VMT is a hardware precision parts processing factory located in Building 18, Dajiang Industrial Park, Genzhuyuan Community, Matian Street, Gongming District, Shenzhen, Guangdong Province. Welcome to visit our factory.

You can provide 2D/3D drawings or send samples to our factory, and then we can make them according to your samples.

Yes,We can support silk printing, pad printing, laser engraving, etching, cnc machining engraving.

Material, surface treatment, tolerance requirements, appearance requirements.

Samples are available and some are free.

If in Stock: around 3 days after payment. Mass production: around 20~25 days after receipt of deposit (Accurate delivery time depends on specific items and quantities)
 

Yes, we will never disclose customer information to anyone else, and we have a software confidentiality system.

We mainly make customized products according to customers' drawings or samples, so we don't have cataloge. Each customer's needs are different. We can provide company profile.

All of our products are produced after customers order. We do not make inventory waiting for customers to orders. because each customer's need different products.
 

Could you provide samples? Our engineers will make drawings according to your samples for your confirmation before production.

Before each project starts, 1 piece is needed to verify the performance, so in order to create value for our customers, there is no MOQ requirement.

Customer's Demand、Anodized 、Plating、PVD 、Nickel Plating、Sandblasting、Powder Cating、Polishing、Multi-color anodized、Painting etc.

We can process Aluminum (AL 6061-T6, 6063, 7075-T 2014 2017 2011 etc), Stainless Steel (303,304,316L, 17-4 (SUS630) etc ), Copper (C36000 (HPb62), C37700 (HPb59), C26800 ( H68), C22000(H90) etc), Iron (4140, Q235, Q345B,20# ,45# etc. ), Titanium (TA1,TA2/GR2, TA4/GR5, TC4, TC18 etc), PEEK, Nylon, PMMA. 

CNC machining can be divided into two types according to the machining accuracy, namely rough machining and finishing. Usually, rough machining is performed first, and then finishing is performed, which can effectively improve the machining accuracy of the workpiece. This article will mainly introduce the difference between roughing and finishing of CNC lathes, so that everyone can have a better understanding of CNC machining.

Since CNC machining is a subtractive machining, CNC milling parts are run with the highest precision. CNC machining machines can reach an ultra-high level of accuracy, and even some machines can reach an accuracy of +/-0.0025mm, and there will be CNC machining tolerances. Because each CNC machined part has a different degree of material and shape, the required accuracy also has a different degree. The tolerances of CNC machined parts are also different.

 

 

Since CNC machining is a subtractive machining, CNC milling parts are run with the highest precision. CNC machining machines can reach an ultra-high level of accuracy, and even some machines can reach an accuracy of +/-0.0025mm, and there will be CNC machining tolerances. Because each CNC machined part has a different degree of material and shape, the required accuracy also has a different degree. The tolerances of CNC machined parts are also different.
 

 

 

What is a Tolerance?

 

 

Tolerance is the accuracy level of the measured value required by CNC machined parts. In short, it is the allowable interval value of the final size of the CNC machined part or the measured value expressed by the machining tolerance. It usually starts with the ± symbol. For example, a CNC machined part with a height of 1.5 inches requires a tolerance of ±0.005"", so the final CNC machined part should be within the range of 1.495"" and 1.505"" to pass the quality inspection.

 

 

Clarify the tolerances of CNC machining parts so that the CNC machining service manufacturers can control the tolerances of the parts. The smaller the tolerance value, the higher the accuracy requirements of the manufacturing industry. Conversely, the larger the tolerance, the looser and the lower the required accuracy.

 

 

 

 

 

 

 

Common CNC Machining Parts Tolerance Categories

 

 

 

1. Standard tolerance

 

 

We know that tolerance is the control of the accuracy of CNC machined parts. CNC machined parts such as threads, cuts, pipes have standard tolerances. Numerically controlled machined parts for a wide range of uses require standard tolerances. Most CNC milling services provide ±0.1MM, which is also the general CNC machining part tolerance standard specified by the mechanical engineer when the customer does not specify the tolerance level. Standard CNC machining tolerances are usually set by various international standard organizations, the most common are (ISO) International Organization for Standardization, (ASME) American Society of Mechanical Engineers, etc.

 

 

 

 

2. Geometrical dimensions and tolerances

 

 

This is a more standard and thorough tolerance standard than other tolerance systems. Geometric tolerances and dimensions are the tolerances of CNC machining parts, highlighting the measured value and deviation interval. For example, the flatness, true positioning position and concentricity of CNC machined parts. Geometric dimensions and tolerances are usually used for high-precision CNC machined parts.

