First THK Ball Screw BTK2806A-2ZZ+1500LC7
* Precision ground screw
* Ball nut included
* C5/ accuracy quality
* Zero backlash
* Peaceful design and style
* Finishes machined for CZPT supports (see below)
* Reduced profile design
* Stroke listed over is for genuine movement of nut
* Ball nut supplied with grease fittings
NSK Ballscrew W1202 Ball Screw W1202T-166P-C3Z10 W1202FA-1P-C3Z5
THK hotsale inventory collection : BNK DIK DK BNF BIF BLR DIR BNS BLK BTK collection
THK Ball screw
Fanuc machine :T14iOLb , T21Fsb , T21iFb , T21iFLb
NSK Ball screw
ASM device AD8930 -----W1503H-1PG-C3Z20
Hitachi equipment ----------------W1202T-166P-C3Z10
Brother Machine : TC-S2Z TC-S2DZ TC-31A TC-S2A
Hollow screw W1201Z-752PTX-C1Z
W1202Z-561PY-C1Z2.5 W1202C-16PYC1Z2.5 VFA1210C7S-410
W2001-974PSS-C3Z W5004N-3PGX-C5Z W2004-733Z-C5Z
Comprehensive Design No.
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Specifying a Ball Screw
When you need a large-good quality ball screw, it is essential to pick a single with the suitable proportions and specs. When you are hunting for the greatest item, you ought to consider attributes this sort of as preloading, surface complete, and inside return technique. You can understand more about these attributes in this article. If you are doubtful which sort of ball screw to decide on, speak to a reliable supplier for more direction. To uncover the very best merchandise for your wants, click on here!
When specifying a Brinelling ball screw, it is crucial to know how significantly axial load it can properly bear. The static load potential, which is presented in the catalogue, applies only to pure axial loading, and any radial load that is smaller than 5% of the axial load won't pose a dilemma. For much more data, get in touch with a CZPT engineer. Brinelling ball screw support existence calculation should be carried out using the subsequent info:
Preload: The amount of load a ball screw can handle in the course of a solitary revolution. Preload is the load applied prior to the ball screw begins transferring, and the load is usually in between 5 and 10 p.c of the dynamic capacity. However, a ball screw that is subject matter to vibration will experience greater preload, requiring a lot more repeated lubrication. The resulting mechanical stress may cause the ball screw to buckle, or lead to the nut to re-flow into the balls.
Essential ball velocity: The highest pace at which the ball can transfer via the ball nut is known as the vital ball velocity. In distinction, running the ball screw at its vital shaft speed can guide to too much vibrations, major to premature failure of the finish support bearings and brinelling of the ball monitor. Hence, it is suggested to operate a ball screw at a reduced pace than the crucial ball speed to avert brinelling and plastic deformation of the balls.
False brinelling: Fake brinelling is a type of Fretting. False brinelling happens when the bearings are not rotating. The motion will end result in depressions or wear marks in the bearing raceway. This will cause noise, wear, and eventual fatigue. If these problems persist, a more recent ball screw ought to be utilized to take a look at the system. The equipment need to be operate for a number of several hours and analyzed prior to replacing the bearing.
The method of preloading ball screws minimizes backlash by applying force to the threads in the opposite route of the screw's route of rotation. It stops any movement of the screw relative to the nut. Different methods are used for preloading. A frequent one is to use oversized balls inside of the ball nut. A double nut system may possibly also be utilized. Each strategies are similarly successful. Regardless of the strategy utilized, the conclude consequence is the exact same - small backlash and enhanced effectiveness.
In the conventional approach of preloading ball screws, the motors operate simultaneously in opposite directions, leading to them to have a relative motion of about equal magnitudes. This minimizes the frictional resistance of the method, resulting in fast traverse. The method is capable to run with minimal backlash in the course of one hundred ten inches of journey, minimizing the warmth created by the drive nuts and the issues related with ball screw heating. Moreover, this approach can be employed in a wide variety of applications.
An additional approach of preloading ball screws is acknowledged as the ball-decide on method. This technique includes the use of over-sized balls that drive the balls into much more contacts with the screw and nut than a regular ball screw. The benefit of this technique is that it minimizes backlash because the balls are not machined to substantial tolerances. The drawback of this technique is that the ball screw will cost a lot more to manufacture than a regular ball screw and nut.
A standard design and style consists of a mechanical system that uses a series of balls to rotate a shaft. The issue of backlash is exacerbated by the mass of the shaft. The mechanical program is much more complicated than essential and frequently demands a great deal of work. The existing creation eradicates these problems by delivering an improved technique and equipment for driving ball screws. This method gives a much more successful preload power that is dynamically adjustable even though the system is operating. The technique can also improve friction and dress in.
