Why Ball screw will always be more expensive? Nearly 80% user will consider the price.

That’s easy – there are more parts. A lead screw is merely a threaded shaft and simple nut. The precision of such a device is based on the grind accuracy for the shaft and the resultant play when the nut is installed. The ball screw material is better and have special treatment. There is also have high requirement for the ballscrew precision. Usually the C7 grade can meet most need. For more precision machine C5 grade is will be requested.

What precision ball screws can we provide?

ARESWIN can supply the ball screw with nut C7 and C5 Grade,we provide the TAIWAN TBI,GTEN brand and made in China brand ballscrew, can meet different budget of clients need. We can machining the ends of screw base on the clients drawing.
We will recommend you the following type of  TBI ball screw,they can meet most needs,but price is cheaper.

TBI sfu ball screw supply

SFU type ball screw is flange type ball screw,widely used in 3D printer,CNC machine and robot industry. This type ball screw is normal type and price is cheap and easy to exchange the ball nut.

SFU1605 ballscrew diameter is 16mm and also have other type diameter,max length can reach 4 meters and the length can be customized.Cold rolling screw rod. We can supply TBI brand(made in Taiwan),which have the best quality. Also the made in China SFU1605 ball screw can meet the client need in most industrial machines.TBI brand ball screw have best perfotmance.


sfk ball screwThe SFK Serie of ball screw is a Miniature Ball screw serie with flange nut in diameter 8 -10mm, in Grade C7. This ball screw serie is always P1 clearance quality, with no axial play.






TBI MOTION Ball Screw SFV Series


The SFV Serie of ball screw has a single flange nut. It is made in Grade C7. This type of ballscrew is suitable for pressing applications or heavy load movements.




Double standard ball nuts DFU are perfect choice for applications where high durability, positioning accuracy and smooth operation is required. All nuts are axial play free with 0-2% preload which reflect in high rigidity. Preload can be adjusted on the nut. Ball nuts and screws has to be from the same producer! Every nut is tested to fit perfectly to the ball screw.

ball screw ofu dfu tbi

We can also supply the T type screw, the T type screw have cheap price and have big different with ball screw.

1.Ball screw: It has the characteristics of high precision, reversibility and high efficiency. Because of its small friction resistance, ballscrew is widely used in various industrial equipment and precision instruments.

2.Trapezoidal screw: A product with high efficiency, low cost, and low machining accuracy, whose structure design ideas and schemes are worth popularizing and applying.
The Trapezoidal screw have usually screw material is stainless and the nut is brass, wildly used in 3d printer and robot industry. The thread have left type and right type, and left and right in one screw. Usually, it no need to machining the ends of screw, in this way, the machining cost will no need and cost will be cheaper.

Meanwhile, the material type is cheaper than the ball screw raw material.The diameter have T8,T12,T6 type,which have a diameter 8mm,12mm,6mm. The pitch also have different types, pitch have 2-8mm, and lead can be 2 -12mm. The length also can be adjust,from 20mm to 2000mm.
The Trapezoidal screw price is cheaper than the ball screw, if you machine no need the high precision, T type screw is a good choice. It is easy assemble and wiely used also.
All in all, the price of ballscrew is expensive, but the it have best performance. The user can choose different types base on the need, ARESWIN will provide the solution for our clients need.We will provide techincal support and welcome inquiry us.

Constant Section Thin Walled Bearing

The Constant Section Thin Walled Bearing is a kind of bearing even if the shaft diameter and bearing bore are larger, the cross-section of the thin-walled bearings will remain unchanged, so they are also called equal-section thin-walled bearings.Thin-walled equi-section bearings, also called thin-walled ring bearings, have high precision, very quiet and strong bearing capacity. Thin-walled ring bearings can be deep groove ball bearings, four point contact bearings, angular contact ball bearings, thin-walled uniform section bearings cross section is mostly square.

Ultra-thin Wall Bearing With Equal Cross Section which is a thin-walled bearing composed of seven open series and five sealed series. There are three types of open series: radial contact, angular contact and point contact.


Thin-wall bearing realizes thin bearing section, and also realizes miniaturization and light weight of products. The diversity of products expands its application range.

Thin-wall bearing producibility:

In order to obtain low friction torque, high rigidity and good rotation accuracy of the bearing, steel balls with small outer diameters are used.The use of hollow shaft ensures light weight and wiring space. Thin-wall 6700 and 6800 series have all kinds of dust cover forms, flanged forms, stainless steel forms, wide forms, etc., all of which are of the same variety.

