Predicting the Rigidity
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Catalog excerpts

Predicting the Rigidity - 1

Predicting the Rigidity Selecting a Radial Clearance (Preload) 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* is applied) while taking into account possible vibrations and impact generated from reciprocating motion favorably affects the service life and the accuracy. For specific radial clearances, contact THK. We will help you select the optimal clearance according to the conditions. The clearances of all LM Guide models (except model HR, GSR and GSR-R, which are separate types) are adjusted as specified before shipment, and therefore they do not need further preload adjustment. *Preload is an internal load applied to the rolling elements (balls, rollers, etc.) of an LM block in advance in order to increase its rigidity. Table12 Types of Radial Clearance Normal Clearance Clearance C1 (Light Preload) Clearance C0 (Medium Preload) ● The loading direction is fixed, ● An overhang load or moment ● High rigidity is required and impact and vibrations are miniload is applied. vibrations and impact are apmal and 2 rails are installed in ● LM Guide is used in a singleplied. parallel. rail configuration. ● Heavy-cutting machine tool ● Ve r y h i g h p r e c i s i o n i s n o t ● Light load and high accuracy required, and the sliding resisare required. tance must be as low as possible. • • • • • • • • • Beam-welding machine Book-binding machin Automatic packaging machine XY axes of general industrial machinery Automatic sash-manufacturing machine Welding machine Flame cutting machine Tool changer Various kinds of material feeder • Grinding machine table feed axis • Automatic coating machine • Industrial robot • various kinds of material high speed feeder • NC drilling machine • Vertical axis of general industrial machinery • Printed circuit board drilling machine • Electric discharge machine • Measuring instrument • Precision XY table • Machining center • NC lathe • Grinding stone feed axis of grinding machine • Milling machine • Vertical/horizontal

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Predicting the Rigidity - 2

Point of Selection Predicting the Rigidity Service Life with a Preload Considered When using an LM Guide under a medium preload (clearance C0), it is necessary to calculate the service life while taking into account the magnitude of the preload. To identify the appropriate preload for any selected LM Guide model, contact THK. When the LM Guide receives a load, its rolling element, LM blocks and LM rails are elastically deformed within a permissible load range. The ratio between the displacement and the load is called rigidity value. (Rigidity values are obtained using the equation shown...

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Predicting the Rigidity - 3

Radial Clearance Standard for Each Model Radial clearances for models SHS and SCR Radial clearance [Radial clearance for models SVR/SVS and NR/NRS] Unit: m Indication symbol Light preload Medium preload Radial clearance for model SSR Light preload Indication symbol Light preload Medium preload Radial clearance for model SHW Radial clearance for model SRS Unit: m Indication symbol Light preload Medium preload Indication symbol

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Predicting the Rigidity - 4

Point of Selection Predicting the Rigidity Radial clearance for models HSR, CSR, HSR-M1 and HSR-M1VV Unit: m Indication symbol Model No. 8 Indication symbol Model No. 45 Radial clearances for models SR and SR-M1 Radial clearance for model HRW Indication symbol Model No. 15 Indication symbol Model No. 12 Radial clearance for models RSR, RSR-W and RSR-M1 Unit: m

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Predicting the Rigidity - 5

Radial clearance for model JR Radial clearances for models HCR and HMG Unit: m Indication symbol Model No. 25 Light preload Indication symbol Model No. 12 Radial clearance for model NSR-TBC Radial clearance for model HSR-M2 Unit: m Indication symbol Model No. 20 Indication symbol Model No. 15 Light preload Radial clearances for models SRG and SRN Radial clearance for model SRW Indication symbol Model No. 15 Indication symbol Model No. 70 Radial clearance for model EPF Unit: m Indication symbol Model No. 7M 9M 12M 15M

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