170M6813D

The 170M6813D,from Bussmann / Eaton,is Specialty Fuses.what we offer have competitive price in the global market,which are in original and new parts.If you would like to know more about the products or apply a lower price, please contact us through the “online chat” or send a quote to us!

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  • Package
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  • Contact US
Product Category :
Specialty Fuses
Manufacturer :
Bussmann / Eaton
Applications :
Electrical, Industrial
Approval Agency :
CE, UR
Breaking Capacity @ Rated Voltage :
200kA
Class :
Current Rating (Amps) :
900A
delivery time :
24 hours
Fuse Type :
Specialty Fuses
Mounting Type :
Holder
Package :
Bulk
Package / Case :
Rectangular, Blade
Part Status :
Active
Response Time :
Series :
170M Fuses
Size / Dimension :
2.677L x 2.992W x 3.465H (68.00mm x 76.00mm x 88.00mm)
Type :
HIGH SPEED FUSE
Voltage Rating – AC :
700V

>Qipao Traditional Chinese Dress

This Qipao Traditional Chinese Dress is perfect for your nights, and will distinguish you from the others. With its elegant bare back and flower motifs, this dress is a concentrate of chinese authenticity, elegance and refinement.

Details of the Qipao Traditional Chinese Dress

• Long Qipao Traditional Chinese Dress
• Unique design: Traditional Chinese style
• Discreet closure
• Materials: 70% Satin and 30% Polyester
• Hand wash cold for ideal preservation
• FREE STANDARD DELIVERY


The Future of Fashion: How Artificial Intelligence is Revolutionizing the Industry

The Future of Fashion: How Artificial Intelligence is Revolutionizing the Industry

In recent years, the fashion industry has witnessed a significant transformation, thanks to the integration of Artificial Intelligence (AI). This cutting-edge technology is not only reshaping the way designers create but also how consumers interact with fashion. From virtual try-ons to personalized recommendations, AI is at the forefront of this digital revolution.

AI in Design and Production

One of the most exciting applications of Artificial Intelligence in fashion is in the design and production process. AI-powered tools can analyze vast amounts of data to predict trends, optimize supply chains, and even create new designs. For instance, AI algorithms can sift through social media posts, runway shows, and sales data to identify emerging trends, allowing designers to stay ahead of the curve.

Virtual Try-Ons and Personalized Shopping

Another groundbreaking application of Artificial Intelligence is in the realm of virtual try-ons and personalized shopping experiences. AI-driven platforms can create 3D models of clothing items, enabling customers to see how a garment would look on them without ever stepping into a fitting room. This not only enhances the shopping experience but also reduces return rates, benefiting both consumers and retailers.

Sustainability and Ethical Fashion

AI is also playing a crucial role in promoting sustainability and ethical practices within the fashion industry. By analyzing production processes and material usage, AI can help brands minimize waste and reduce their environmental footprint. Additionally, AI can assist in ensuring fair labor practices by monitoring supply chains and identifying potential ethical violations.

Conclusion

The integration of Artificial Intelligence into the fashion industry is not just a trend; it’s a revolution. As AI continues to evolve, its impact on design, production, and consumer interaction will only grow. Brands that embrace this technology will be better positioned to meet the demands of the modern consumer, offering innovative, sustainable, and personalized fashion experiences.

For more insights into how AI is transforming the fashion industry, visit Style3D.

Leaders and experts of National Energy Group Ningxia Coal Co., Ltd. were invited to NXZ for technical exchange

In the afternoon of February 9, the leaders and experts of the mechanical and electrical management department, material procurement company and various departments of Ningxia Coal Mining Machinery Co., Ltd. of the National Energy Group were invited to NXZ for technical exchange. Li Changsheng, secretary of the Party Committee, chairman of the board of directors, general manager of the joint-stock company, and heads of all departments of the company attended the meeting.

