SNS, full name of the Social Networking Services, the social networking services, specifically refers to is designed to help people build social networks of Internet applications. Also refers to the popularity of social maturity of the existing information carriers, such as SMS text messaging service. Another common explanation SNS: Full name Social Network Site, or "social networking" or "social net."
500-5E0 SNR/SNS Ultra-heavy Load Type for Machine Tools Model SNR/SNS Caged Ball LM Guides - Ultra-heavy Load Type for Machine Tools Model SNR/SNS Caged Ball LM Guide Ultra-heavy Load Type for Machine Tools Model SNR/SNS 0 90 ° LM block ° 40 Endplate Radial Type Model SNR Cross section 50° End seal LM rail ° 40 Ball cage Ball 4-Way Type Model SNS Cross section * For the ball cage, see A1-106. Structure and Features A1-125 Types and Features A1-126 Rated Loads in All Directions A1-129 Equivalent Load A1-129 Service Life A1-76 Radial Clearance Standard A1-89 Accuracy Standards A1-95 Shoulder Height of the Mounting Base and the Corner Radius A1-309 Error Allowance in the Parallelism between Two Rails A1-315/A1-316 Error Allowance in Vertical Level between Two Rails A1-318/A1-319 Dimensional Drawing, Dimensional Table, Example of Model Number Coding B1-26 Standard Length and Maximum Length of the LM Rail B1-42 A1-124 500-5E0 Features of Each Model Ultra-heavy Load Type for Machine Tools Model SNR/SNS Structure and Features Balls roll in four precision ground raceways on the LM rail and LM block, and ball cages and end- plates incorporated in the LM block allow the balls to circulate. Use of the ball cage eliminates friction between balls and increases grease retention, thus to achieve low noise, high speed and long-term maintenance-free operation. LM Guide The raceways are ground into deep grooves that have a radius closer to that of the balls than in the conventional design, using special equipment and an extremely precise cutting technique.This design allows high rigidity, high vibration/impact resistance and high damping capacity, all of which are required for machine tools, thus making these models capable of bearing ultra-heavy loads. * Due to the extremely high rigidity of the LM guides used in SNR/SNS models, the construction is highly tolerant of the effects of mounting face misalignment and installation errors. Where such effects arise, there is a risk of reduced operating life and/ or malfunction. Contact THK when considering the use of these products. [Improved Damping Capacity] While the machine tool (equipped with NR or NRS) is not cutting a workpiece during operation, the LM Guide travels normally and smoothly. While the machine tool is cutting the workpiece, the cutting force is applied to the LM Guide to increase and the contact area between the balls and the raceway, allowing an appropriate mixture of rolling and sliding motions to be achieved. Accordingly, the friction resistance is increased and the damping capacity is improved. Since the differential slip during the rolling and sliding motion is insignificant, it causes little wear and does not affect the service life. [Highly Rational LM Guide] The excessively large differential slip occurring in a Gothic-arch groove does not happen with these models. They smoothly travel and achieve high positioning accuracy during fast feeding.During the cutting operation, appropriate slip occurs according to the cutting load, the rolling resistance is increased and the damping capacity is increased. Thus, models NR and NRS are highly rational LM Guides. [High Rigidity] To improve the rigidity of the LM block and the LM rail, which may have reduced overall rigidity of the LM Guide in the reverse radial and lateral directions, THK made full use of FEM to achieve optimal design within the limited dimensional range. Since THK provides two identically sized models with different characteristics, namely the radial model SNR and four-way model SNS, users can select the model that best suits their specifications. [Ultra-heavy Load] Since the curvature of the raceway is approximated to the ball diameter, the ball contact area under a load is increased and the LM Guide is capable of receiving an ultra-heavy load. A1-125 500-5E0 Types and Features Models SNR-R/SNS-R Specification Table B1-26/B1-28 With this type, the LM block has a smaller width (W) and tapped holes. Used in places where the space for