Main Applications:

Stepping motors, medical instruments, office instruments, testing instruments and speed reduction. Variable speed device, robot, optics,Imaging device, rotary encoder.


Product Description:

SGR series double-axis slide rail: the slide rail with U-shaped cross section is adopted, and the inner side of the slide rail is provided with an axis rail, and the slide block is arranged in the linear guide rail of its internal test structure.

SGR Double-Axis Guide Rail Advantages

1.Adjustable pressure:”zero” interval standard

2.Lower sensitive style of dust

3.Grind surface to install rail

4.We can change the length of round linear guide according to your requirements.

5.Quality quarante for accuracy and repetition

6.Guide rail or slide board and wheel can added according to the needs of customers

7.Higher speed noise volume

8.Higher speed target

Material: basically made of high quality aluminum alloy with oxidation treatment on surface, the optical axis is with chrome plated treatment on surface.


Built-in Double Axis Linear Guideway Model NO.As Below:

(1) SGR10    SGB10-3UU / SGB10-4UU/  SGB10-5UU

(2) SGR15    SGB15-3UU / SGB15-4UU / SGB15-5UU

(3) SGR15N  SGB15N-3UU / SGB15N-4UU / SGB15N-5UU

(4) SGR20     SGB20-3UU / SGB20-4UU / SGB20-5UU

(5) SGR20N   SGB20N-3UU / SGB20N-4UU / SGB20N-5UU

(6) SGR25     SGB25-3UU / SGB25-4UU / SGB25-5UU

(7) SGR35     SGB35-3UU / SGB35-4UU / SGB35-5UU

The Product Specifications:

Guide rail length: the MAX length of the whole rail is 4000mm, and docking can be carried out if the length exceeds 4000mm; Any length can be cut as required, and different specifications and prices are different.

Application area:

Built-in SGR and external LGD, two kinds of double-axis roller linear guides, belong to linear motion transmission products, which are widely used in precision machinery, flame cutting machine, computer engraving machine, fitness equipment, printing machinery, packaging machinery, textile machinery automatic production line and other machinery and supporting equipment.

linear module sliding table

The linear module sliding table is an important auxiliary equipment that many automation equipments need to use. The common automation equipments used in linear modules are: printing press, soldering machine, mechanical arm, etc.

So, what aspects should we pay attention to when purchasing the linear module sliding table?

The following three points should be noted:

1. Load

Linear modules usually need a certain amount of load, that is, how much weight the modules need to load. At present, many linear module manufacturers can offer products with various loads, and the factory must choose the linear module according to the actual load weight in the production process, otherwise, the load of the linear module will be insufficient, which will lead to problems in the product assembly line.

2. Stroke accuracy

Linear module manufacturers with abundant supply will provide many linear modules with different effective stroke specifications. Effective stroke refers to how long the interval demand of linear modules moves from one end to the other, which is also related to the basic requirement of which products the factory can use linear modules. The movement accuracy also needs the factory to choose according to the products, so the effective stroke movement accuracy is the factor that determines the linear module specifications when selecting the products of linear module manufacturers.

3. Configuration

The selection of linear modules should also proceed from the configuration point of view, such as the brand specifications of screw rods, guide rails, timing belts, switches, etc. The products of linear module manufacturers also have certain differences in configuration. When selecting, the configuration of linear modules should be determined according to the requirements of precision and other aspects when producing products.

What is the difference between ball screw and trapezoidal screw?

6. Different axial clearance and preloading methods.

Axial clearance is also a very important factor to consider when selecting lead screw, because the existence of clearance will lead to return error, which directly affects the accuracy of reverse operation. Ball screws are divided into different grades according to the gap. For example, THK is divided into G0(0 and preload), G1(0-0.005), GT(0-0.01), G2(0-0.02) and G3(0-0.05), and the axial clearance increases in turn. NSK is also divided into five grades, namely Z(0 and preload), T(0-0.005), S(0-0.02), N(0-0.05) and L(0-0.3). The values in brackets indicate the range of axial clearance in millimeters. For trapezoidal lead screw, Thomson shows that the axial clearance is between 0.02 mm and 0.25 mm. In order to eliminate the axial clearance between the nut and the screw shaft and improve the transmission accuracy, both ball screw and trapezoidal screw can increase the preload. However, the preloading methods are different. For example, THK and NSK ball screws use nut phase difference for a single nut, while for a double nut, they use pre-compression gaskets or spring plates for pre-compression. On the whole, the axial clearance is smaller for ball screws, and the preloading method is more for ball screws, because the current preloading methods for trapezoidal screws belong to constant pressure preloading method, while ball screws are two types: positioning preloading and constant pressure preloading.