Inside return method
There are two diverse sorts of ball screws. The 1st type is exterior and the next is interior. The external sort makes use of return tubes that protrude from the ball nut and extend over and close to the outside of the screw. The inner type uses a single tube that spans the ball track, although the much more frequent layout utilizes a number of tubes spanning 1.5 to 3.5 ball tracks. The inside technique includes a solitary return tube and a number of pickup fingers that guide the balls into the tubes.
The exterior return tube style is an less difficult, considerably less high-priced decision. The exterior ball return system has restricted area but can handle a broad selection of shaft diameters and prospects. Nevertheless, its physical size can make it incompatible with several higher-speed applications. Therefore, mindful thought ought to be given to the mounting alternatives. Inner ball return methods are best suited for tiny prospects and ball dimensions. Those that need to have a large pace will very likely reward from the external ball return program.
Inside ball screw technological innovation has also kept tempo with the calls for of linear drive techniques. Ball screw technological innovation is now more sturdy than ever. Strong internal ball return techniques circulate ball bearings by way of a solid pickup pin. These deflectors assist the balls return to the screw in the appropriate spot. They are vital elements in personal computer-controlled motion handle techniques and wire bonding. If you might be intrigued in the newest advances in linear screw technology, make contact with us these days.
Ball screws are superior to guide screws in several ways. Ball screws are much more effective than direct screws, converting ninety% of rotational motion into linear motion. As a end result, they are far more high-priced than direct screws and acme screws. They also supply a smoother movement over the complete journey assortment. Additionally, they need significantly less electricity for the same efficiency. It really is no wonder that the ball screw is so popular in a lot of different apps.
The surface finish of a ball screw is one of the crucial elements in figuring out the efficiency of the method. A ball screw with a great area end has outstanding overall performance in rolling resistance, backlash, and wear traits. Nonetheless, it is crucial to increase the surface area end of a ball screw to attain precision motion, lower use, and lower noise. To attain this, specific wire brushes will be used to polish precision-floor shafts.
For a ball screw to execute effectively, it need to be difficult, have a smooth floor, and keep lubricant. The surface finish of a ball screw ought to be sleek, cost-free of cracks, and keep the lubricant properly. Cracks and annealing are the two undesirable throughout the manufacturing method, so a quality device must be used for its floor complete. For the duration of the creation procedure, a CBN slicing insert with complete spherical or gothic arch profile can be utilized to obtain a higher-top quality floor end.
Yet another ending procedure employed in the manufacture of ball screws is lapping. Lapping improves surface area good quality and journey variation. It entails complicated relative actions of abrasive particulates with the workpiece. This removes a slender layer of materials from the workpiece, bettering its area top quality and dimensional precision. The lapping method can be carried out below lower-force conditions. It also improves the friction torque and lubrication.
In lapping experiments, friction torque has the largest affect on journey variation and surface roughness. A friction torque of about 1 N x m is optimum. In addition, rotational pace has only a small effect. The ideal mixture of these parameters is 1-1.5 N x m and 30 rpm. The minimal area end of a ball screw is all around 800 mesh. The smallest variation in journey is noticed at all around fifty percent-way through the journey.
Suitable lubrication of ball screw assemblies is crucial to keep the best possible performance and daily life. Ball screw assemblies should be lubricated with grease, which is launched straight into the ball nut. The lubrication port can be positioned at a variety of locations on the merchandise, which includes on the flange or in the external threads of the ball nut. Some ball nuts also function a zerk fitting for simpler lubrication.
The lubrication of ball screws is needed in the situation of running circumstances over 100oC. The bare minimum load for a ball screw is normally recognized with a preload pressure. The lubricant is conveyed via the slender lubrication hole because of to the relative motion of the two surfaces. The increased viscosity of the lubricant enables separation of the make contact with surfaces. To keep away from more than-lubrication, it is crucial to check out the lubricant degree routinely.
The oil utilized in lubrication of ball screw assemblies can be both mineral or artificial. The oil is composed of mineral or artificial oil, additives, and a thickening agent, these kinds of as lithium or bentonite. Other thickening agents incorporate lithium, barium complexes, or aluminum. The lubricant grade NLGI is a extensively utilised classification for lubricating greases. It is not adequate to choose a particular type of lubricant for a particular application, but it gives a qualitative measure.
Regardless of becoming important to the functionality of a ball screw, lubrication is also essential to its lifespan. Diverse varieties of lubricant supply corrosion security. Prior to employing a lubricant, make confident to extensively thoroughly clean and dry the ball screw. If there is any buildup of filth, it may injury the screw. To avert this from transpiring, you can use a solvent or lint-free of charge fabric. Lubrication of ball screw assemblies can tremendously lengthen the daily life of the assembly.