table width is limited. Models SNR-C/SNS-C Specification Table B1-30/B1-32 The flange of the LM block has tapped holes. Can be mounted from the top or the bottom. Can also be used in places where the table can- not have through holes for mounting bolts. Models SNR-RH/SNS-RH (Build to Order) Specification Table B1-34/B1-36 The dimensions are almost the same as that of LM Guide models SHS and HSR, and the LM block has tapped holes. A1-126 500-5E0 Features of Each Model Ultra-heavy Load Type for Machine Tools Model SNR/SNS Models SNR-CH/SNS-CH (Build to Order) Specification Table B1-38/B1-40 The dimensions are similar to that of LM Guide models SHS and HSR, and the flange of the LM block has tapped holes. LM Guide Models SNR-LR/SNS-LR Specification Table B1-26/B1-28 The LM block has the same cross-sectional shape as models SNR-R/SNS-R, but has a longer overall LM block length (L) and a greater rated load. Models SNR-LC/SNS-LC Specification Table B1-30/B1-32 The LM block has the same cross-sectional shape as models SNR-C/SNS-C, but has a longer overall LM block length (L) and a greater rated load. A1-127 500-5E0 Models SNR-LRH/SNS-LRH (Build to Order) Specification Table B1-34/B1-36 The LM block has the same cross-sectional shape as models SNR-RH/SNS-RH, but has a longer overall LM block length (L) and a greater rated load. Models SNR-LCH/SNS-LCH (Build to Order) Specification Table B1-38/B1-40 The LM block has the same cross-sectional shape as models SNR-CH/SNS-CH, but has a longer overall LM block length (L) and a greater rated load. A1-128 500-5E0 Features of Each Model Ultra-heavy Load Type for Machine Tools Model SNR/SNS Rated Loads in All Directions Model SNR/SNS is capable of receiving loads in four directions: radial, reverse radial and lateral CL C directions. Their basic dynamic load ratings are PL C0L C0 PR represented by the symbols in the radial direc- CT CT C0T C0T LM Guide tion indicated in Fig.1, and the actual values are provided in the specification tables for SNR/ PT PT SNS. The values in the reverse radial and lat- eral directions are obtained from Table1 and Fig.1 Table2 below. Table1 Basic Load Ratings of Model SNR in All Directions Table2 Basic Load Ratings of Model SNS in All Directions SNR SNS Direction Basic dynamic Basic static Direction Basic dynamic Basic static load rating load rating load rating load rating Radial direction C C0 Radial direction C C0 Reverse radial direction CL=0.64C C0L=0.64C0 Reverse radial direction CL=0.84C C0L=0.84C0 Lateral directions CT=0.47C C0T=0.38C0 Lateral directions CT=0.84C C0T=0.84C0 Equivalent Load When the LM block of model SNR receives a reverse radial load and a lateral load simultaneously, the equivalent load is obtained from the equation below. Table3 Equivalent Factor of Model SNR PE X•PL Y•PT PE X Y PE : Equivalent load (N) Equivalent load in reverse 1 1.678 : Reverse radial direction radial direction Equivalent load in lateral : Lateral direction direction 0.596 1 PL : Reverse radial load (N) PT : Lateral load (N) X, Y : Equivalent factor (see Table3) When the LM block of model SNS receives a radial load and a lateral load, or a reverse radial load and a lateral load, simultaneously, the equivalent load is obtained from the equation below. Table4 Equivalent Factor of Model SNS PE X•PR (PL) Y•PT (When radial and lateral loads are applied) PE : Equivalent load (N) PE X Y : Radial direction Equivalent load in the 1 0.935 radial direction : Reverse radial direction Equivalent load in lateral : Lateral direction 1.07 1 direction PR : Radial load (N) Table5 Equivalent Factor of Model SNS PL : Reverse radial load (N) (When reverse radial load and lateral load are applied) PT : Lateral load (N) PE X Y X, Y : Equivalent factor Equivalent load in reverse 1 1.02 (see Table4 and Table5) radial direction Equivalent load in lateral 0.986 1 direction A1-129 500-5E0 Service Life For details,see A1-76. Radial Clearance Standard For details,see A1-89. Accuracy Standards For details,see A1-95. Shoulder Height of the Mounting Base and the Corner Radius For details,see A1-309. Error Allowance in the Parallelism between Two Rails For details, A1-315 and A1-316. Error Allowance in Vertical Level between Two Rails For details, A1-318 and A1-319. A1-130 500-5E0 Features of Each Model Ultra-heavy Load Type for Machine Tools Model SNR/SNS LM Guide A1-131
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