LM Guide THK - Industrial Technologies

Индастриал Технолоджис www.industrial‐technologies.com.ua +38 044 498 21 94Point of DesignDesigning a Mounting Surface[Dimensions of the Reference Surface]When designing the reference surface, be sureto take into account the height and the thicknessof the datum area. If the datum area is too high,it may interfere with the LM block. If it is too low,the LM rail or the LM block may not closely contactthe reference-surface depending on thechamfer of the rail or the block. Additionally, ifthe datum area is too thin, the desired accuracymay not be obtained due to poor rigidity of thedatum area when a lateral load is applied orwhen performing positioning using a lateralmounting bolt . (Fig.4)[Dimensional Tolerance between the Reference Surface and the Mounting Hole]If the dimensional tolerance between the referencesurface of the LM rail or the LM block andthe mounting hole is too large, the rail or theW3block may not closely contact the reference surfacewhen mounted on the base.Normally, the tolerance should be within ±0.1mm depending on the model. (Fig.5)[Chamfer of the Tapped Mounting Hole]To mount the LM rail, the mounting surfaceneeds to be tapped and the tapped hole has tobe chamfered. If the chamfer of the tapped holeis too large or too small, it may affect the accuracy. (Fig.6)Guidelines for the chamfer dimension:Chamfer diameter D = nominal diameter of thebolt + pitchExample: Chamfer diameter D with M6 (pitch):D = 6 + 1 = 7W1AH2Fig.4Fig.5Fig.6W3W2DDCCBH1LM GuideIndustrial TechnologiesA1-307