dryspin® technology - technical information

Material table

Genera l features	Unit	iglidur® J	iglidur® J350	iglidur® R	iglidur® A180
Density	g/cm³	1,49	1,44	1,39	1,46
Colour		yellow	yellow	red	white
Max. humidity absorption at 23°C/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)	MPa x m/s	0,34	0,45	0,27	0,31
Mechanical properties
Bending E-module	MPa	2.400	2.000	1.950	2.300
Tensile strength at +20 °C	MPa	73	55	70	88
compressive strength	MPa	60	60	68	78
Maximum recommended surface pressure (20° C)	MPa	35	60	23	28
Shore D-hardness		74	80	77	76
Physical and thermal properties
Max. long term application temperature	°C	+90	+180	+90	+90
Max. short term application temperature	°C	+120	+220	+110	+110
Minimum application temperature	°C	-50	-100	-50	-50
thermal / heat conductivity	[W/m x K]	0,25	0,24	0,25	0,25
Coefficient of thermal expansion (at 23° C)	[K^-1 x 10^-5]	10	7	11	11
Electrical properties
Specific forward resistance	Ωcm	> 10¹³	> 10¹³	> 10¹²	> 10¹²
surface resistance	Ω	> 10¹²	> 10¹⁰	> 10¹²	> 10¹¹

Lead screw technical information
Lead deviation 0.1 mm / 300 mm
Straightness (standard) 0.3 mm / 300 mm
Directed <0.1 mm / 300 mm
Tolerance (in accordance with DIN 103) 7e

The tensile/compressive strength of the EN AW 6082 lead screw material is 160 MPa per mm² (elongation limit 0.2 mm)

A = Steep flank angle, standard geometry
B = Flat flank angle, dryspin® geometry

Higher efficiency due to optimised thread angle

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.

A = Angular-toothed flanks, standard geometry
B = Round-toothed flanks, dryspin® geometry

Low noise and vibration dampening due to rounded tooth geometry

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 minimise this effect and the thread moves without lubrication and with low noise.

1 = lead screw
2 = nut
A = symmetrical standard geometry
B = asymmetrical dryspin® geometry

Extended service life due to asymmetry

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 optimised 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 minimised life-long by the use of dryspin® zero-backlash threaded nuts with integrated spring pretension.

Tested: Lubrication-free iglidur® materials from igus®

Liners, sliding elements and lead screw nuts from drylin® adapted for your application: lubrication-free, tested and predictable.

15,000 tribology tests per year

More than 300 parallel test facilities

140 trillion test movements

Continuous testing of drylin® products

Lead screw system expert

dry-tech® polymers

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.

Selecting materials

drylin® lead screw nuts are made from tribologically optimised materials. Starting in the development phase, the focus is on optimising the friction properties of the drylin® lead screw units, with the objective of attaining the lowest possible wear rates and friction values.

Service-life

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.

X = Run length of dryspin® high helix thread in km
Y = Wear rate [μ/km stroke path of the nut]

dryspin® high helix thread wear test 10x25, load 175 N, 540 mm stroke, 125 RPM

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dryspin® - more technical information