Li Changsheng first welcomed the visiting leaders and experts, and briefly introduced the achievements of the company's reform and development. Li Hongbin, the chief engineer, summarized the company's R&D and manufacturing, industry performance, next R&D direction and cooperation advantages of both sides from the research and development situation of NXZ coal industry; Relevant leaders and experts of Ningxia Coal Industry Group have identified the areas of cooperation between the two sides and conducted detailed communication on the products concerned. Both sides agreed that they hoped to strengthen the technical marketing efforts and work together with Ningxia Coal Industry through this exchange.

After the symposium, leaders and experts from relevant departments and offices of Ningxia Coal Industry Group visited the rail transit railway workshop of NXZ for field investigation.

About NXZ

Founded in 1965, Xibei Bearing Co., Ltd. is one of the largest bearing manufacturers in western China and the first listed company in China's bearing industry. The "NXZ" brand held by it is a well-known trademark in China, and has obtained the national export inspection exemption qualification, and its products are sold well in more than 50 countries and regions.The company has a national-level enterprise technology center, a national and local joint engineering laboratory, and a post-doctoral research station; it has passed IS09001 and IS014001 quality management system certification, and is a national first-class measurement unit; Enterprises with military production qualifications and licenses.

NXZ is mainly engaged in the production and sales of various types of rolling bearings. The products are widely used in the main engine matching of petroleum, metallurgy, railway, mining, construction engineering, heavy-duty vehicles, motors, agricultural machinery and other industries. The company can produce more than 5,000 kinds of rolling bearings of various types with an outer diameter of 40 mm to 3500 mm in accordance with international standards and the latest national technical standards, and can produce various non-standard bearings and special structural bearings according to user requirements. The company has the right to import and export, and exports bearing products to more than 50 countries and regions.

In 1997, NXZ passed IS09001 quality system certification, IS014001 environmental management system certification and national GB/T19022-2003/ISO10012 perfect measurement system certification (AAA), and is a national first-level measurement unit. It has a national-level enterprise technology center, a post-doctoral research station and the only petroleum machinery bearing research institute in China's bearing industry. In 2008, the company won the honorary titles of "National Export Commodity Exemption Qualification", "Autonomous Region Petroleum R&D Innovation Team" and other honorary titles, and passed the "National High-tech Enterprise" certification.

Contact

Address:No.388, West Liupanshan Road, Yinchuan, Ningxia 750021, China

Tel:0086-951-2020454

Fax:0086-951-2020454

Contact Person:Jane Li

Email:[email protected],[email protected]

Web:http://en.nxz.com.cn/

2022 June CnBearing Expo top power transmission manufacturer recommendation:NingBo Fulong SYNCHRONOUS BELT

national clothing asian costume

We are pleased to announce China First&Top 1 timing belts
manufacturer CNFULO will attend 2022 June CnBearing Expo. If you are
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FULONG SYNCHRONOUS BELT ,just send email to [email protected]

The expo hall of CNFULO is https://www.bearingshow.net/expohallindex/NINGBO-FULONG-SYNCHRONOUS-BELT-COLTD/457.html

CNFULO main product:Timing
belts(rubble&PU),poly-v belts(PJ,PH,PK,PL,PM),V-belts,EPS&EPB
belts and pulleys for Industrial and Automotive with full ranges.

Application:Transmission for Industrial and Automotive

Special qualification:We have a Chinese National standard laboratory,and many patents.

About FULONG SYNCHRONOUS BELT:
We
are timing belt(with PU belt V-belt and pulley) manufacture more than
35 years,we have 2000㎡ warehouse in Mexico,and will been have Europe
warehouse in Germany&UK,and manufacture headquarter in China.OEM for
SKF,FENNER,GMB ect.

We have full range size of timing belts and PK belts,and almost all size for v-belts and PU belts.
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14 Benefits of CNC Machining and CNC Milling – 3ERP

Over the years, there have been many advances in manufacturing processes. The Fourth Industrial Revolution has led to one of these – CNC machining and milling. CNC stands for Computer Numerical Control. CNC machines perform computer numerical control machining, a precision manufacturing process involving core-programmed computer software.