7. Different calculation methods.

When calculating the ball screw, it is necessary to consider the basic conditions such as precision, speed and load required by the system. In which, constant speed torque: T1=(Ta+Tpmax+Tu)/i .. I= the number of teeth on the lead screw side N2/ the number of teeth on the motor side N1, indicating the reduction ratio. Generally, trapezoidal screw only needs a formula, T1=FP/2πη, because trapezoidal screw is suitable for low-speed applications, and there are no problems such as high-speed round trip and high acceleration and deceleration.

8. Structural design of nut decoupling.

When the lead screw is long, the nut is subjected to axial deflection torque or the nut is subjected to axial load, the lead screw shaft inclines or deforms along the radial direction, which may cause uneven stress, jam and vibration, which may lead to increased wear and affect the accuracy.

9. Differences in applications.

Trapezoidal screw is sliding friction, too high speed will produce high heat on the joint surface, which will lead to increased wear. Therefore, trapezoidal lead screw is suitable for applications with light weight and low speed requirement. At the same time, trapezoidal lead screw, because of its low precision, is often more suitable for applications that do not require high precision, such as slow transfer and handling. Ball screw, with low heat and high precision, is usually more suitable for applications requiring smooth motion, high efficiency, high precision and long-time continuous or high-speed motion, such as semiconductor equipment.

10. Example of calculation and selection of ball screw.

Finally, how to choose the ball screw according to the conditions of precision, speed, load and service life? “How to choose ball screw”, contact us and we will share it with you.

What is the difference between ball screw and trapezoidal screw?

When to use ball screw, When to use trapezoidal screw?

How to select ball screw (or trapezoidal screw) and motor according to the requirements of precision, speed and load?

What are the common forms of supporting structures at both ends? (fixed-supported)

What is the structural design of nut decoupling at long stroke?

Let’s look at the difference between ball screw and trapezoidal screw with these questions, and explain it roughly from the following 10 aspects.

1. Different structures.

The movement principle of trapezoidal screw and ball screw is the same, but the difference is that there is no ball in trapezoidal screw, so the movement between nut and screw shaft depends entirely on mechanical contact to produce sliding, which is sliding friction, so trapezoidal screw is also called sliding screw.

Therefore, the structural difference between the two is summarized in one sentence: the ball screw is rolling friction and the trapezoidal screw is sliding friction.

2. Different transmission efficiency.

For example, NSK and THK show that the friction coefficient of ball screw is between 0.003 and 0.01, while that of trapezoidal screw is between 0.1 and 0.2.

For example, REXROTH shows that the friction coefficient of ball screw is between 0.005 and 0.01, while that of trapezoidal screw is between 0.2 and 0.3.

This is why the transmission efficiency of most ball screws is as high as 90%, and some even reach more than 95%, while the transmission efficiency of most trapezoidal screws is lower than 70%. trapezoidal screw is not suitable for high-speed operation, and its maximum speed is generally not more than 3000RPM. And the ball screw, because it is rolling friction, does not generate so much heat, and its speed can reach very high, such as 10000RPM. The efficiency of ball screw is 2-4 times that of trapezoidal screw, so generally speaking, when the same lead is used to drive the same load, ball screw has more advantages.

3. Different self-locking

Theory shows that when the transmission efficiency of screw is greater than 50%, there is no self-locking, and when the transmission efficiency is less than 35%, there is self-locking. Therefore, ball screw has no self-locking, while trapezoidal screw has certain self-locking.

The trapezoidal screw shaft is also made of stainless steel or alloy steel. As for the nut, it is a little different from the ball screw. In many cases, the trapezoidal screw nut will use nonmetallic materials.

4. Different materials

The ball screw shaft is generally made of stainless steel or alloy steel, while the nut is generally made of copper, because copper can bear a large load and has a small friction coefficient, which has a certain self-lubricating effect. Just like some common linear bearing or plane skateboards, copper is also used, which is precisely the reason.

The trapezoidal screw shaft is also made of stainless steel or alloy steel. As for the nut, it is a little different from the ball screw. In many cases, the trapezoidal screw nut will use nonmetallic materials.

