Bearing Assemblies Type LDL Steel design Type LDL Aluminium design Type LDL Spur gear Type LDL Toothed belt gear Type LDV Steel design preference series Type LDH Steel design angular ball bearings
40 – 41 42 – 43 44 – 47 48 – 49 50 51
Standard Precise design
52 53 Rotary Tables
Rotary Tables Type LTA Type LTB
Bearing Elements Type LEL Ground design Type LED Double profile Type LER Rectangular profile Type LEG 2-ring bearing element Type LDD Slim bearing
Overview, Examples of Use, Advantages/Characteristics 20 – 29
54 – 55
Technical Information Bearing Elements Bearing Assemblies Rotary Tables Adjustment Values and Accuracy
56 – 58 58 – 60 60 61 – 62
Accessories Antifriction Bearings
Antifriction Bearings at a Glance Bearing Elements
• Round profile with ground raceway • Plastic cage with retained balls
• Double profile with ground or profiled raceway • Plastic cage with retained balls
• Rectangular profile with profiled raceway • Plastic cage with retained balls
• 2-ring bearing element with profiled raceway • Plastic cage with retained balls
• Special materials • Special rolling elements • Surface coatings • Special cages
• Surface coatings
• Surface coatings • Special cages
• High precision and smooth running • High load rating • Load rating and cross section can be adjusted individually
• Higher load capacity and smooth running thanks to ground raceway • Short delivery times • Reasonable alternative to type LEL
• Short delivery times • Very cost-effective thanks to competetive price, easy fitting and simplified finishing of the bearing bed • High stiffness • High load rating
• Smallest mounting space, as particularly compact • Easy fitting • Consists of just two race rings
• Individually adjustable to the application, therefore, suitable for almost all uses
• Standard line if series needed
• Maximum stiffness for diverse applications
• Replaces conventional deep groove ball bearings • Ideal for radial loads
Race ring diameter (mm) Standard Special
1.5 – 7 0.75 – 22
4 x 3
Ball diameter (mm) Standard Special
5 – 16 4 – 50
9.525 10, 12
Bearing cross section Standard (mm) Special
5.9 x 5.9 – 20.9 x 20.9 Customer’s choice
12.86 x 12.86 – 12.95 x 12.95 13.19 x 13.19 – 14.61 x 14.61
11 x 13
10.51 x 5
Ball pitch diameter (mm) Standard Special
70 – 2000 40 – 7000
100 – 1500
100 – 1500
100 – 500
More on page
30 – 33
34 – 35
• Slim bearing with ground raceway • Encapsulating steel housing
• Bearing assembly of steel or aluminium • Double-sided seal • With or without gear
• Bearing assembly of steel • One-sided seal • NEW with outer gear
• Special materials • Special rolling elements • Surface coatings • Gear to specifi cations
• Bearing assembly of steel as angular ball bearing
• Rotary Tables and positioning systems • Rotary Tables with gear and drive unit
• Inner to outer ring electrically insulated
• End switch • Rotary encoder • Motorisation • Steering • Measuring systems
• Easy fitting, as pre-finished bearing element • Bearing cross section in accordance with international standards
• Ready-to-connect complete bearing • With preload • High accuracy
• Ready-to-connect complete bearing • Available from stock • Competetive price
• High accuracy • Geometry, cross section, set-up of choice • Adjustment adjustable • Silent bearing for very quiet and low-vibration running
• Franke four-point bearing as basic component • Adaptors for customerspecific motors • Aluminium housing • High accuracy • High centre freedom
• Prefinished bearing element for diverse applications
• Individually adjustable to the application, therefore, suitable for almost all uses
• Individual adjustment to the application possible if series required
• For very dynamic applications • Individually adjustable to the application
• For diverse applications in industry and research
6 – 20
3/8” – 1”
5.125” – 26”
100 – 1500 Customer’s choice
200 – 600
21” – 41” Customer’s choice
100 – 400 Customer’s choice
38 – 39
40 – 49
52 – 53
Antifriction Bearings in Practice After in-depth consultation and precise design and production, Franke Antifriction Bearings provide movement in diverse applications. For example, in computer tomography, processing centres, textile machinery, machinery for chip production, indexing tables or robots. Our Antifriction Bearings pass the practical test day after day – you can rely on that.
