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Saturday, February 21, 2009

Linear Motion Rolling Guide Series

Intrinsic advantage of rolling guide.

1. Higher accurate postitioning performance.

The superior response characteristics to the microfeeding assure smooth and extremely accurate positionign performance due to the substantialreduction in differences between dynamic and static (start-up) friction. Variation in friction caused by rapid changes in velocity are also largely eliminated.

2. Reductions in the size of driving component and cost of power consumption

The uniform and low coefficient of friction allows the use of smaller drives, making possible more compact and lighter machine designs. Power consumption of the drive components and their costs are reduced as well. Thsese factors permit faster producation cycles and operating speeds, boosting overall manufacturing productivity.

3. hight reliable accuracy in long run operation.

The virtual elimination of wear and abrasinon raceway maintanins high accuracy and reliability of machines/instruments in long run opration. Additionally, the thinner oil fims needed to lubricate Linear Motion Rooling Guides in comparison to conventional Plain Guides reduce errors caused by cariations in the thickness of the oil fimls.

4. Improvement of pruduct reliablitty from first design.

Reliability of the machines/equaipment is improved from the first stage of the dasign by using the established life calculations based on rolling contact fatigue of Linear Motion Rolling Guides.

5. Simple design of lubrication.

Simple and easy-to-use lubrication systems are user-convenient. In most casees, grease lubrication in sufficient, requirng only infrequent relubricaiton.

Features of Linear Motion Rolling Gudies.

1. A choise between two basic design concepts assures the best selection

Linear Motion Rolling offers two design concepts: Steel balls and cylindrical roller types. Steel ball types are most suited for light and medium duty applications. where good load capacity and low frictional resistance are the primary requirments. Cylindrical rooler types, in comparison, are most often selected for machines needing heavy load capacity and very high rigidity.

2. A wide selection of various types for all kinds of industrial uses.

Suitable designs for both limited and ulimited stroke lenght as well as differing accuracy requirement are all part of standard product lines.

3. A fuctional simplicity in structure yields high reliability.

Linear Motion Rooling Guides feature extremely functional and simple designs in which rooling elements are typically assembled in two separated raceway circuits. Compared to more complicated disigns needing extra steps in mounfacturing, the efficient simplicity of designs reuce the potential processing errors during the various stares of proudction.

4. Process reductions in designing and assembling.

Desing and assembly times are shortened due to the uniqure fucntional simplictiy of Linear Motion Rooling Gudies.

5. Superior performance and high quality through advanced manufacturing teachniques an traditon.

Priecise machining processes and efficient maufacturing methods have been develped to support successful efforts to achieve and maintain and internationally rocognized reputation as a munufacturer of top quality needle roller bearings and other ifne mechancal components. This firm commitment to maufacturing excellence is reflected in the superior performance and high quality of Linerar Motion Rolling Gudies.

Load Rating and life

Lif fo linear motion rolling gudes

Linear Motion rolling duides will eventually wear out even under normal operation due to roolling contact fatigue. Namely, as long as the carry some load, rolling elements and the raceways to the outer ring, shaft, track rail, slide unit, etc. will be damaged by falking caused by fatigue and the loss of scaled fragments from their surfaces. Such rolling guides can no longer by used.

the life of linear motion rolling gudies is defiened as the total traveling distance accomplished before the first evidence of fatigue flaking appears on the raceway or rolling element. However, where a group of rolling guide units with the same material, size, construction and heart treatment are operated until the above fatigue flaking appears under the same operating conditions, there will be an uneven dispostion in each life because the phenomenon of material fatigue appears somewhat random.

Therefore, the life of rolling gudies is figured by a statistical method. As the reliability of rolling guides is very improtant, it is not appropriated to select necessary rolling guides on the poses to consider a travel life which the majority of the selected rolling guides are assured of reaching. Such life is the rated life defined below.

Rated Life.

The rated life is defined as the total traveling distance that 90% of a group of the same rolling guides under the same conditions can run free from and material damage caused by rolling fatigue.

However, the rated life of the Stroke Ball Cage Assembly is repreasented by the total number of revolutions.

Wednesday, February 18, 2009

bearing picture


Deep Groove Ball bearings, High speed & low radial load
Self-Aligning Ball Bearings High speed & low load & misaligned shaft
Spherical Roller Bearings, Low speed & high load & misaligned shaft
Tapered Roller bearings Low speed & high angular load
Cylindrical Roller Bearings, Low speed & high radial load
Thrust Ball Bearings High speed & low thrust load
Ball Bearing Unites Angular,Unitetes applcation
Angular Contact Ball Bearings High speed & low angular load

Tuesday, February 17, 2009

Life of linear motion rolling guides

Life of linear motion rolling guides:

Linear motion rolling guides will eventually wear out even under normal operaion due to rolling contact fatigue.

Namely, as long as they carry some load, rolling elements and the raceways of the outer ring, shaft, track, rail, slide unit, etc. will be damaged by flaking caused by fatigue and the loss of scaled fragments from their surfaces. Such rolling guide can no longer be used.

The life of linear motion eolling guide is defined as the total traveling distance accomplished before the first evidence of fatigue flaking appears on hte raceway of rolling element.

However, where a group of rolling guide units with the same material size construction and deat treatment are operated unit the above fatigue flaking appears under the same operating condetions, there will be uneven disposition in each life because the phenomenon of maretial fatigue appears somewhat random.

therefore, the life of rolling guides is figured by a statistical method. As the reliability of rolling guide is very important, it is not appropriate to select necessary rolling guide on the basis of their average life. It is necessary for practical purposes to consider a travel life which the majority of the celected rolling guide are assured of reaching. Such life is the rated life defined below.



Rated Life
The rared life is defined as the total traveling distance that 90% of a group of the same roling guides under the same condition can fun free from any marerial damage caused by rolling fatigue.
However, the rated life of the strole ball cage assembly is represented by the total number of revolutions.



Muhammad Ahsan Rana