Cross Roller Guide
11Pages

Linear Rail System Technical Data Technical Data Ball Screw Basic dynamic load rating SBC cross roller guides are mechanical bearings where a roller cage is assembled between two rails with “V” grooved raceway. Since the rollers are incorporated at right angles to each other, they can carry loads in all directions to create a highly rigid, high precision, compact linear motion guide. The basic dynamic load rating is the guide’s load capacity with a constant direction and constant magnitude load where a group of identical cross roller guides operating under the same conditions will last for at least 100Km of travel. The cross roller guide is commonly used in : Measuring and Optical instruments and other applications requiring high precision linear motion. [Basic dynamic load rating symbol] SCVR (Cross roller guide) SCVRT, SCVRU (Cross roller table) Support Unit CROSS ROLLER GUIDE Basic static load rating Linear Ball Bush The basic static load rating is the guide’s load capacity with a constant direction and constant magnitude load where the total permanent deformation of roller and raceway equals 0.0001 times the roller diameter. [Basic static load rating symbol] SCVR (Cross roller guide) SCVRT, SCVRU( Cross roller table) Cross Roller Guide Rated loads in all directions [SCVR( Cross roller guide) rated load] The dynamic load rating and static load rating in the tables is per roller. To calculate the load capacity for the bearing set, use the equation below. Robot Carrer Guide [SBC Cross roller products] CROSS ROLLER GUIDE : SCVR A combination of four rails and two cages. CROSS ROLLER TABLE : SCVRT, SCVRU A stage using cross roller guides for precision motion. [SCVRT, SCVRU( Cross roller table) rated load] The rated loads of models SCVRT and SCVRU are equal in all four directions (radial, reverse radial, lateral directions) and their rated load values are same as C and Co from the specification table

Linear Rail System Technical Data Technical Data Ball Screw Life Calculation Static Safety Factors (fS) The life calculation of a cross roller guide is calculated using the equation below. When Cross roller guide products are used in applications, they may carry unexpected loads. For example, reciprocating machines typically create moment loads because of an offset center-of-gravity and the acceleration. [Nominal life] L (km) : Nominal life P (N) (Radial Load) : Basic dynamic load rating : Temperature factor : Calculated load : Calculated load C (N) Co : Basic dynamic load rating Support...

Linear Rail System Technical Data Technical Data Ball Screw Clearance and Preload Load factor (fW) Vibration and Impact Very slight Slight Moderate Strong Accuracy Support Unit Reciprocating machines typically create vibrations which are very difficult to calculate precisely. Please refer to the following table to compensate for these vibrations. It is easy to adjust the preload of a cross roller guide, please refer to preload adjustment section of the catalog. Refer to the catalog page of the specific model number for the specified accuracy. Mounting method Refer to the catalog pages of...

Linear Rail System Cross Roller Guide SCVR Type Cross Roller Guide SCVR Type Ball Screw Structure and Features [Easy mounting] Since mounting holes in raceways are counter bored with tapped holes, it is possible to mount the guide in both directions. Support Unit Linear Ball Bush (Dedicated rail mounting hole) (How to mount bolts on dedicated rails) Cross Roller Guide SCVR type is a liner guide where the ball cage is assembled to between the rails with “V” grooved raceway. Since the rollers are incorporated at right angles to each other, they can carry loads in all directions to form a...

Linear Rail System Cross Roller Guide SCVR Type Cross Roller Guide SCVR Type Ball Screw Accuracy Standards Mounting Method Support Unit Parallelism of the raceway against Surfaces A and B Dimensional tolerance in height E Temporarily mount the rail 4 to the table. ( When designing the system, please remember that the rail must be mounted and tightened after assembly) Dimensional tolerance in width M Install the rails 2 and 3 to base and rail 1 to table. Tighten the rail-mounting bolts ensuring the rails are firmly against the mounting surfaces. (*The difference in height E applies to four...

Linear Rail System Cross Roller Guide SCVR Type Cross Roller Guide SCVR Type Ball Screw Clearance adjusting Position roller cage in the center of the rail as in G-9. Tighten the preload bolts b, c, d evenly with a torque wrench within the area of roller until dial gauge shows desired value. ( The value of dial gauge is same as the preload of one roller.) Design the preload method to uniformly preload the rail over the entire length. Support Unit Using pressing plate Using tapered gibs : Most common method of preloading using a setscrew to push the rail. Press plate Linear Ball Bush Normal...

Linear Rail System Cross Roller Guide SCVR Type Cross Roller Guide SCVR Type Ball Screw Precautions When using a cross roller guide, please follow these precautions. [Cage Creep] The roller cage moves accurately but it may drift off center over time (cage creep) due to vibrations, inertia or impact. The roller cage move the half the travel distance of the table in the same direction. Please mount an external stop for the table. Do not depend on the rail end stops to control the travel. If the cage length is S, the rail length (Lk) must match the following equation to prevent the cage from...

Linear Rail System Cross Roller Guide SCVR Type Cross Roller Guide SCVR Type Ordering Example The holes of the bolt(D1, d1) should be designed carefully for the preload adjustment. Ball Screw Design Mounting Bolt [Cross roller guide] Support Unit [1] Model No. : SCVR 1, 2, 3, 4, 6, 9 type [2] Accuracy Grade : H(High), P(Precision) [3] Rail Length [4] Number of Rollers Linear Ball Bush [5] Surface treatment : No Symbol (Standard), R (Surface treatment) A combination of four rails and two cages. When ordering surface treatment, please fill out Symbols for surface treatment. Standard (no...