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dryspin lead screw technology | Introduction dryspin lead screw technology | Technical terms
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General definition of a lead screw drive
dryspin lead screw technology
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The dryspin lead screw technology includes a wide product range of shapes and dimensions for Outer diameter: Outer diameter
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lubrication-free and maintenance-free lead screw drives, with pitches between 0.5 and 100mm. The distance between the outermost edges of the opposite
Pitch diameter
lead screw flanks is called the lead screw outer diameter, Core diameter
These include: i.e. it is the largest possible diameter on the lead screw.
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● dryspin threads and high helix threads with optimised The outer diameter is also known as the nominal diameter. Thread
geometry
thread profile
● Metric thread according to DIN 976 Core diameter: Thread flank
● Trapezoidal thread according to DIN 103 The distance between the base of the lead screw, i.e. the
Thread
● American ACME threads according to ANSI/SME B1.5 lowest point, and the opposite base of the lead screw gives groove
the core diameter. This means it is the smallest diameter
In addition to the freedom from maintenance and lubrication, use of different tribologically optimised materials enables on the lead screw. Pitch
the main focus is always the insensitivity to external influences lead screw technology to meet many required specifications, Flank angle
such as dirt, water, chemicals or impact loads. A dryspin e.g. withstanding high loads, temperature resistance or Pitch diameter:
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lead screw drive consists of a metallic lead screw made of FDA conformity. In addition to a large selection of standard The distance perpendicular to the axis between two
steel, stainless steel or aluminium and a lead screw nut made materials for the lead screw technology, igus also offers opposite flanks, or the space between the profile centre Thread depth
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of tribologically optimised iglidur high-performance polymers. a large number of variants in the lead screw nut geometry lines, is called pitch diameter.
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There are seven different standard materials available for itself. Moreover, lead screw nuts made by injection moulding
different purposes: iglidur J, iglidur J350, iglidur A180, or machined from iglidur bar stock have already been able Thread flank: Manufacturing processes:
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iglidur E7, iglidur R, iglidur J200 and iglidur W300. The to improve many applications. The flank results from the extension of the line from the The thread rolling is a non-cutting manufacturing process
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lead screw base to the tooth flanks or to the end of the that, according to DIN 8580, belongs to the forming
profile centre line. manufacturing process. The thread is rolled into the surface
of the raw material by cold forming. The forming is generated
Flank angle: by compressive stress of the tool on the workpiece. Cold
The flank angle is present on all lead screws. It describes forming achieves a high surface quality and high strength.
the angle from one flank of the lead screw to the other. For large quantities of rolled sold by the metre products,
the production process is faster and more cost-effective
Pitch: than the "thread whirling" production process.
The pitch describes the distance, measured parallel to the
axis, between two adjacent and parallel flanks of the same Benefits:
lead screw. It thus indicates in mm the linear travel per ● Rounded thread flank tips
revolution of the lead screw. In contrast to a metric or a ● High surface quality, high strength
trapezoidal lead screw, the high helix lead screw has a ● Producibility of multi start threads with high pitches
high pitch. The high helix lead screw can convert a small
radial movement into a relatively large axial movement with
one revolution.
Rolled thread
Thread pitch:
The full circumference of the helical curve of a lead screw.

Manufacturing tolerances:
Trapezoidal threads are manufactured according to DIN
103, metric lead screws according to DIN 976 and the
dryspin high helix and plain lead screws with an outer Diameter of the Large thread
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diameter tolerance of -0.1mm. raw material diameter

ASEAN 09/2023 ASEAN 09/2023

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