Page 52 - IGUS Linear

drylin linear technology | Design rules drylin linear technology | Cleanroom and ESD compatibility
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Cleanroom suitability and ESD
Floating bearings for guide systems Eccentric forces
In the case of a system with two parallel guides, one side To ensure successful use of maintenance-free drylin linear
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needs to be fitted with floating bearings. A suitable solution bearings, it is necessary to follow certain recommendations: compatibility of drylin ®
comprising fixed and floating bearings is available for every if the distance between the driving force point and the fixed
installation position, whether horizontal, vertical or lateral. bearings is more than twice the bearing spacing (2:1 rule),
This type of assembly prevents jamming and blockage a static friction value of 0.25 can theoretically result in drylin linear guides from igus ®
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on the guides resulting from discrepancies in parallelism. jamming on the guides.
Floating bearings are created through a controlled extension This principle applies regardless of the value of the load All drylin guides are clearly qualified for cleanroom applications. The measurement results of the ESD compatibility according
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of the clearance in the direction of the expected parallelism or drive force. The friction product is always related to the The differentiation between the various cleanroom classes to SEMI E78-0998 show that the linear guide system
error. fixed bearings. The greater the distance between the drive is only dependent on load and speed drylin NK-02-40-02 can be classified
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During installation, take care that the floating bearing has and the guide bearing, the higher the wear and required of the application. The combination as "level 1" (highest rank). See Fraunhofer
approximately the same clearance on both sides. You drive force. of iglidur J and hard-anodised IPA Report No.: IG 0308-295 73
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can see the version of the fixed/floating bearing system Failure to observe the 2:1 rule during a use of linear plain aluminium is classified as level 1 in the
recommended by us in the designs shown in the individual bearings can result in uneven motion or even system ESD compatibility according to SEMI TK-01-25-02 drylin
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sections about the systems. The mounting surfaces of the blockage. Such situations can often be remedied with E78-0998 (highest rank). linear guide system
guides and carriages should possess a good evenness relatively simple modifications. "For the linear guide system drylin
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(e.g. machined surface) to prevent twisting in the system. If you have any questions on design and/or assembly, The following drylin guides from igus were tested: N40, TK-01-25-02 by igus GmbH, it is possible, on the calculations
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Smaller areas of mounting surface unevenness can be please make use of our technical support. W10, T25 and T30. of the likelihood of violation of threshold values of the
compensated to a certain extent by the floating bearing. See below for detailed results. detection sizes 0.2μm, 0.3μm, 0.5μm, and 5μm with motion
speed of v = 1m/s, to clearly derive suitability for cleanrooms
drylin TK-10-30-01 linear guide system classified as ISO Class 5 according to DIN EN ISO 14644-1."
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"For the linear guide system drylin TK-10-30-01 by igus The measurement results of the ESD compatibility according
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Floating Fixed Floating Fixed bearing 2 x GmbH, it is possible, on the calculations of the likelihood of to SEMI E78-0998 show that the linear guide system drylin
bearing bearing bearing violation of threshold values of the detection sizes 0.2μm, TK-01-25-02 can be classified as "level 1" (highest rank).
0.3μm, 0.5μm, and 5μm with motion speed of v = 0.1m/s,
to clearly derive suitability for cleanrooms classified as ISO WK-10-40-15-01 drylin linear guide system
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Class 3 according to DIN EN ISO 14644-1." "For the linear guide system drylin WK-10-40-15-01
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by igus GmbH, it is possible, on the calculations of the
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NK-02-40-02 drylin linear guide system likelihood of violation of threshold values of the detection
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1x "For the linear guide system drylin NK-02-40-02 by igus sizes 0.2μm, 0.3μm, 0.5μm, and 5μm with motion speed of
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GmbH, it is possible, on the calculations of the likelihood of v = 1m/s, to clearly derive suitability for cleanrooms classified
violation of threshold values of the detection sizes 0.2μm, as ISO Class 6 according to DIN EN ISO 14644-1."
0.3μm, 0.5μm, and 5μm with motion speed of v =1m/s, The measurement results of the ESD compatibility according
to clearly derive suitability for cleanrooms classified as to SEMI E78-0998 show that the linear guide system drylin
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ISO Class 6 according to DIN EN ISO 14644-1." WK-10-40-15-01 can be classified as "level 1" (highest rank).
Figure 02: Automatic compensation of parallelism Figure 03: The 2:1 rule
errors See Fraunhofer IPA Report No.: IG 0308-295 74

Tightening torque for drylin metallic screws
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Metric thread (Da) tightening torque Recommended tightening torque
[Nm] [Nm]
M3 0.5 - 1.1 0.7
M4 1.0 - 2.8 1.5
M5 2.0 - 5.5 3.0
M6 4.0 - 10.0 6.0
M8 8.0 - 23.0 15.0
M10 22.0 - 46.0 30.0

Please be aware of the minimal screw-in depth for aluminium and zinc die-casting parts: 1.5xDa ASEAN 09/2023 ASEAN 09/2023

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