Linear guideways
152Pages

Linear Guideways Linear Guideways Accessories

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Linear guideways Linear guideways & accessories A linear guideway makes it possible to move in a linear motion with rolling elements. The use of balls and rollers between the rail and block in a linear guideway makes precise linear movements possible. Compared with a standard sliding guide, the friction coefficient here is just one fiftieth. The high efficiency and zero backlash mean that the linear guideway can be used in various ways. Assembly instructions and catalogue for download Here you can download the corresponding assembly instructions and the current catalogue as PDF files.

Linear guideways Contents

2.4 Service life calculation 11 2.11 Heat-resistant linear guideways 25 2.12 HIWIN coating for linear guideways 26 4.2 HIWIN grease guns and lubricants 149

Product overview 1. Product overview Linear guideway of HG and QH series Page 30 o Standard series in X arrangement o Block with SynchMotion™ technology (QH series) Linear guideway CG series o Standard series in O arrangement o Optional: Rail with cover strip Linear guideway of EG and QE series Page 66 o Flat type o Especially for applications with limited installation space o Block with SynchMotion™ technology (QE series) o Wide type o For maximum torque loads o Block with SynchMotion™ technology (QW series)

hiwimLinear guideway MG series Page 92 o Thin and wide design o Miniature type for the most compact applications o Dual-row linear guideways o Roller guides for heavy-duty applications o With maximum requirements on load ratings and torque capacity o Block with SynchMotion™ technology (QR series) o Roller guides for heavy-duty applications o With maximum requirements on load ratings and torque capacity o Rail with cover strip HG, QH, CG series with integrated positioning measuring system o Contactless positioning measurement o Signal output in real time o Lubricating nipple Lubrication...

Linear guideways General information 2. General information 2.1 Properties and advantages 1. High positioning accuracy A carriage supported by a linear guideway only has to overcome rolling friction. The difference between static and dynamic rolling friction is very small, which means that the breakaway force is only slightly higher than the moving force. No stick-slip effects occur. 2. Long service life with particularly precise movement With a sliding guide, errors in accuracy can occur due to different lubricant film thicknesses. Due to the sliding friction and frequent lack of...

2.3.1 Static load rating C0 If a linear guideway system is subjected to excessive loads or impacts during movement or at a standstill, localised permanent deformation occurs between the track and balls. As soon as this permanent deformation exceeds a certain level, it affects smooth operation of the guideway. According to its basic definition, the static load rating corresponds to a static load that causes permanent deformation of 0.0001 x ball diameter at the contact point that is loaded the most. The values are given in the tables for each linear guideway system. Using these tables, the...

2.4 Service life calculation 2.4.1 Definition of service life The constant and repeated loading of tracks and bafts of a linear guideway causes fatigue on the track surface. In the end, so-called pitting formation occurs. The service life of a linear guideway is defined as the total travel distance covered until pitting occurs on the surface of the track or balls. 2.4.2 Nominal service life (L) The service life can be very different even if linear guideways are manufactured in the same way and used under the same movement conditions. Therefore, the nominal service life is taken as a...

Load factor (fw) To take into account external influences on the service fife of the profile rails which are not directly included in the calculation (e.g. vibrations, jolting and high speed), the dynamic equivalent load is multiplied by the load factor according to Table 2.2. For short-stroke applications (stroke < 2 x block lengths), the calculated load factor must be doubled. L Nominal service life [km] Cdyn Dynamic load rating [N] P Dynamic equivalent load [N] 2.4.3 Service life (Lh) The service life in hours is calculated from the nominal service life with the aid of the travel speed...

2.5 Operating load 2.5.1 Calculation of load When calculating the loads acting on a linear guideway, various factors must be taken into account, e.g. the centre of gravity of the load, the approach of the movement force and the mass inertia at the beginning and end of the movement. To obtain a correct value, each parameter must be taken into account. Load on a block Table 2.3 Examples of the calculation of the load on a block Typical examples Load distribution P1...P4 Load on a single block W Weight of load F Movement force; additionally occurring force l Lever arm F c Rail distance d Block...

General information Load and mass inertia Table 2.4 Examples of the calculation of load and mass inertia Consideration of acceleration and braking 2 l: Load on a block o Constant velocity P1...P4 Load on a single block [N] t2 Constant travel time [s] l Distance to underside of rail - travel block centre of gravity [m] 2.5.2 Calculation of the equivalent load for variable loads If the load on a linear guideway varies greatly, an equivalent load must be included in the calculation of the service life. The equivalent load is defined as the load that causes the same wear on the bearings as the...

2.6.1 Frictional resistance The use of rolling elements in the linear guideway essentially reduces the friction to the rolling friction of the rolling elements. The friction coefficient of linear guideways is thus very small, up to one fiftieth of the value of traditional sliding guides. In general, the friction coefficient is about 0.004, depending on the series. If the load is only 10% or less of the basic dynamic load rating, most of the frictional resistance is generated by the wipers and by the grease and friction between the rolling elements. If the operating load becomes greater than...