|General features||Unit||iglide® J||iglide® J350||iglide® R||iglide® A180|
|Max. humidity absorption at 74°F/50% R. H.||% weight||0,3||0,3||0,2||0,2|
|Max. water absorption||% weight||1,3||1,6||1,1||1,2|
|Coefficient of surface friction, dynamic, against steel||µ||0,06 - 0,18||0,10 - 0,20||0,09 - 0,25||0,05 - 0,23|
|P x v value, max. (dry)||psi xfpm||9,700||13,000||8,700||8,750|
|Tensile strength at +68 °F||psi||10,590||7,977||10,150||12,760|
|Maximum recommended surface pressure (68°F)||psi||5,076||8,702||3,336||4,061|
Physical and thermal properties
|Max. long term application temperature||°F||+194||+356||+194||+194|
|Max. short term application temperature||°F||+248||+428||+230||+230|
|Minimum application temperature||°F||-58||-148||-58||-58|
|thermal / heat conductivity||[W/m x K]||0,25||0,24||0,25||0,25|
|Coefficient of thermal expansion (at 74°F)||[K-1 x 10-5]||10||7||11||11|
|Specific forward resistance||Ωcm||> 1013||> 1013||> 1012||> 1012|
|surface resistance||Ω||> 1012||> 1010||> 1012||> 1011|
Due to a flatter thread angle of about 30° in dryspin® high helix lead screws (similar to a trapezoidal thread), the applied force is efficiently converted into a translational motion. Compared with a steeper thread angle, this means a lower power loss.
Due to the radius tooth design, the contact surface between the lead screw nut and the lead screw is reduced. Thereby the dryspin® lead screw nuts move without vibration, virtually noiselessly. This is because, the greater the contact of two surfaces moving against one another, the more vibrations are transmitted, which can be perceived as a rattle or squeak. The rounded teeth minimize this effect and the thread moves without lubrication and with low noise.
Due to the larger distances between the individual dryspin® thread turns, the thread ideally matches the properties of the lubrication-free igus® high performance polymers. The proportion of the tribologically optimized polymer in the thread turns can be extended by a factor of 1.3 for all sizes. More wear resistant material and higher levels of efficiency are crucial for up to 5 times longer service life of standard geometries. The larger the lead screw diameter, the stronger the impact of this effect. Backlash can be minimized life-long by the use of dryspin® zero-backlash threaded nuts with integrated spring pretension.
Liners, sliding parts and lead screw nuts from drylin®
adapted for your application: self-lubricating, tested
15,000 tribology tests each year
More than 300 simultaneous operating test setups
140 trillion test motions
Continuous testing of drylin® products
igus® high performance polymers are used in all DryLin® linear and drive units as well as lead screw drives. The lubrication is incorporated into the bearing material, rendering the bearing materials suitable for dry-running conditions, i.g. they are maintenance-free for their entire service life.
DryLin® lead screw nuts are made from tribologically optimized materials. Starting in the development phase, the focus is on optimizing the friction properties of the DryLin® lead screw units, with the objective of attaining the lowest possible wear rates and friction values.
Every year, several hundred tests are set up and performed on threading test rigs at the igus® test laboratory. The results are incorporated into freely accessible online tools, where the service life and the required torque can be determined.