5. Different manufacturing methods and final precision

Generally, there are two processing methods for ball screws, one is grinding and the other is tying. The general precision of rolling ball screw is C7 C7(±50um/300mm), C8 C8(±100um/300mm) and C10 C10(±210um/300mm).C0-C5 belong to grinding grade screws, and the highest precision of grinding ball screws can reach C0 grade, that is, 3 um/100mm, and even ball screws with low grade C5 can achieve the precision of ±18um/100mm. Usually C5 and C3 (such as TBI and GTEN brands).

Trapezoidal screw has three manufacturing methods: rolling, cutting and grinding.

It is better than cutting, because rolling can get a harder surface with superior surface finish. However, as far as precision is concerned, grinding can obtain the highest precision, followed by cutting, and rolling can obtain the lowest precision.

For other differences, please see the next article.

What is the reason for the blackening of the coupling?

The coupling is used to connect the two shafts together. The two shafts cannot be separated when the machine is running. The two shafts can only be separated after the machine is stopped and the connection is disconnected. Do you know what are the classifications of couplings?

Let’s follow the editor to find out:

1. Rigid coupling: It can only transmit motion and torque, without other functions.

2. Coupling: It can transmit motion and torque, overload* protection, in addition, it also has different degrees of compensation performance, such as pin type, friction type, magnetic powder type, centrifugal type, hydraulic type and other couplings .

3. Flexible coupling: A flexible coupling without elastic elements can not only transmit motion and torque, but also have different degrees of axial, radial and angular compensation performance, including gear couplings, universal Toward couplings, chain couplings, slider couplings, etc.

4. Flexible coupling with elastic elements: it can transmit motion and torque; it has different degrees of axial, radial and angular compensation performance; it also has different degrees of damping and buffering effects to improve the work of the transmission system Performance, including flexible couplings with various non-metal elastic elements and flexible couplings with metal elastic elements. The structure of various elastic couplings is different, and the difference is large, and the role in the transmission system is also different.

The speed of the working coupling is high and low. For the two-shaft connection that needs high-speed operation, the structure of the coupling should be considered to have high balance accuracy characteristics to eliminate vibration and noise caused by centrifugal force, and increase the relevant drum-shaped gear coupling The abrasion and heat of the motor reduce the transmission quality and service life. Among them, the diaphragm coupling has better adaptability to high-speed operation.

The shaft system connected by the coupling and its operation. For the connection shaft system with large mass and large moment of inertia, and frequent starting, shifting or reversing, you should consider choosing a spring-elastic pin coupling that can withstand large instantaneous overloads and can buffer and absorb vibration.

When the entire diaphragm coupling enters some sending liquids, first of all, they may cause a series of corrosion to acidic objects, and may cause some dissolution of metals, or they may have various effects on some other ions. A different kind of displacement reaction. Then in this case, some of the original particles can replace each other and deposit on the metal surface, because some oxidants are added to the solution itself, so some different ions in the nitrite are reduced. This can effectively promote a series of oxidation reactions or other chemical reactions on their metal surfaces.

From what aspects to choose linear guide?

When choosing the linear guide rail of linear module, we should choose the appropriate size according to the working environment, and choose the appropriate product while ensuring the accuracy. Besides, the correct installation and lubrication protection of the guide rail are also very important.

1. High guiding accuracy: the guiding accuracy refers to the linearity of moving parts along the guide rail and the accuracy of the relative positions between the base surfaces.

2. High enough rigidity: The external force on the moving parts is borne by the guide rail surface, so the guide rail should have high enough rigidity. Therefore, we often increase the width of the guide rail surface to reduce the specific pressure of the guide rail surface, and set up auxiliary guide rails to bear the external load.

3. Smooth and light movement of the guide rail: When the linear guide rail works, it should be light and labor-saving, with uniform speed, and there should be no crawling phenomenon at low speed.

4. The structural manufacturability of the guide rail is good: on the premise of ensuring other requirements of the guide rail, the structure of the guide rail should be simple to facilitate processing, measurement, assembly and adjustment, so as to reduce the cost. The guide rails used by different equipments must be analyzed in detail, and corresponding design requirements should be put forward.

5. Good wear resistance: The wear resistance of the guide rail is to guide the rail to maintain a certain accuracy after long-term use. The guide rail will be worn during use, but the amount of wear should be small, and it can be automatically compensated or easily adjusted after wear.

6. High adaptability to temperature change: the linear guide rail of linear module should still work normally under the condition of changing working temperature.