The manufacturing industry, especially, benefits from CNC machining. Compared to manual machining, CNC technology improves efficiency and accuracy, makes production faster, and leads to safer and cheaper operations.

As you might expect, there are disadvantages as well. We’ll look at the advantages of CNC machines and some of its disadvantages so you can decide for yourself whether it’s something you’d like to take advantage of.

CNC Machining Overview

The CNC machining and CNC milling processes use a machine and tooling that’s controlled by a numerical software program. Computerized controls and cutting tools remove material from a workpiece during the CNC milling process. The result is a custom-designed part.

The CNC machine has a table that rotates or moves the workpiece in different planes. CNC milling machines convert a 3D Computer Aided Design or CAD model into a series of computer instructions. These dictate the action of the CNC machine and tooling and move the workpiece automatically.

CNC milling and machining is used in many industries, for example:

  • Automotive
  • Aerospace
  • Medical
  • Agriculture
  • Construction
  • Dental
  • Firearms
  • Electronics
  • Metalwork
  • Publishing
  • Production
  • Manufacturing
  • Transportation
  • Hospitality
  • Woodwork

Using this method, manufacturers can create precise made-to-order parts.

What are the Advantages of CNC Machines?

CNC machining has become very popular across a wide range of industries for many reasons. In many cases, CNC milling benefits offer manufacturers and machine shops so much more. And it has led to manual equipment being replaced.

Here are 14 advantages of CNC machines offer.

1. High Precision and Improved Accuracy

One of the most significant benefits of using CNC machining compared with manual operations is precision. It’s possible to create parts that meet precise specifications without the need for constant attention from a skilled operator.

With CNC milling, human error is eliminated because the machines rely on computer instructions for fabricating parts. However, there is still some control over the manufacturing process by the operator of the CNC machine.

The accuracy of the CNC milling project depends very heavily on the operator. It is down to the operator to control the operating environment and cutting tool calibration. They also need to recognize when the tooling is getting too dull and unable to create the optimum results when in contact with raw material. But overall the risk of human error is significantly reduced.

It’s relatively easy to achieve tolerances as small as 0.004 mm and create complex parts. However, it’s worth pointing out that not all CNC machines are created equal. Not all CNC machines are capable of creating high-precision parts.

Defense and aerospace industries rely on high-precision CNC machined parts. Being able to create such precise components according to specifications could save lives.

2. Endurance

Manual machining processes can only continue as long as there are skilled workers present to work the machines. The manufacturing process stops when workers take a break or go home at the end of their working day.

However, operating CNC machines for 24 hours a day, 365 days a year is one of the main advantages. It depends on the project’s design, but in many cases, the operator can program the machine’s computer and set it to create the required part as many times as necessary.

Because less human intervention is required than manual machining, fewer experienced engineers and skilled workers are needed. As a result, machine shops can increase their production capacity.

CNC machines also allow for quick production changes. If a small number of parts are required, the operator sets the machine for the small order. Once completed, they can change the CNC (Computer Numerical Control) program for the next production run. Such flexibility means a CNC machine shop can complete many orders, including individual prototypes and large batches of identical components.

CNC machine endurance is further improved by their need for minimal maintenance. Looking to the future, Internet of Things (IoT) technology could mean that CNC machines use sensors to keep track of the level of wear on various parts. When wear is detected, the sensors send signals to the operator. For the operator, this means they don’t have to wait for the machine to break down before they do something.

It’s also possible that the IoT could integrate CNC machines with other technology, particularly robots. The removal and packing of the finished product could be taken out of human hands entirely.

3. High Production and Scalability

After the operator has programmed the machine with the necessary design specifications, production can take place. Once the CNC machine has started a production run, creating parts takes no time at all.

