LTB Specification
LTB – Rotary Table
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.
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.
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.
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®.
Call us for more information on 01772 780200
Advantages
Maximum design freedom, without compromising precision or load capacity.
Principle
4 Point ContactFreedom 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 SpaceMinimal 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 ChoiceUnlimited 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 ApplicationBuilt 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.