Diagnosis and maintenance methods of common faults of precision ball screw

Inspection and repair of clearance between ball screw nut pair and supporting system. When the numerical control machine tool has large reverse error, unstable positioning accuracy and knife marks in the quadrant, the first step is to check whether the screw system has clearance. The detection methods are as follows: put the ball in the center hole of one end of the lead screw with a dial indicator, measure the axial movement of the lead screw, and measure the movement of the worktable with another dial indicator. Turn the screw forward and backward, observe the values reflected on the two dial indicators, and confirm the fault location according to the changes of different values. Specific inspection and repair methods are as follows:

1. Inspection and repair of clearance of lead screw support bearing.

For example, when the dial indicator of the measuring screw rotates forward and backward, the pointer does not swing, indicating that the screw does not move. If the pointer of the dial indicator swings, it means that the lead screw has channeling phenomenon. At this time, we should check whether the back cap of the support bearing is locked, whether the support bearing has worn out and failed, and whether the pre-loaded bearing washer is suitable. If there is nothing wrong with the bearing, just refit it as a preload washer. If the bearing is damaged, it needs to be replaced, re-equipped as a preload washer, and then back the back cap tightly.

2. Inspection and maintenance of clearance produced by double nut pair of ball screw.

Pass the test, if it is confirmed that the fault is not caused by the lead screw movement. It is necessary to consider whether there is a gap between screw and nut pairs, and the detection method in this case is basically the same as the detection of screw movement.

3. Inspection and maintenance of single nut pair.

For single nut ball screw, the gap between screw and nut pair cannot be adjusted. If it is detected that there is a gap between the screw nut pair. First, check whether the thread arcs of the lead screw and nut are worn. If the wear is serious, a complete set of lead screw nuts must be replaced. If the wear is slight, the ball with larger diameter can be replaced for repair.

4. Gap caused by unfixed connection between nut flange and workbench.

This problem is generally easy to be ignored. Because of the long-term reciprocating motion of the machine tool, the screw for fixing the Farah disk is loose, which causes a gap. When checking the gap between the screw and nut, the fault factor should be eliminated first, so as to avoid detours during repair.

5. Maintenance of failures such as unstable movement and excessive noise of ball screw nut pair.

The unstable movement and excessive noise of ball screw nut pair are mostly caused by poor lubrication, but sometimes it may also be caused by improper adjustment of servo motor driving parameters.

Lubrication and dust prevention is a way to improve the service life of the ball screw

At present, with the high speed of the machine tool industry, the load on the ball screw is increasing, and the high-precision and large-lead screw is very necessary. Therefore, the ball screw has become an indispensable part of the machine tool. The maintenance method of the ball screw is generally the same as other devices to prevent dust and dryness, which affects work efficiency and prevents accident risks. Doing the following points can more effectively improve the service life:

(1) Eliminate the axial clearance. After the ball screw pair is disassembled and assembled, in order to ensure the accuracy of the reverse transmission and the axial rigidity, the axial clearance must be eliminated. The method of double nut ball screw pair to eliminate the gap is to use the relative axial displacement of the two nuts to make the balls in the two ball nuts stick to the two opposite sides of the threaded raceway respectively. When using this method to pre-tighten to eliminate the axial gap, it should be noted that the pre-tightening force should not be too large, otherwise it will increase the no-load moment and reduce the transmission efficiency.

(2) Regularly check the lubrication of the ball screw pair. Can be lubricated with grease and lubricating oil. Grease is generally added to the threaded raceway and the housing space where the nut is installed, and the lubricating oil is injected into the space of the nut through the oil hole on the housing. The grease on the ball screw should be replaced every six months, the old grease on the screw should be cleaned, and new grease should be applied. The ball screw pair lubricated with lubricating oil can be oiled once before each machine tool work.

(3) Protect the ball screw pair. The ball screw pair should be protected from dust or chips and closed, such as spiral spring steel belt casing, telescopic casing or folding casing. When installing, connect one end of the protective cover to the end surface of the ball nut, and fix the other end to the support seat of the ball screw.

If the ball screw is in a hidden position, a sealing ring can be used for protection, and the sealing ring can be installed on both ends of the nut. The contact seal ring has a good dust-proof effect, but due to the contact pressure, the friction torque is slightly increased. Non-contact sealing can avoid friction torque, but the dustproof effect is slightly worse. Avoid hitting the protective device when working, and replace the protective device in time if it is damaged.

(4) Regularly check the supporting bearings. Regularly check whether the connection between the screw support and the bed is loose, and whether the support bearing is damaged. If there is any problem, fasten the loose part and replace the supporting bearing in time.