As well as producing large numbers of parts, modern-day CNC machines are also very scalable. What makes them different from conventional machines and manual production processes is that a CNC machine can be programmed to produce one single item or large quantities. There are no limitations to the number of parts you can manufacture, allowing companies to use their resources and finances more efficiently.

4. Speed

Another of the numerous advantages CNC machining offers is its higher speed. When CNC machines are used, operators can be much more efficient because the machines can use their fastest settings. CNC machines can run 24/7 without running out of steam. They don’t need a break for coffee or lunch. No holidays need to be booked or any kind of time off. There are no trade-offs with a CNC machine.

Such benefits, together with the ability to maintain a high degree of accuracy and minimal waste of material resources, make CNC machining and milling one of the best ways to ensure production is efficient, fast, and scalable with a lower cost liability.

When more conventional milling methods are used, an operator is often required to manually operate the machine and change tooling depending on the cutting operation needed. This can be exceedingly time-consuming and inefficient.

5. Enhanced Capabilities

A CNC machine usually has a rotating carousel that can carry up to 30 tools. These tools can be automatically swapped out during the milling and machining process.

CNC milling machines with sophisticated design software produce complex shapes that a regular manual machine cannot duplicate.

CNC machines are much more efficient than any engineer, no matter how skilled or experienced. With the right software, a CNC machine can produce a workpiece of virtually any size, shape, or texture.

6. Capable of producing even the most complex parts

The CNC machining process can create virtually any component you might think of. These machines can perform a wealth of fabrication and CNC milling operations, including shearing, flame cutting, punching holes, and welding metal sheets.

Because of their incredible precision, CNC machines can be used to produce shapes of extreme complexity.

7. Wide Range of Materials Supported

CNC machines are compatible with a range of materials such as composites, metals, carving foam, rigid foam, phenolic materials, and plastics.

Regarding material selection for CNC milling, factors such as design tolerance, fastening, hardness, stress resistance, and heat tolerance must be taken into account when choosing.

8. Less Dependability on Human Labor and Fewer Human Errors

CNC machines are precision turning machines that operate autonomously. No manual intervention is required, which bypasses the possibility of human errors.

Software programs and codes govern the end-to-end CNC machining process, and the machines can deliver flawless complex designs with great accuracy.

9. Uniform Product and Design Retention

The input is immutable throughout the production process, no matter how many cycles are performed. Unless any changes are made deliberately, the final products are consistent.

10. Digital Simulations of Prototypes

Simulations of prototypes are possible using CNC machining and milling. This allows manufacturers to check the program’s efficacy before it is put into full-time production mode.

11. Lower Costs

The initial price of a CNC machine may be costly but lower operational costs more than compensate for this. The high output rate, minimal mistakes, and low production costs of CNC machining make it cost-effective. Less training is required, which is a further cost saving. Operators can also learn how to use CNC machines virtually, eliminating the cost and need for training workpieces. All these factors make CNC machining very attractive.

12. Improved Safety

An operator only interacts with a CNC machine to enter the code and maintain the machine. Apart from that, the process is entirely automated. Operators don’t have to put themselves near the cutting tools, which can improve the overall safety of the workplace.

Introducing CNC machines into manufacturing has led to fewer occupational health and safety accidents. While a CNC machine may not be as simple to operate as a cordless drill, for an operator with some training and practice, they are relatively simple to use.

13. Low Maintenance

The final point in the list of the many advantages of CNC milling machine technology is that it typically requires minimal levels of maintenance. Generally, the service involves changing the cutting implements at the indicated interval and a small amount of light cleaning. CNC machines are low maintenance, and any servicing can be performed in-house without needing professional maintenance engineers, which saves money.

14. Full Mobility Will Hit The CNC Industry

Just as an individual can now access the internet no matter where they might be, soon the potential for a completely mobile CNC machine will become a reality.

Currently, some CNC machines can be used at home to cut wood, plastic, and metal while sitting on a tabletop. In manufacturing facilities, CNC machines provide the ability to fully automate the process to address a complex project.

