Basic design / Materials

The cold-rolled Carry Speed-line ball screw features an extremely high pitch. Designed to meet customer demand for a wear-free high-helix ball screw, it delivers a high transmission speed and an impressive efficiency.
Ball screws of the Carry Speed-line are the product of the very economical coldrolling process. They combine with single steel nuts produced in a unique specially developed process.

The design and production of this high-helix ball screw derive from our experience in making the Carry and Speedy screws. In other words, the Carry Speed-line integrates the know-how of both technologies.

Carry Speed-line offers all the advantages of the inherent ball screw design:
– high efficiency, i.e.
- low power input
- low self-heating
– low frictional, stick-slip-free running
– maximum wear resistance, i.e. very good repetition accuracy with a constant positioning precision
– high reliability and durability

Materials

Screws as well as nuts are made of hardened steel. Stainless steel upon request (please ask for load rates).
Nut end caps with integrated ball returns and wipers are made of plastic.

Ball return

Nuts feature end cap ball returns, fully integrated into the nut shape and serving as wipers.

Lead accuracy

Eichenberger high-helix ball screws feature the following lead accuracies according to DIN 69051:

Standard
• G9 = ≤ 0,1 mm/300 mm

On request
up to max. 1200 mm screw length
• G7 = ≤ 0,052 mm/300 mm
• G5 = ≤ 0,023 mm/300 mm

Efficiency

The efficiency h for this Carry Speed-line is an impressive 0.95.

Lubrication

The usual specifications for lubricating ball bearings also apply to ball screws.However, lubrication applied only once but intended to last a lifetime is not sufficient in most cases. Regular lubricationis required to extend the service life of theball screw.

Please note:
When shipped, screws simply have a protective film. Before mounting or operating the ball screw, units must be lubricated with the proper lubricant (through the lube hole for nuts with wipers; directly onto the screw for nuts without wipers).

Recommended all-purpose lubricant:
– Klüber Microlube GBU Y 131

When using another lubricant, please verify compatibility with anticorrosion agent; otherwise rinse ball screw unit prior to lubrication.

Caution:
Do not use grease containing graphite or MoS.

Ball screw ends

Ball screw ends are without any machining cut by grinding (standard).
Upon request, a so-called standard screw end journal with three turned bearing seats (see figure below) is available. Dimensions are as per customer specifications.
Screws may also be ordered with softened ends for subsequent finishing by the customer or with an application-specific end journal.
In each instance, a detailed drawing would be necessary.

Note also the links to the CAD data.

Radial loads and torque

Radial loads or torque brought to bear upon the nut result in overload of individual contact surfaces, thus seriously affecting the service life of the ball screw assembly. Therefore it is important to properly mount the screw and to comply with all relevant form and positional tolerances.

Assembling

Remove transport lock (O-ring) on one side. Please keep sleeve and nut in horizontal position. Otherwise, the nut may slide from the sleeve and balls may fall out of the ball race.
In the event such incident does occur, balls must be properly re-inserted to prevent damage to or blockage of the ball screw. If in doubt, please contact Eichenberger Gewinde AG.

Insert screw end into mounting sleeve.

Caution: Operator must be able to advance sleeve up to the thread intake. Otherwise, balls may fall out of the ball race and damage or block the unit.

Gently turn nut onto the screw.