LTB Specification

LTB – Rotary Table

LTB

Product type

  • Ready to install, perfectly suited for high precision movement

Characteristics

  • Rotary table for high precision movement and measuring
  • Complete with motor and CNC-control unit (optional)
  • Franke rotary tables of type LTB are open-center, ready-to- use positioning units. They are highly resilient, lightweight (aluminium housing) and deliver outstanding ATR accuracy and discrimination. Franke rotary tables of type LTB are versatile in use and are primarily suited to movement and positioning tasks in the fields of measurement, testing and orientation.

Diameter Range

  • From 120 and 400 mm

Material

Housing Aluminum corrugated
Ball race rings 54SiCr6
Rolling elements 100Cr6
Worm wheel wear-resistant bronze alloy
Worm shaft CK45N hardened and ground

Accuracies

Accuracies LTB125 LTB 175 LTB265 LTB400
Radial and axial runout accurancy   20 μm  20 μm  20 μm 30 μm
Positioning accuracy in arc seconds   80 sec  80 sec  70 sec 50 sec
Repeatability in arc seconds   16 sec  14 sec  10 sec 8 sec

Technical Details

Reduction ratio 360:1
Temperature in use –10 °C to +80 °C
Rotational speed max. 7 min -1
Mounting position any
Lubrication with bearing grease via grease nipples
Optional inductive proximity switch, flnage/coupling to mount the motor, motorisation

Please find additional information on bearing selection, calculation, mounting and setting in‘Technical information’.

LTB Drawing

Loadings

Please find additional information on bearing selection, calculation, mounting and setting in‘Technical information’.

Standard Cages

Strip cages for the LBK series

The band cage is segmented in the length required respectively and delivered fitted with balls and ready-to-use. The number of segments is dependent on the bearing diameter and the ball size. The band cage can also be created in one part for special applications.

Standard Cages

Special Cages

Flat cages made of hard fabric, non-corrosive steel, brass.

It is mandatory to use a flat cage for temperatures exceeding 100 °C and with ball diameters larger than 20 mm. Special solutions, including complete non-corrosive properties or radiation resistance, are also possible.

Special cages in the form of band or prong-type cages are available for special requirements in terms of ambient conditions or mounting space.

Franke also delivers materials such as plastic, non-corrosive, brass and Teflon.

Special Cages

Washers

Larger bearings and bearing elements use washers to simplify adjustment between the separate inner and outer rings. The washers are made of non-corrosive sheet steel. It is sensible to include in the design specifications a theoretical initial gap of 0.5 mm for the adjustment.

Washers

Washers

Seals

By standard, the bearing assemblies are fitted with sleeve seals S120. Temperature: –30 °C to +80 °C (NBR).
Max. circumferential speed: 5 m/s.

The seals can be ordered by the meter in order to seal the construction (e.g. when using a bearing element). The joint is then bonded using adhesive agent Loctite 401®.

Seals

Seals

Call us for more information on 01772 780200

Advantages

Maximum design freedom, without compromising precision or load capacity.

Principle

4 Point Contact

Freedom of Design

4 Point contact principle to take load from all directions. the rolling process does not take place directly between the rolling elements and the mating structure, but rather on special race rings, giving maximum freedom of design.

Compact

Minimal Mounting Space

Minimal Mounting Space

Requiring only a small mounting space, the compact and highly resilient four-point geometry of Franke Bearings gives you maximum freedom of design, making an ideal design component for your application.

Material

Unlimited Material Choice

Unlimited Material Choice

Franke lightweight aluminum bearings are 65% lighter than steel, offering substantial design freedom. Available in a wide range of materials, from aluminium, bronze ceramic, plastic, carbon, 3D printed and many more.

Bespoke

Built To Your Application

Built To Your Application

Available in sizes from 60 – 2000+ mm. 95% of our products are bespoke versions. Franke rotary solutions are always designed and built to fit your application. We work with you from concept, to prototype through to final testing.

Innovation In Motion

Do you have an application or invention that is in need of a bespoke bearing? We have been supporting engineers and inventors for over 70 years, helping to turn concepts and designs into reality. Get in touch to challenge us!
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