive Prices
You are guaranteed 30% lower costs and competitive prices to help you settle your material and start your project.
Reliable supply chain
Apart from self-owned factory, we have thousands of suppliers to maintain a stable supply of materials.
Superior Quality
Each of our material bears certified material certification to guarantee excellent quality for your parts.
Professional Support
Creative engineers and technicians are happy to help and recommend the suitable material for you.
Introduction to the common process of cnc metal materials
We can generate instant machining quotes for 50+ metals and plastics.
Metal CNC services
LML provides the most advanced CNC metalworking services to ensure superior product quality and fast delivery. We have more than 60 metal milling machines and metal lathes that we can offer with the capacity and competitive prices. We accept small orders for CNC metal parts with a MOQ of 1 and can handle more complex CNC machining work, while we accept urgent orders. With LML, you can get the perfect products and thoughtful service you want, we are your friends in China.
Metal machining
Metal machining is the process of cutting down a raw piece of metal to create a desired shape or object. This process is done most accurately with a CNC (Computerized Numerical Control) machine, which can produce almost any three dimensional object designed via CAD (Computer Aided Design) software. Our network of machinists mainly uses 3- and 5- axis CNC machines for producing any metal parts that pass our online DFM checks. State-of-the-art metal CNC machines, like the ones we use, are able to cut complicated features on parts with great accuracy, while maintaining tight tolerances.
Metal CNC Milling
CNC milling removes materials from the workpiece to create custom-designed parts with flat surface using cutting tool or multi-point milling cutters.
WIth our 3-axis & 5-axis CNC milling services, you can get milled parts with tight tolerance up to 0.02mm (±0.0008 in.)
Metal CNC Turning
CNC turning shears materials from the ouside of a rod at incredible speeds using a spinning tool. At RapidDirect, we apply 50+ CNC lathes and CNC turning centers to create round or cylindrical turned parts with extreme precision that consistantly meet customers’ expectations.be higher.
Gallery of surface finishing part made by LML
The metal part can serve as functional or aesthetic purpose,and the way of usage will decide on the type of surface finish.
Defining an A and a B side
We can generate instant machining quotes for 50+ metals and plastics.
Surface finishing often leaves aesthetic defects on yourparts, such as hang marks for anodizing. Defining an Aand a B-side in your design will ensure that the most important areas of your part remain free of defects
In this image you can see how you can define an A-side and a B-side in your technical drawina:
A side: Indicates the most aesthetically importantsurface, typically the visible side of your product.
B side: Indicates the side that is not aesthetically important, typically the side hidden from visibility after assembly
For the primary surface (A-side) of your part, we guaranteedefect-free production. In contrast, secondary surfaces (B-side)may be machined with hanging marks and other minor defects. Bside surfaces, like the rest of your part, will be free of scratches.stains and blemishes.
Manufacturing vetted network of our service
We look forward to delivering high-quality products and professional services to meet your expectations and requirements.
Consistency requirements
Each part must be visually consistent across the same batch.meaning:
- Same grit must be used across parts for sanding orbrushing
- Brush marks must be in the same direction*
- Color must be consistent to the same pantone when parts are placed next to each other
- Gloss units must be consistent across the batch
* Manual brushing marks will be as unidirectional aspossible. Please note that for rounded geometries, brushingmarks may not be entirely unidirectional.*
Visual inspection conditions
The surface quality of every part must meet the followingconditions:
- Distance: 50cm +10cm (19,7 in + 3,9 in) with a 10/10 vision(or corrected)
- Incidence angle: Approximately 45 in all directions
- Lighting conditions: 500-1000 Lux, color 3300-5300 Kelvin(neutral white)
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The metal part can serve as functional or aesthetic purpose,and the way of usage will decide on the type of surface finish.
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FAQs
LML takes the stress out of manufacturing by guaranteeing the quality and consistency of every part. Each order is dimensionally and visually inspected by our in-house quality control team to make sure it meets the LML Standard. If you’re not satisfied with your order, we’ll remake your parts as fast as possible, free of charge, or refund you - whichever you prefer.
- Why 5-Axis CNC Machining Has Superior Advatages?"5-Axis" generally refers to the ability of a CNC machine to move the tool in five directions, which belongs to a high precision production technology.
- GALLERY OF CNC MACHINED PARTSGALLERY OF CNC MACHINED PARTS
- Could I have a look at your production facility for sliver contacts?Cold Heading & Stamping Workshop
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LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 13025524621Dlynn9527@gmail.com
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