Caged Ball LM Guide Limited Stroke Model EPF

The limited stroke minimizes fluctuation in rolling resistance, making this guide ideal for locations requiring smooth motion on short strokes.

  • Long-term maintenance free
  • High accuracy
  • Finite stroke
  • Low friction
  • 4-way equal load
  • Miniature

Size : 7,9,12,15

Types

Highlight feature tags

  • Bolts mounted from above
Model EPF
  • Bolts mounted from above

Basic load rating (kN): Basic dynamic load rating 0.90 to 3.71 / Basic static load rating 1.60 to 5.88
Size : 7,9,12,15

Features

Structure and Features

Balls are held in cages with spherical ball holders and the balls roll in four rows of circular-arc grooves in raceways on precision-ground LM rails and LM blocks.

Smooth motion

Because a finite stroke is used, balls do not circulate and movement is smooth even with pre-loading. Also, because variations in rolling resistance are small, this model is ideal for locations where smooth movement is required with a short stroke.

High Rigidity

Because model EPF uses a DB construction featuring 4 rows of circular-arc grooves, it offers particularly high rigidity with respect to moment in the M C direction. This makes it ideal for locations where M C moment is applied with one rail.

Miniature Type

Because the mounting method is compatible with the Miniature LM Guide Model RSR-N, the models are dimensionally interchangeable.

4-way Equal Load

Each row of balls is configured at a contact angle of 45° so that the rated loads applied to the LM block are uniform in the all directions (radial, reverse radial and lateral directions), enabling the LM Guide to be used in all orientations and in extensive applications.

Ball cage technology application 1

Because the cage is formed out of plastic resin, there is no metal contact between the cage and the balls, providing excellent noise characteristics, low dust emissions and long product life.

Ball cage technology application 2

Forming the cage in a spherical shape out of plastic resin allows lubricant to be held in grease pockets, enabling long periods of maintenance-free operation.

Accuracy of the Mounting Surface

If there is not sufficient precision in the LM rail and LM block mounting surfaces, the product may not function to its full potential. Table1Machine to values no higher than those shown in... (Recommended value: 70% of Table1 )

Table1 Flatness of the LM Rail and the LM Block Mounting Surface
Unit: mm
Model No. Flatness error
EPF 7M, 9M 0.015/200
EPF 12M 0.025/200
EPF 15M 0.035/200

Note) It is recommended that highly rigid materials such as iron or cast metal be used as the mounting material.If a material with poor rigidity, such as aluminum, is used, unforeseen loading may be applied to the product. In such situations, contact THK.

Detailed information for each model number

Dimensional drawing/Dimensional table

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Products Contents
LM Guide LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc.
Ball Screw Axial clearance, maximum manufacturing length of shaft, etc.
Actuator Movable part mass, etc.

Standard Length of the LM Rail

THK Online Services
Member-Exclusive Content

These contents can be accessed

after registering as a member.

Log in/Register Click here for THK Online Services details

Benefit 1: Useful features

  • Easy product comparisonsHighlight feature
  • Save items for laterreview Favorites feature

Benefit 2: Exclusive content

Products Contents
LM Guide LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc.
Ball Screw Axial clearance, maximum manufacturing length of shaft, etc.
Actuator Movable part mass, etc.