What are the Disadvantages of a CNC Milling Machine?

As you might expect, alongside the advantages of CNC machining, there are a few disadvantages that it’s only fair to mention.

Cost

CNC machines tend to be more expensive and require a more substantial initial investment than manual machines. However, as these machines become more widely available and used, supplies will increase, and costs will go down.

Skills Loss and Unemployment

An element of skills loss comes with the increased use of CNC machines. Fewer manual machine operators are required, resulting in new students not being trained in these skills. Eventually, it could result in a total loss of traditional manual machining and milling skills.

Not Enough Qualified Technicians

While the machining process is automated, on the whole, highly trained technicians or experienced engineers are still required to program the machines, make calculations, and supervise the machining process.

Not all machine shops can find these highly trained operators to run the machines, which might result in low-quality machined parts.

Increased Material Wastage

CNC machining is a subtractive manufacturing method. The process starts with a block of material from which portions are cut away until the finished product is left. The result is greater material wastage than produced by additive manufacturing processes like 3D printing.

Is CNC Machining Better Than Conventional Machining?

As you can see, there are lots of CNC machining advantages. If you’re considering adding CNC machines to your manufacturing process, here are some of the reasons you may or may not want to:

  • CNC machining services require no extensive skills or experience
  • Products can be replicated thousands of times
  • Less labor is required to operate CNC machinery
  • CNC software makes your production options more versatile
  • With CNC machines, there is no need for prototypes
  • CNC machining fits the skills of modern workers
  • CNC machining uses oil-based coolants that result in a better quality finish
  • CNC machining services create lighter and stronger parts with the help of complex geometry

There are many CNC machining advantages compared with conventional machining. These include greater design freedom, higher accuracy, and finer features.

Conclusion

CNC machining is a form of manufacturing that uses computer-controlled machine tools to create parts and products. The main advantages of CNC machining over traditional methods are greater accuracy, more precise control, and higher efficiency.

Precision-turned components milled by CNC machines are of higher quality than those from manually operated machines. In addition, CNC machining offers other advantages that will give a company a competitive edge and help it stay ahead of the competition.

Thanks to these advantages, CNC machining is suitable for a wide range of applications across many industries.

3ERP provides cutting-edge CNC machining services that boost your company’s potential and support its continuous development. From a single project to one that requires hundreds or thousands of parts, 3ERP specializes in quick delivery in as few as 10 days. Precise, accurate, fast, and affordable – try 3ERP today and see how we make your ideas a reality. Contact us today for more details.

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Keyword: sfp-ge-l

How 3D printed lattice structures can improve parts

3D printed lattice structures are one of the biggest selling points of additive manufacturing. They are easy to fabricate using the unique process of 3D printing, and there are many practical benefits to using them.

Lattice structures are essentially infill patterns — ways of structuring the internal geometry of a 3D printed part. Instead of 3D printing a solid block of plastic or metal, engineers can use overlapping, interlocking patterns that are partially hollow. When these lattices are designed properly, they can greatly improve the mechanical properties of a part, making it lighter and stronger.

Importantly, lattice structures can be fabricated on any professional-grade 3D printer. And more importantly still, these structures cannot be adequately produced using any other manufacturing technology. Subtractive technologies cannot cut the inside of a part without cutting through the outside, while molds simply get “filled up” with liquid material — you can’t pick and choose how that liquid material falls into place like you can with a 3D printer.

This article looks at how 3D printed lattice structures are made, and why they’re becoming so useful in places like the aerospace industry.

How do you make a 3D printed lattice?

Lattice structures can be seen everywhere in places like bridges and timber houses. The Eiffel Tower is perhaps the world’s most famous example of a lattice or truss structure, with its overlapping beams forming a stable but largely hollow structure.

It is possible to replicate such a structure in a 3D printed part. And it is generally not necessary to design the lattice framework manually: several lattice generation tools exist which automatically generate lattice patterns based on parameters chosen by the user. Commercially available tools include topology, Autodesk Within, and Meshify.

