LM Guide THK - Industrial Technologies

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Индастриал Технолоджис www.industrial‐technologies.com.ua +38 044 498 21 94Low Total CostCompared with a sliding guide, the LM Guide is easier to assemble and does not require highlyskilled technicians to perform the adjustment work. Thus, the assembly man-hours for the LM Guideare reduced, and machines and systems incorporating the LM Guide can be produced at lower cost.The figure below shows an example of difference in the procedure of assembling a machining centerbetween using siding guides and using LM Guides.Normally, with a sliding guide, the surface on which the guide is installed must be given a verysmooth finish by grinding. However, the LM Guide can offer high precision even if the surface ismilled or planed. Using the LM Guide thus cuts down on machining man-hours and lowers machiningcosts as a whole.[Assembly Procedure for a Machining Center]Using LM GuidesMachine baseTable and saddleMachiningAccuracy (straightnessand torsion) measurementwith a LM Guide temporarilymountedMachiningMounting base, table and saddleAccuracy measurementUsing Square Guides (Sliding Guides)Machine base Table and saddleMachiningAccuracy (straightness andtorsion) measurement witha square guide temporarilymountedScraping basemounting surfaceAccuracy measurementCorrective scrapingScraping by mating base with table and saddleMounting base, table and saddleAccuracy measurementMachiningDegreasing machinedsurfacesCoating surfaceswith special resinDrying in thermallycontrolled chamberWhen extremely high precision is not required (e.g., running accuracy), the LM Guide can beattached to the steel plate even if the black scale on it is not removed.Industrial TechnologiesA1-14
Индастриал Технолоджис www.industrial‐technologies.com.ua +38 044 498 21 94Features and TypesFeatures of the LM GuideIdeal Four Raceway, Circular-Arc Groove, Two-Point Contact StructureThe LM Guide has a self-adjusting capability that competitors' products do not have.This feature is achieved with an ideal four raceway, circular-arc groove, two-point contact structure.[Comparison of Characteristics between the LM Guide and Similar Products]LM Guide: Four Raceway, Circular-arcGroove, Two-point Contact Structured2 d1BALM Guide Model HSRContact widthBd1d2Contact widthRd2A1πd1B’πd2Fig.12Ball rotation axisR: Radius ofcurvatureDifferential slipA’Rotation axiRotation axiOther Product: Two-row, Gothic-arch GrooveFour Point Contact StructureTwo-row Gothic-arch groove productAs indicated in Fig.12 and Fig.13, when the ball rotates one revolution, the ball slips by the differencebetween the circumference of the diameter of inner surface (πd1) and that of the outer contact diameter(πd2). (This slip is called differential slip.) If the difference is large, the ball rotates while slipping,the friction coefficient increases more than 10 times and the friction resistance steeply increases.BAContact widthd2 d1d1Contact angled2Contact widthRπd1B’Rotation axisARFig.13Contact angleBd1d2Ball rotation axisR: Radius ofcurvatureDifferential slipπd2A’LM GuideIndustrial TechnologiesA1-15
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LM Guide THK - Industrial Technologies

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