Caged Ball Cross LM Guide Model SCR
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New Caged Ball Cross LM Guide Ball Cage Effect Cross-structured in a single piece with high rigidity SCR CATALOG No.319E

Ball Cage Effect The early forms of ball bearings were full-ball types without ball cages. Friction between balls caused loud noise, made high-speed rotation impossible and shortened the service life. Twenty years later, a Caged Ball design was developed for ball bearings. The new design enabled high-speed rotation at a low noise level, and extended the service life despite the reduced number of balls used. It marked a major development in the history of ball bearings. Similarly, the quality of needle bearings was significantly improved by the caged needle structure. With cage-less,...

Compact, Highly Rigid Caged Ball Cross LM Guide Grease nipple Ball cage Side seal Balls roll in four rows of raceways precision-ground on an LM rail and an LM block, and endplates incorporated in the LM block allow the balls to circulate. This model is an integral type of LM Guide that squares an internal structure similar to model SHS, which has a proven track record, with another and uses two LM rails in combination. Since an orthogonal LM system can be achieved with model SCR alone, a conventionally required saddle is no longer necessary, the structure for X-Y motion can be simplified...

Model SCR - Product Overview Since its LM blocks are integrated crosswise on the XY axes, this model ensures a compact XY It also allows a structure without a saddle, enabling the reduction of the weight and size of the system. I Major applications I XY table / hollow XY table / NC lathe

SCR OUTLINE Model SCR - Product Overview Drawing of Use with an Inner Saddle When four LM blocks of model SCR are joined with an inner saddle, assembly and adjustment of the system can easily be performed, and a highly rigid X-Y guide and high moment rigidity in the yawing direction are achieved. Inner saddle Ball screw mounting section on the X axis Ball screw mounting section on the Y axis *1: Dimensional table for model SCR Rated Loads in All Directions Model SCR is capable of receiving loads in all directions: radial, reverse-radial and lateral directions. Reverse-radial direction...

*1 : Basic dynamic load rating It refers to a load with a direction under which the rated life (L) of a group of dentical LM Guide units QService life The service life of an LM Guide is subject to variations even under the same operational conditions. Therefore, it is necessary to use the rated life defined below as a reference value for obtaining the service life of the LM Guide. •Rated life The rated life means the total travel distance that 90% of a group of units of the same LM Guide model can achieve without flaking (scale-like exfoliation on the metal surface) after individually...

Model SCR - Product Overview Q Radial Clearance Standards Since the radial clearance of an LM Guide greatly affects the running accuracy, load carrying capacity and rigidity of the LM Guide, it is important to select an appropriate clearance according to the application. In general, selecting a negative clearance (i.e., a preload*1 is applied) while taking into account possible vibrations and impact generated from reciprocating motion favorably affects the service life and the accuracy. Preload is an internal load elements (balls, rollers designated value before being shipped. Therefore, it...

Dimensional Table for Models SHS-V/SHS-LV ■ Example of model number 4 SCR25 QZ KKHH CO +1200/1000L P ÖTotal number of LM blocks HModel number HWith QZ Lubricator QDust prevention accessory symbol (see page 11 ) HRadial clearance symbol (see page 6) 0X axis LM rail length (in mm) QY axis LM rail length (in mm) OAccuracy symbol (see page 6)

The X-axis LM rail is tapped to allow the Cross LM Guide to be secured with bolts from the top face. LM rail tap dimensional table unit ■ Example of model number 4 SCR35 QZ KKHH CO +1000L P K/1000L P ÖTotal No. of LM blocks HModel number HWith QZ Lubricator QDust prevention accessory symbol (see page 11 ) HRadial clearance symbol (see page 6) 0X-axis LM rail length (in mm) QAccuracy symbol (see page 6) OLM rail tap type symbol

Standard Length and Maximum Length of the LM Rail for Model SCR The table below shows the standard LM rail lengths and the maximum lengths of model SCR variations. If the maximum length of the desired LM rail exceeds them, connected rails will be used. Contact THK for details. For the G dimension when a special length is required, we recommend selecting the corresponding G value from the table. The longer the G dimension is, the less stable the G area may become after installation, thus adversely affecting accuracy. Standard Length and Maximum Length of the LM Rail for Model SCR

Image SCR OPTIONS Options For model SCR, dust-prevention and lubrication accessories are available. Make a selection according to the application and the installation site. 7 Dedicated C-cap for LM rail mounting holes 4 Double seals Spacer 1 End seal 5 Laminated Contact Scraper LaCS 6 Metal scraper Inner seal QZ Lubricator 8 2 Side seal 3

Dust Prevention Accessories When foreign matter enters an LM system, it will cause abnormal wear or shorten the service life. It is necessary to prevent foreign matter from entering the system. Therefore, when possible entrance of foreign matter is predicted, it is important to select an effective sealing device or dust-prevention device that meets the working conditions. Used in locations exposed to Side seal Used in locations where dust may enter the LM block from the side or bottom surface, such as vertical, horizontal and inverted \\ Side seal Inner seal Used in locations severely...

Table 3 Symbols of Dust Prevention Accessories for Model SCR Used in harsh environments exposed to foreign matter such as fine dust and liquids. Contact scraper ^.foreign matter Structural drawing Table 4 Overall LM Block Length (Dimension L) of Model SCR with a Dust Prevention Accessory Attached Dedicated C-cap for LM Rail Mounting Holes If any of the LM rail mounting holes of an LM Guide is filled with cutting chips or foreign matter, they may enter the LM block structure. Entrance of such foreign matter can be prevented by covering each LM rail mounting hole with the dedicated cap so...