In Medical Technology: Computer Tomography
In Solar Industries: Tracking Systems
Photo credit: Siemens AG
The patented Franke Fluesterlager ® as the main bearing in computer tomography contributes to exact x-rays thanks to its design tailor-made to the needs of medical technology.
The best possible positioning to the sun is required for photovoltaic modules or solar panels to obtain an optimum yield in solar energy systems. Franke Antifriction Bearings in tracking systems automatically align solar collector systems such that radiation from the sun is collected in ideal fashion.
The Features: • Smooth and low-vibration running is even ensured at high rotary speeds thanks to CNC-ground raceways. • The elastomer profiles between the race rings and the race ring bed form the basis for muted noise development and electrical insulation of the inner and outer ring. • The silent bearing impresses with rotary speeds of up to 300 revolutions per minute.
The Features: • The 4-point system of Franke Antifriction Bearings makes for optimum swivelling of solar collector systems along with a high degree of rigidity. • Built directly into the surrounding structure, these bearings are extremely space-saving. • Good value for money tops off the benefits of this Franke product.
Bearing diameter: 1500 mm
Bearing diameter: 170 mm
In the Textile Industry: Circular Knitting Machines
In Machinery: Machining Centres
Photo credit: Mayer & Cie. GmbH & Co.KG
Photo credit: Hermle AG
Our bearing elements for circular knitting machines have a decisive influence on the quality of the textiles due to their precision.
In tool changers at machining centres, our bearing assemblies help to ensure that different tools are fed quickly and precisely into the machining head.
The Features: • Even under severe thermal and mechanical loads, the bearing elements enable exact radial and axial guiding of the needles. • The rotary speeds are up to 60 revolutions per minute. • The quality of the machines is determined amongst other things by the quiet running of the bearing and the high surface quality of the raceways.
The Features: • Larger bore possibility of the bearing assemblies, the drive system can be installed to the inside. • Labyrinth seals protect the raceways of the bearing assemblies from chipping and coolants. • The preload of the bearing guarantees high accuracy and even adjustment – thus, nothing stands in the way of quiet running and maximum precision.
Bearing diameter: 960 mm
Bearing diameter: 970 mm
Antifriction Bearings in Practice
In Machinery: Indexing Tables
In Automation: Robots
By using indexing tables, also called Rotary Tables, tools are moved precisely. The constant and precise movement of these indexing tables is based on our bearing elements amongst other things.
Our bearing elements are ideally suited for use in the mobile axes of small robots.
The Features: • The bearing elements are precisely adjusted to the different loads. Enormous loads can easily be borne from all directions. • The Antifriction Bearings guarantee that the Rotary Table can move without jerks or shocks, high repeat accuracy is included.
The Features: • The ingenious 4-point system from Franke facilitates high capacity from all directions of movement. • As the bearing element is integrated into the existing robot design, only minimal installation space is needed. • The larger bore possibility of the bearing enables cables and supply pipes to be fed through.
Bearing diameter: 800 mm
Bearing diameter: 240 mm
In Clean Room Technology: In the Aviation Industry: Machinery for Chip Production Turbine Testing
Wafer steppers are used for microchip production in the clean room. The illumination optics form the heart of this machine. They produce the filigree chip structures. A component of the optics: a Franke Antifriction Bearing.
Franke Special Bearings of 700 to 1500 mm are used in testing stations for turbines. They are used to position the conducting segments and rotating blades. The bearings are integrated in precise housing contours to record the complex measuring and testing sensors.
The Features: • So that the illumination optics can work with extremely low tolerances, the bearing has good radial and axial accuracy and high stiffness. • Low-abrasion materials, special balls, a special ball cage and freedom from lubricants meet the necessary requirements for the clean room. • The final cleaning and packing of the bearing is effected for clean room level 10000. • Weight is saved by using aluminium.
The Features: • The bearings withstand temperatures up to 200 °C. • High accuracy requirements for radial and axial running are fulfilled. • The bearings can optionally be adjusted to all interface dimensions.
