Finite Stroke Model EPF｜LM Guide｜Product Information｜THK Official Web Site [Japan/English]

Types

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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