Jump to content
  • Welcome to Auto Parts Forum

    Whether you are a veteran automotive parts guru or just someone looking for some quick auto parts advice, register today and start a new topic in our forum. Registration is free and you can even sign up with social network platforms such as Facebook, Twitter, Google, and LinkedIn. 


Machining is very popular to be used in auto parts

Jerry Zhang

Recommended Posts

CNC lathe machining is a procedure for change the workpiece’s dimensions. There are two categories according to the difference of processing method, One is CNC lathe machining, the other is press working.


What is CNC lathe machining

1. CNC lathe machining definition

CNC lathe machining is a procedure for change the workpiece’s dimensions. There are two categories according to the difference of processing method, One is CNC lathe machining, the other is press working.


CNC lathe machining Function: Change the workpiece’s dimensions


CNC lathe machining, Press working Technics Process: Casting, Forging, Stamping, welding

2. Catalog:

(1) Fundamental process

(1.1) Productive Process
(1.2) Productive Category
(1.3) Process Planning

(2) The instruction for benchmark

(2.1) Definition
(2.2) Category

(3) CNC lathe machining Processing Cushion

(4) Scope of application

(5) Types of equipment

(6) China CNC lathe machining manufacturers

3. CNC lathe machining fundamental process

(i) Productive Process

Types of equipment productive processes are the process for making the products from raw material (unfinished blanks).
Types of equipment productive process include raw material transit and storage,
CNC lathe machining production preparing, unfinished blank making,
Precision parts’ CNC lathe machining and heat treatment, precision parts’ assembling, test, painting, and package, etc.

Technics process

In the productive process, there is a technical process.
Technics process is the process to change the workpiece’s shape, dimensions, positions, and character, etc, and make the workpiece to finished precision parts or unfinished blanks.
Technics process is a key part of the productive process.
Technics process includes casting, forging, stamping, welding, CNC lathe machining, assembling, etc.
Types of equipment production technics process include precision parts’ equipment production technics process and types of equipment assembling technics process.

Auxiliary processes

Others are auxiliary processes, for example, transit, storage, power supply, equipment repair, etc.
Technics process also consists of one or several tactic processes, one process consists of several steps.
A process is an elementary unit for types of equipment production technics process.

Process definition

Process definition is the technics process, that one worker (several workers) finish production continuously on one machine (or one position) for the same workpiece (or several workpieces).
The main characteristic of the process is that it doesn’t change the workpiece, types of equipment, or operator, and continuously.
The step is based on the same CNC lathe machining surface, the same CNC lathe machining tools and the same volume of feed
The Feed is a working process, which is a step for production finish on the workpiece’s surface by tools.

Technics flow

When making the types of equipment’s technics process, you have to make sure how many steps the workpiece needs and the sequence.
Technics flow is a simple process of key processes and sequences.
Technics flow is very important for making technics process,
Its function is to select the correct processing method for each surface, make sure the sequence of each surface, and the number of processes.

(ii) Productive Category

Productive Categories are usually divided into three categories,

a. Single workpiece production:

Manufacture different structures’ and dimensions’ workpiece separately, and seldom repeat.

b. Batch production:

Manufacture the same structure and dimensions’ workpiece among one year, there is some repeatability in the manufacturing process.

c. Mass production:

The quantity is huge, manufacture the same process in the same place.

(iii) Process planning

Planning principle

1. Every technological procedure is planned to make sure the quality of precision parts (types of equipment assembling), And reaches all the specifications as the drawing requests.
2. The technological procedure should have high productivity, The products made by technological procedures should be launched as fast as possible.
3. Try our best to decrease the production cost
4. Pay attention to reduce the intensity of labor to ensure production safety.

Raw data

1.Assembling drawing, precision parts drawings
2.Inspection quality standard
3.Yearly production program
4.Conditions of manufacture, including types of equipment and specification, performance and current status, workers’ technological level, power and water supply, etc.
5.Process planning, manual, and standard.
6.Advanced manufacture data


1. Analysis product’s assembling drawing and precision parts’drawings.
2. Confirm the blank
3. Make technics flow and ensure the position reference surface
4. Prepare the types of equipment according to each preocess
5. Prepare the blades, jigs, measuring implement, and auxiliary tools
6. Ensure the specification and inspection method for each process
7. Ensure the allowance for CNC lathe machining, calculate the size and tolerance
8. Ensure the cutting parameters
9. Ensure the production time

4. The instruction for benchmark of CNC lathe machining

(i) Definition

Precision part consists of several surfaces,
When analyzing the relative relation of the surfaces, you must confirm a benchmark.
Benchmark is a dot, line, and surface to confirm the part’s dot, line, and surface.
According to the different functions of the benchmarks, there two categories,
One is the design benchmark, the other is the technical benchmark.

(ii) Category

1. Design benchmark:

The benchmark to confirm the dots, lines, and surfaces on the drawings

2. Technics benchmark:

The benchmark for production and assembling.