 

 

 

 

3. Unilateral tolerance

 

 

The so-called single-sided tolerance refers to the deviation value in only one direction. The deviation is only positive or negative. Also listed as ﹢0.01/﹣0.05mm. In other words, the finished CNC machining parts can be expanded to 0.01mm or reduced -0.05mm. This means that it cannot be larger than the specified size, otherwise it cannot enter the corresponding location.

 

 

 

 

4. Bilateral tolerance

 

 

When the CNC machining parts require bilateral tolerances, the given dimensions must be positive or negative. This means it can be larger or smaller. For example, ±0.05mm means that the length of the specified measurement value of the CNC machined part is 0.05mm. Bilateral tolerances are mainly used for external dimensions.

 

 

 

 

5. Limit tolerance

 

 

The limit tolerance is a CNC machining tolerance, a series of tolerance values that represent the limit. As long as the CNC machined part is within the measurement interval, this type of tolerance value can be used. For example, the minimum tolerance is 11MM and the maximum tolerance is 11.5MM, which is a limit tolerance value. This means that 11-11.5mm is only between 11mm and 11.5. 

 

 

 

 

Precautions for Tolerance of CNC Machining Parts

 

 

This is one of the keys to determine the correct tolerances of CNC machining parts, and it is the key to clearly understand whether the size or dimensional change of the part is suitable for the performance and function of the part.

 

 

1. Material tolerance

 

When specifying the tolerances of CNC machining parts, the use of materials is generally considered, which is related to the achievable tolerance level. Includes the following functions:

 

a. The hardness of metal: the hardness of metal is one of the factors that affect the tolerance of CNC machining parts. Since cutting tools change their dimensions during the machining process, it is difficult for softer materials to be CNC machined with strict tolerances. Therefore, processing softer materials tends to consume more time.

 

b. Corrosiveness: Rough materials are usually hard during CNC machining and may even cause more wear. Therefore, it is more difficult to specify tolerances for CNC machined parts for such materials.

 

 

 

 

2. Selection of manufacturing method

 

 

Due to different CNC machine tools, the machining accuracy is also different. CNC machine tool tolerance standards determine the degree of CNC machining that the machine tool can handle. In this case, the machinist must perform additional operations on the CNC machined parts to achieve the fine tolerance range of the CNC machined parts you need.

 

 

 

 

3. Inspection

 

 

This is a process that takes a lot of time to check precision CNC machined parts. Must have professional inspection tools or equipment, such as two-dimensional inspection, three-dimensional inspection, etc.

 

 

 

 

4. Cost control

 

 

The accuracy of tolerances directly affects the quality of CNC machined parts and also affects the cost. The higher the accuracy, the more expensive it is, and the speed of CNC machining parts will be slower, which requires more precise CNC machining tools. High-precision CNC machining parts inspection requires more comprehensive CNC machining inspection equipment. Another factor that affects the cost of tolerances of CNC machining parts is the failure rate, which tends to be higher. High-precision tolerance machining will increase the production cost of CNC machining and the cost of quality inspection.

 

 

 

 

How to Choose the Right Tolerance of CNC Machining Parts?

 

 

1. Find a reputable CNC machining parts company

 

 

If you are looking for a suitable CNC machining parts company, the first thing you should consider is a trustworthy CNC machining parts service company, which will help you better communicate and understand. Professional manufacturing experts will discuss the specifications and goals of the project with you, and at the same time give you the best advice and the best solution.

 

 

Under normal circumstances, engineers or designers will plan their tolerance range, and then submit the specified manufacturing tolerance request to the CNC machining parts service company. This provides a shortcut for CNC machining services and saves production and time costs.

 

 

Also note that if no tolerance is asked or specified when producing a CNC machined part, most CNC machining services will automatically use its standard tolerance, which is usually about ±0.001 inches (±0.0.0254 mm). For example, if the hole of a CNC machined part is too small, even if it is 0.127mm, installing its adjacent CNC machined part in the hole may be more challenging than necessary.

 

 

 

 

2. Think about the tolerances of CNC machining parts you need

 

 

Not all CNC machined parts need to be designed with strict tolerances. The specific usage scenarios of the parts usually determine the required tolerance accuracy of the CNC machining parts. For example, creating parts that are not combined with other parts usually requires lower CNC milling accuracy. Considering how much it costs to achieve strict CNC machining parts tolerances, if you don't need it, please don't try.

 

 

 

Summarize                          

                

Regarding the tolerances of CNC machined parts, we have a series of ISO standard requirements. We will formulate according to the needs of customers, while meeting the needs, we can also provide high-quality surface treatment. We have multiple 5-axis, 4-axis, and 3-axis CNC machining machines. In terms of detection, we also have high-precision measuring instruments such as two-dimensional and three-dimensional. In addition, we also provide different CNC machining and manufacturing services for more than 60 corporate customers around the world. If you have any questions about the tolerances of CNC machined parts or want to know more about VMT's CNC machined parts service standard tolerances, please feel free to contact our CNC machining and manufacturing team.