But not all lattices are the same. In fact, lattice structures vary in many ways, with the key variations described below.

Cell structure

Cells are the individual units that make up a lattice structure. These are usually recognizable as geometric shapes such as cubes, stars, hexagons, octagons, etc., although multiple shapes can be combined for specific mechanical uses. Sometimes the cells are entirely non-uniform, with no discernible pattern.

Ultimately, the cell structure — both its shape and size — affects how a part will behave in terms of strength, weight, elasticity and other factors.

Cell orientation

Deciding on the structure and size of the cell is only half the story. The shapes within a lattice can be oriented in different ways, which also affects the ultimate performance of the part. Orientation should also be determined by printing constraints: certain orientations will require more support structures, for example.

Lattice material

Not all materials are capable of printing all lattice structures. Soft and elastic materials should generally not be printed with large cell structures, since the large porous sections may make the part sag. In most cases, the lattice material will be the same as the shell or external material, but multi-extruder printers offer some flexibility in this regard.

What are the benefits of a 3D printed lattice?

By incorporating lattice structures into 3D printed parts, engineers can reap benefits such as weight reduction, improved part strength and shock absorption.

Weight reduction is perhaps the most important of those benefits and the main reason why engineers are so keen to optimize their printed structures with patterned internal geometries. A key feature of lattice structures is their partial hollowness: cells contain empty space, so apart with an internal lattice pattern features less overall material than an equivalent part with solid infill.

Less overall material means less mass, which is a huge advantage for AM users in industries like automotive and aerospace, where shaving off just a few grams can make a huge difference to part performance. In fact, some of the most exciting lattice research is taking place in aerospace, where companies like Boeing have developed super-lightweight advanced lattice materials.

Less material also means less expenditure. By creating parts with lattice structures, engineers can create superior parts that actually cost less than inferior ones.

But the whole point of lattice structures is to reduce mass without compromising the integrity of the part. While poking arbitrary holes in a part could make it more brittle and more likely to break, 3D printed lattice structures are designed to use the material in the most structurally effective way possible, ensuring the hollow sections are not vulnerabilities, but strengths in themselves.

Partially hollow parts with lattice structures can actually be stronger than their solid equivalents, because the empty spaces in a lattice serve to improve shock absorption and reduce impact stress. Parts with large-cell lattice structures can be highly flexible and elastic, reducing brittleness and possibility of breakage.

Less important but still notable are the aesthetics of lattices. These complex patterns are some of the most impressive forms that engineers can make with a 3D printer, so parts with printed lattices are often as visually arresting as they are practical.

Benefits of 3D printed lattices summary:

  • Lightweight
  • Less material usage
  • Strong
  • Shock-absorbing
  • Aesthetic

Can CNC machines make lattice structures?

In short, no. CNC machines and other subtractive manufacturing technologies cannot make 3D lattice structures because they use cutting tools to remove material from a solid block. A CNC machine could cut away the hollow sections of the first row of lattice cells, but the cutting tool would then hit a dead end. It cannot cut the next row of hollow sections because the solid sections are in the way.

A 3D printer does not encounter this problem because it fabricates parts in slices or cross-sections, building them up from nothing rather than cutting them down from a solid block. Additive manufacturing is therefore far and away from the best manufacturing technology for creating lattice structures.

Note, however, that CNC machines can effectively create 2D lattice structures such as grilles, and these specific CNC machined lattices may, in fact, be stronger than 3D printed lattices.

What are the practical applications of 3D printed lattices?

3D printed lattice structures already have applications in many industries, since engineers and product designers across the commercial spectrum are constantly seeking ways to lightweight and strengthen parts.

Weight reduction is especially important in the aerospace and automotive industries since heavy parts generally reduce vehicle speed and lead to greater fuel usage. Lightweight parts are therefore far more desirable.