3. Assembling benchmark:

The benchmark for confirming the parts’ position in the products when assembling

4. Measure benchmark:

The benchmark for inspecting the sizes and position

5. Locate benchmark:

The benchmark for CNC lathe machining.

5. CNC lathe machining Processing Cushion


When the blank is made to finish the product, you will be machining out the metal layer,
The total of the metal layer is called the total processing cushion.
The metal layer of every process is called process cushion.
As to the circle and hole, the processing cushion is on the diameter, called symmetry cushion.


The reason, why the workpiece has the processing cushion, is to CNC lathe machining out the tolerance or defect on the workpiece from the last process, for example,
The cold layer of casting parts, bubble hole of casting parts, the sand layer of casting parts.Oxide skin of forging parts, surface crack of forging parts, decarburized layer of forging parts.
The surface roughness of CNC lathe machining, etc.


The processing cushion can increase the precision and roughness of workpieces.
The volume of processing cushion will affect the product quality and production efficiency.
If the processing cushion is too big, it will increase the CNC lathe machining sum of labor,
Decrease the production efficiency, increase the loss for raw material, tools and power,
And increase the production cost.


If the processing cushion is too small, the tolerances and defects from the last process cannot be removed, 
The tolerances for loading and unloading cannot be removed too.
The principle is selecting the smallest processing cushion based on high quality.

Scope of application

1. Different metal parts CNC lathe machining
2. Fabrication, box structure, metal structure
3. Titanium, high-temperature alloy, nonmetal CNC lathe machining
4. Design and manufacture of wind tunnel combustion chamber
5. Design and manufacture of non-standard types of equipment
6. Design and manufacture of molds

Types of equipment

CNC mill
CNC grinding machine
CNC machine
CNC center

Laser welding

Electric discharge machining (EDM)
Universal grinder
Cylindrical grinder
Internal grinder
Precision lathe

China CNC lathe machining manufacturers

3 Levels of manufacturers in China

During the development of more than 50 years, there are 3 levels of manufacturers in China,
10% is a top-quality manufacturer, 20% middle quality manufacturer, and 70% low quality & cheap price manufacturer.

The global markets

At present, many markets are growing all over the world, such as Poland, Czech, Turkey in Europe, Thailand, Vietnam, the Philippines, India in Asian, Brazil in South America.
Compared to these new growing markets, China has many advantages based on high quality.

China CNC lathe machining market developing

In the past, everybody think made in China is for cheap and low quality,
It’s because China doesn’t have high precision types of equipment and skilled workers,
It looks like these new growing markets very much.
But now, 10% top quality manufacturer is fully changed,
Their core advantage is high quality, they compete with European and North American famous factories.

Introduction of Sinster

Ningbo Sinster Machine Co., Ltd is one of 10% top quality manufacturer,
You have no risk to cooperate with Sinster,
As many famous brands already choose Sinster and cooperate for long-term,
Such as Supernova, Pelican, ELKA, Cal-van Tools, Firepro, Tecflo, SEB, Keyence, MAUL, RTS, etc.
You can visit the website at www.syluecncmachining.com to find more information,
Don’t forget to send inquiry to [email protected]

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Similar Content

    • By Sunny Tang
      Polishing technology is widely used in precision machining field, It’s very important processing that no matter for precision machined parts or Mold Parts. With the wide application of hardware products, the appearance quality requirements for hardware is becoming more and more higher, then the requirements for surface polishing will also be higher, and the roughness requirements for mirrored and highlighted surface products is especially higher, so the requirements for polishing also becoming higher and higher. Polising Not only increases the beauty of the precision machined parts, but also can improve the Corrosion and wear resistance of the material surface for precision machining parts, it also Convenient to Injection molding processing such as making plastic products easy to demold, reduce the production of injection cycle etc.
      A:Rough polishing and grinding: The surface was normally rough after processing of Lathe, Grinding, CNC, cutting or EDM, It need be polished by using oilstone, Use kerosene as the lubricant,the General order of use will be #180 ~ #240 ~ #320 ~ #400 ~ #600 ~ #800~ #1000.
      Whetstone polishing is very important and difficult processing, According to the different specifications of processed products like automotive parts, Cross lapping was performed equably at an Angle of about 70 degrees, The optimal round trip range is about 40 ~ 70 mm. Whetstore processing will also be changed according to the material for machined parts, In order to save the time, they will choose #400 to start.
      B: Normal Polishing mainly use sandpaper and kerosene.After Whetstone processing will be sanding paper, When sanding paper, pay attention to the round edges, sharp corners, round corners and orange peel appears. so the process of whestone should be done with high precision. The important point for Sanding paper: Sand paper is intersected with hard sticks for grinding like Whetstone processing , and the grinding frequency of one side of sand paper is about 10 ~ 15 times. If the grinding time is too long, the abrasive force of sand paper will be reduced, and then it will lead the surface finish be uneven( This is one of the reason for orange peel appears). sanding paper usually use bamboo piece to grind, Actually the optimal ways is use the wood bar with less elastic or aluminum bar with Low hardness to grind at a 45 degree angle. The grinding surface should not be rubber or highly elastic materials, it can be grind at Acute Angle if the shape can’t grind at 45 degree angle. The Numbers of sandpaper are #220~ #320~ #400 ~#600~ #800 ~#1000~#1200~#1500. In fact #1500 sandpaper is only suitable for hardened die steel (above 52HRC) and not for prehardened steel as this may cause surface burns to the prehardened steel.
      C:Precision polishing mainly use diamond paste. If use polishing wheel that mixes diamond abrasive powder or paste to grinding, The paste and polishing wheel can remove the Grinding crack that remained by #1200 and # 1500 sand paper. and then polishing by using felt and diamond paste.It can use the clean polishing chamber in mold processing workshop directly if the polishing precision is Ra0.2, If the polishing precision is very high, then it must use an absolutely clean space to process. It will scrap the polishing surface in high precision if the space has Dust, smoke, dandruff and spittle.
      Our Kanou Precision use these polishing technology to service the customer, and also provide kind of solution for customer’s project. We always provide the precision machining part, cnc machined part, CNC turned part, CNC millded part, Mechanical components, automotive spare part to customer, Especially for mass production auto part, these all need this polishing technology, and we received highly praise from customer. We will keep to learn more polishing skills, and bring more advanced polishing tool and meterial to provide more high precision spare parts to customer.
      Do you want to know more knowledge about technical skills? pls check this link for more: www.kanouprecision.com/blog/