 

 

 

 

 

Different product structures have different production and processing capabilities. Now each part can produce 12,000 pieces

CNC machining center: 90 sets; CNC lathe: 65 sets.

We have 2D coordinate measuring machine, 3D coordinate measuring machine, altimeter, caliper, micrometer, roughness meter, salt spray tester, CCD automatic tester, contour projector.

Linear tolerance range: within ±0.02mm; Angle tolerance range: ±1°; Roundness: within 0.005mm.

Generally it is caused by three reasons: (1)) The meshing gap of the transmission gear of the feed system is abnormal or damaged. (2) The gap between the pressure plates on the longitudinal sides of the large slide plate and the bed rail is too large. (3) The light bar is bent, and the coaxiality of the hole supporting the light bar and the light bar is out of tolerance or the bar is not parallel to the bed guide rail.

The reasons are: (1) The axial movement of the main shaft is large or the main shaft bearing is seriously worn. (2) The chuck flange and the E-axis are loosely matched, the bottom surface of the square tool post and the tool post slide plate are in poor contact, and the gap between the medium and small slide plates is too large.

It is often due to the following three reasons: (1) Poor lubrication, poor filtration of cutting fluid or improper selection. (2) The metallographic structure of the workpiece is not good. (3) The tool is poorly sharpened or the tool tip is higher than the axis of the workpiece.

(1) The tip of the turning tool is not aligned with the axis of the workpiece. (2) There is an error in the corner of the tool post or the offset of the tailstock.

There are mainly eight aspects: (1) Blank bending; (2) The front and back centers are unequal in height or center offset.;(3) Improper top tightening force; (4) The axis of the main shaft of the lathe and the guide surface of the bed are not parallel in the horizontal plane;(5) The distance between the tool tip and the support of the follower tool post is too large; (6) The clamping rigidity of the workpiece is not enough; (7) The tool is worn out or the tool shaft is too thin in one feed, causing the tool to be cut (hole alignment); (8) Deformation caused by turning stress and turning heat.

（1）The thread of the chuck flange and the spindle is loose or the chuck positioning surface is loose; (2) The workpiece hole wall is thin and the clamping deformation: (3) The spindle bearing clearance is large, and the clearance between the outer diameter of the spindle sleeve and the box hole is large, or The roundness of the main journal is out of tolerance.

There are several ways to press the tool: P is to clamp with the central cylindrical pin of the blade, and the clamping methods include lever type, eccentric type, etc. Moreover, the products provided by various tool vendors do not necessarily include all clamping methods, so please refer to product samples when choosing. Each clamping method is suitable for different forms of blades. For example, non-porous blades are commonly used for upward pressure (C type), and ceramic, cubic boron nitride and other blades are commonly used for this clamping method. The D and M models have reliable clamping and are suitable for occasions with large cutting forces, such as harsh processing conditions, rough machining of steel, and processing of short chips such as cast iron. P-type rake face is open, which is conducive to chip removal. Generally, medium and light cutting can be used. The S-type structure is simple and compact, and has no resistance to chip removal. It is a clamping method for counterbore inserts. It can be used with front inserts and is suitable for light cutting and small hole processing.

No kind of compression method is the most reasonable. It depends on the processing material and the occasion, and it must be combined with your company's inventory to meet the drawing requirements and save the cost of the tool is the most important.

Pay attention to the following points:

(1) Workpiece material and shape;

(2) Machine tool;

(3) Cutting edge related to the central axis of the part;

(4) Type of blade and chip breaker;

(5) Carbide grade and coating Layer;

(6) Other cutting conditions that affect tool life.

The cutting blade is determined by the size of the blade required by the drawing; and the cutting blade seat is determined by the fastening of the blade and the machine tool.

The rake angle can sharpen the cutting edge, make cutting more brisk, and reduce cutting force and cutting heat. However, if the rake angle is too large, the strength of the cutting edge and the cutting edge will decrease, and the heat conduction volume of the tool will decrease, which will affect the service life of the tool. The size of the rake angle also has a certain influence on the surface roughness, chip evacuation and chip breaking. The strength and hardness of the workpiece material is low, and the rake angle should be larger, and vice versa. Therefore, the rake angle will directly affect the surface roughness.

Automatic lathe, Citizen swiss-type, CNC lathe, 5-axis CNC machining.

Automatic lathe: ±0.01mm; Citizen swiss-type: ±0.005mm; CNC lathe: ±0.01mm.

Sample: 24 hours; Batch production: 6 working days

ISO9001 quality system and SGS On-site factory audit, machining patent certificate.