Given that truss structures have existed in architecture for hundreds of years, it’s no surprise that miniaturized versions of lattices are also becoming popular in today’s architecture landscape. And because lattice structures can be precisely engineered, researchers have even found ways to create 3D patterns that reduce noise, potentially improving insulating materials for buildings.

3D printed lattices are also found in clothing and footwear, with companies like Adidas using 3D printed elastomer lattices for sneaker midsoles. These lattices provide a lightweight cushion with a huge amount of bounce — far better and more scientifically justifiable than the ubiquitous “air bubbles” of the 1990s.

3D printed lattices with 3ERP

3ERP is an experienced provider of 3D printed parts and prototypes, and we are capable of producing high-quality lattice parts for a variety of applications.

Our additive manufacturing services include FDM, SLA, SLS and SLM, all of which can be utilized to create complex internal geometries.

Get in touch for a fast quote.

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Machining Tolerances 101: Understanding the Basics, Types, and Importance of Machining Tolerance

During the early stages of the first industrial revolution, there was no standard for fabricating machine parts. That meant every machine or manufactured product had its custom design and was built in a “one-off” production style. Although this method allowed manufacturers to achieve dimensional accuracy, it caused long lead times.

Towards the end of the first industrial revolution, Eli Whitney (the cotton gin inventor) figured out how to manufacture several muskets so that they were interchangeable ㅡ which means the muskets were identical and he could substitute them for one another. His manufacturing approach showed how components of an assembly should be manufactured to certain standard machining tolerance.

But what exactly is machining tolerance, and how does it work? This article answers all of these and more.

What is Tolerance in Machining?

Tolerance is simply a measure of acceptable variation (or deviation) in the dimension of your part. Simply put, machining tolerance allows you to specify a part’s maximum and minimum dimensional limit. It is typically expressed using “±” (pronounced plus or minus) and accompanied by an acceptable deviation (for example, ±0.05).

To better understand tolerances, consider a scenario where you’re looking to manufacture a shaft that will be coupled to a bearing, as shown in Figure 1.

Figure 1: A shaft and bearing coupling

Suppose the bearing has a diameter of 30 mm. In such a scenario, you’d agree that a shaft manufactured to have a 30 mm diameter (or greater) might be challenging to fit into the bearing. Likewise, a shaft with a diameter of 27 mm will be too loose for the bearing.

Machining tolerances allow you to specify acceptable deviation in your part’s dimension to ease assembly. So, for instance, you can specify a shaft dimension of 29 ± 0.05 mm when manufacturing your shaft. This dimension would indicate that a shaft diameter between 28.95 mm and 29.05 mm would be satisfactory for the shaft-bearing assembly.

Types of Tolerances

#1 Unilateral Tolerance

Unilateral tolerance is a type of tolerance that allows variation from the nominal (or true) dimension only in one direction (positive or negative). An example of such tolerance is shown in Figure 2. This drawing illustrates unilateral tolerance using a shaft with a diameter of 153.65 (+2.52/-0.00) mm.

Figure 2: Unilateral tolerance

It tells manufacturers that the finished shaft diameter must be at least 153.65 mm and at most 156.17 mm ㅡ which is a sum of 153.65 mm and 2.52 mm.

Learn more: What is a Unilateral Tolerance?

#2 Bilateral Tolerances

Unlike unilateral machining tolerance, bilateral tolerances allow variation from the nominal dimension in the positive and negative directions. An example of such tolerance is shown in Figure 3, where we have a hole with a diameter of 102.00 ±0.10 mm.

Figure 3: Bilateral tolerance

Notice how this tolerance allows equal variation from the nominal value in both directions. So, suppose your manufacturer fabricates a hole with a diameter ranging between 101.90 mm and 102.10 mm. In such a scenario, it won’t affect your part’s function.

You should opt for bilateral tolerances if you’re looking to mass-produce exterior parts since it eliminates the possibility of costly errors that would render your finished products useless.