    • By Sunny Tang
      Most people who are new to industry have a difficult time knowing the difference between CNC Milling and CNC Turning. these two processes seem quite similar. But they differ from how they operate to complete the desired part.
      CNC Turning
      CNC Turning Machines are one of the oldest and simplest forms of machining parts, called “lathes,” and can be either horizontal or vertical depending on the weight and tolerance of the workpiece. The primary function of a CNC Turning Center is that it turns your workpiece. Workpieces for this process are usually round, but can be other shapes — like squares or hexagons.
      The workpiece is held in place by an instrument known as the “chuck.” The chuck then spins at various RPMs (depending on the capability of your machine). When this occurs, the machine’s tool moves into the rotating workpiece and begins to shave away material to create the desired shape.

      In this picture, we have a CNC Milling Machine with all the above-mentioned components as well. The top part is the Spindle, which holds the Tool. This part spins at high RPMs and moves back and forth, left and right, up and down to mill away the material.The workpiece, which in this case seems to be a gear or clutch, is held in place by the bed. Some CNC Milling Machines have the capability to move the bed in conjunction with the spindle to attain specific shapes at certain degrees. Because of these capabilities, CNC Milling offers cutting solutions for more complex parts, like engine components, custom tooling, intricate mechanisms and enclosures.
      Simple In Summary,
      1.Cnc turning Machine can handle only cylindrical ,or circular workpiece.While cnc lathe is used for all types of workpiece but relatively less in size.
      2.CNC turning machine is turn the workpiece, the CNC milling machine is turn the tool.
      If you want to know more about cnc, pls feel free to contact me:
      [email protected]
  • Similar Topics

    • By Dan
      CLA 200 AMG Line 2019 body parts 
    • By RockAuto
      Get up to $150 with purchase of qualifying Auto Meter products.View on RockAuto.com
    • By CarPartAU
      Are you thinking about selling your auto parts? If so, then Car Part is the place where you can Sell Parts Online. Car Part is a resourceful platform to expand your reach as an auto parts seller. We will connect you with the interested buyers to provide you the comprehensive price for your auto parts. For more details, visit our website today.

    • Shop AutoPartsToys.com for all Your Car, Truck and SUV Accessories at Direct Factory Warehouse Pricing
    • By APF
      FindItParts is the one-stop shop for all your heavy duty truck parts and trailer needs
      We specialize in meeting all your parts and accessories needs for your heavy duty truck and trailers. We are veterans of the heavy duty truck parts business who started by building and scaling from one heavy duty truck parts branch to twenty five branches. Seeing the challenges that many customers faced we set out to transform the industry and create a better buying experience. We took the best of both worlds by allowing customers to order online 24x7 with easy lookup by part number, keyword or cross reference. We paired the online experience with skilled professionals available to assist customers with any technical questions. We offer a best in class online experience with order tracking and complete access to purchase history.
      FinditParts serves owner-operators, fleet managers, municipalities, distributors, repair facilities and resellers with concierge level customer service. Our team of technical parts specialists is on hand daily to assist buyers with any of their needs, from identifying and sourcing hard to find parts to fulfilling stock order requests. If you're a business with a fleet of heavy duty trucks, tractors or trailers, a repair facility or a distributor of parts, learn more about our Business Solutions today. With millions of parts in our catalog on an easy-to-use website, FinditParts is the largest single-source Internet distributor of heavy duty OEM and aftermarket parts. From hard-to-find parts to everyday preventative maintenance items, FinditParts is your partner in keeping your heavy duty truck on the road.

  • Create New...