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igus® Ltd.
It offers a wide range of different lead screw nuts and lead screw models in various dimensions. The range of dryspin® high helix threads includes diameters from 4 to 20mm and pitches from 2.4 to 100mm. Due to the diversity of the product range, the dryspin thread geometry is conceivable in almost all applications.
Basically, yes. It is necessary to adhere to the application parameters (axial load, rotation speed, etc.) and reach the required positioning accuracy. Our lead screw drive expert offers optimal help for choosing the perfect lead screw system for every application.
► Higher efficiencies
► Quiet and low-vibration operation
► 30% longer service life due to asymmetry
► Up to 25% less wear
► Higher efficiency
Our drylin lead screw nuts are up to 50.9% more cost-effective than metal lead screw nuts. Also up to 69% more cost-effective compared to comparable plastic lead screw nuts and up to 50% more cost-effective compared to ball screw systems.
Self-locking means that lead screw nuts and lead screws cannot be moved without the application of external force. It has to do with the pitch and coefficient of friction.
Lead screw nuts that are made of tribologically optimised iglidur® materials can be used in temperature ranges between -20°C and +150°C.
Our lead screw support blocks are available in thread sizes of 6-24mm. Choice of mounting: plain bearings or, with higher dynamics, ball bearings (BB). All lead screw support blocks, like the matching lead screw clamp rings, are supplied in hard anodised aluminium.
In addition to the correct choice of material for the lead screw nut, a preload mechanism against unwanted bearing clearance has proven to be an effective measure in practice. For trapezoidal threads and dryspin® high helix threads, anti backlash, zero backlash & low clearance versions with preload of the thread nut are available.
It is no secret that igus is an advocate of non-lubrication of bearings. Simply put, lubrication is not required for igus products. We often hear from customers the recurring question: “Can I use WD-40 or another lubricant to lubricate my bearing? ”
► What is the difference between single and multi-start threads?
Single-start lead screws consist of only one thread. This means that the distance between the flanks, marked by pitch, is also the linear travel (lead) in millimetres per revolution of the lead screw.
If another thread is added, the lead screw reaches twice the stroke (2x pitch) with one revolution. The calculation for the linear travel always remains the same depending on the number of threads, only the pitch of a single thread differs. This procedure can also be applied to our multi-start dryspin® high helix lead screws.
| Material | MPa |
|---|---|
| iglidur® J | 4 MPa |
| iglidur® W300 | 5MPa |
| iglidur® A180 | 3.5 MPa |
| iglidur® J350 | 2 MPa |
| iglidur® E7 | 0.5 MPa |
| iglidur® J200 | 2 MPa |
| iglidur® R | 2 MPa |
The load capacity of trapezoidal lead screw nuts made of high-performance polymers depends on the surface pressure, the sliding speed and the resulting temperature. The temperature behaviour is also influenced by the operating time and the selected lead screw material and its specific thermal conductivity.
Surface speeds of the iglidur® materials in m/s:
| iglidur® material | Rotating long-term |
|---|---|
| iglidur® J | 1,5 |
| iglidur® W300 | 1,0 |
| iglidur® A180 | 0,8 |
| iglidur® J350 | 1,3 |
With the pv value and the percentage contact area stated in the dimensions tables, the permissible sliding speed and from it the feed speed for each thread size can be determined.
Standard values when using drylin® polymer nuts without lubrication (with 500mm stroke). A correction factor must be reckoned for very short or long strokes.
| Operating time ED | pv-valuemax.[MPaxm/s] |
|---|---|
| 100 % | 0,08 |
| 50 % | 0,2 |
| 10 % | 0,4 |
| Faxial | Axial force |
| Ppermitted | Max. permitted surface pressure 5N/mm2 |
| preal | Actually occurring surface pressure for the selected size |
| Ae real | Effective support surface of the selected trapezoidal lead screw nut |
| P | Pitch |
| d1 | Pitch diameter |
| Mta | Drive torque [Nm] when converting a rotation - into a longitudinal movement |
| Mte | Drive torque [Nm] when converting a longitudinal movement into a rotary movement |
| v | Surface speed [m/s] |
| Øs | Feed rate [m/s] |
| n | Speed [min-1] |
| η | Efficiency |
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