Learn more: Unilateral vs. Bilateral Tolerance

#3 Limit Tolerance

As its name implies, limit tolerance is a type of tolerance that expresses the limit (or extreme) possible values of a part. For instance, Figure 4 illustrates the limit machining tolerance. And it tells manufacturers that the machined part (or final product) is satisfactory as long as the shaft dimension falls between 99.50 mm (lower limit) and 101.80 mm (upper limit).

Figure 4: Limit tolerance

#4 Standard Machining Tolerances

Standard tolerances are the most widely used machining tolerances for most fabricated parts today. These tolerances typically fall within the range of ±0.005” and ±0.030”, and machinists usually apply them when customers do not specify tolerance levels.

For instance, Table 1 shows the standard tolerances for different manufacturing processes:

These tolerance values are set by several international standards bodies (like ASME and ANSI). They are ideal when you’re looking to fabricate simple parts (or part features) like pipes, threads, and pins. However, for more complex part features, you might want to specify tolerances and requirements using the Geometric Dimensioning and Tolerancing (GD&T) standard.

Understanding Geometric Dimensioning and Tolerancing (GD&T)

Geometric Dimensioning and Tolerancing (GD&T) provides a higher level of quality control compared to other machining tolerances. For instance, it allows you to specify unique geometric characteristics like the true position of a feature, a part’s flatness, perpendicularity, parallelism, and concentricity.

Figure 5 shows the 2D computer-aided design (CAD) drawing of a part with GD&T. Notice how this drawing and machining tolerance provides helpful information about how certain surfaces should be parallel and perpendicular to other surfaces.

Figure 5: Geometric Dimensioning and Tolerancing

GD&T is a staple of design and manufacturing, and you’ll find top-tier product designers using this tolerancing approach with the other tolerance types for their product design. This combination of machining tolerance methods allows you to communicate your design intent precisely. It also reduces the need to explain complex requirements, especially if you’re looking to outsource manufacturing to a machine shop abroad.

Figure 6: Exploded view and assembled view of an induction motor featuring several parts with different tolerance requirements

 

Manufacturing with Gensun

Machining tolerance is essential when you’re designing parts you want to manufacture. However, the success of your manufacturing project also depends on the machine shop you decide to work with.

Gensun Precision Machining is a leading provider of manufacturing services across Asia. We have a team of highly qualified machinists, engineers, and quality control experts who work together to understand your design and tolerance requirements before getting your product done right.

Learn more about our high-quality CNC machining and 3D printing (or additive manufacturing) services.

Keyword: mpo-12

How to install expansion screws

Expansion screws are used very frequently in our daily life and can be used to tighten a wide variety of tools. But if some people can not be used correctly, do not understand the correct operating procedures, it will lead to the fastening effect is not the best. How to install expansion screws? The expansion screw can be expanded during installation, thus increasing the grip strength of the screw, so as to play a fixed role. So how do you get the expansion screw out? Here is an introduction to the installation and use of expansion screws. Let’s take a look.

The first step is to choose the drill bit that fits the expansion screw, and to drill holes in the wall that are the same depth as the length of the bolt. Then the expansion screw the entire kit buried into the hole, this time do not rush to screw off the nut, or later it is not good to take out.

The next step is to tighten the nut. When you feel the screw tight, there will be no loosening. Then, we will unscrew the nut. Then the fixed items on the hole fixed pieces, to align the screw to install, and finally tighten the nut on it.

During the whole installation process, the holes are also very skilful. If the size is 6 mm, the diameter of the hole needs to reach 10 mm. If it is 8 mm in diameter, it needs to be hit to 12 mm, so it is necessary to punch holes in the wall according to the outer diameter of the expansion tube.

If it is a brick wall, you can choose a slightly smaller diameter drill, and the expansion pipe should be fully buried into the wall, it will be more solid.

When installing, must ensure that the hard wall or in the object on the hole, if the wall itself is relatively soft, is not appropriate, especially in the wall of the gap.


Post time: Oct-08-2022