Bearing diameter: 138 mm
Bearing diameter: 850 mm
Bearing Elements – Advantages and Characteristics
4 race rings
Rolling element cage
The Characteristics: Race Rings The four race rings have a diameter of 1.5 to 7 mm as standard. The special diameters are 0.75 to 22 mm. Different race ring diameters can be combined with different ball diameters.
Rolling Elements The standard steel rolling elements correspond to DIN 5401, G28. They are matched in tolerance and grade. Grades up to G3 are available for high accuracy applications.
The raceway of the ring is optimally adjusted to the diameter of the rolling element in its osculation. Osculation and angle support of the race ring are individually specified and are determined by the installation situation.
You can choose between rolling elements of non-corrosive, non-magnetic steel or ceramics for special cases.
The raceway surface is either ground or drawn. Ground surfaces provide the highest precision and smoothest running. However, Franke also offers unground ball race rings. There are several race ring profiles to choose from (see p. 30 – 39).
For particularly high requirements with regard to load rating and stiffness, Franke prefinished bearing assemblies with rollers as cross roller bearings are suitable.
> The Franke principle as a film:
• Direct integration of the bearing in the application • Minimum space needed thanks to compact design and low bearing cross section • Acceptance of loads from all directions thanks to four-point geometry • Best radial and axial accuracy • High running performance and capacity thanks to raceways precisely adjusted to the ball diameters • Shock-resistant thanks to internal elasticity • Rotational resistance freely adjustable
Segmented Rolling Element Cage The plastic cage holds the rolling elements in the predetermined position, facilitates fitting and reduces friction. The running is improved and less lubricant is needed. Segmenting in equally long sections is oriented by the bearing diameter. It guarantees silent running. Sufficient clearance for thermal expansion is also guaranteed. The expansion depends, amongst other things, on the ball or ball pitch diameter. For special cases, e.g. heavy soiling and temperatures above 120 °C, flat cages of brass or non-corrosive are available.
Housing Design The race rings provide the necessary stiffness and precision of the bearing as far as possible. They bear the main load. The possibilities are endless for designing the connecting design. The encapsulating design is not directly exposed to the demands of the rolling elements. Thus, steel, cast iron, aluminium, noncorrosive, bronze, compounds or plastic can be used for the design. The weight saving is up to 65 % depending on the material chosen. The result: a component with high quality mounting, which matches a conventional steel bearing in running performance, capacity and precision and is precisely adjusted to the application.
Seal Seals can be ordered as bulk stock for sealing the design. Viton seals are available for high temperatures or aggressive media.
Bearing Assemblies – Advantages and Characteristics
Franke bearing element
The Characteristics: Bearing Element The integrated bearing element comprises four race rings and a plastic cage with retained balls. Depending on the application of the bearing assembly, the bearing element is designed as a conventional four-point bearing, radial or axial bearing. For special applications, such as main bearings for computer tomographs, there are double row angular bearings of various designs. The performance of the bearing assembly is decisively influenced by the bearing element used. The right bearing element is chosen according to the requirements of the bearing assembly. Depending on the application and the load situation, bearing elements of the type LEL with ground raceway or LED type or LER with profiled raceway are used. In addition to the standard ranges, various special combinations of race ring cross sections and rolling element diameters are possible, to meet the requirements of your individual application.
Outer and Inner Ring (toothed on request) The solid outer and inner rings enclose the bearing element They are designed with ready-to-mount bore shape and a standard adjustment (see p. 61 – 62 for more details on setting the adjustment). Outer and inner rings are available in three standard bore shapes: Bore shape A Bore shape B Bore shape C
Other bore shapes on request. Outer and inner ring can be equipped with gear on request. The standard gear corresponds to DIN 3967 in quality 8e25 basic profile DIN 867. All standard and special gears are, of course, part of the Franke range.
The Advantages: • Customer-specific special bearing • Free choice of material, aluminium version 65 % lighter than steel design • Individually adjusted bore shape for direct incorporation into the construction • Integrated Franke bearing element for loads from all directions, high performance and precision • High dynamic, maximum peripheral speed up to 20 m/s
Seal A lip seal is a standard component of Franke bearing assemblies. Both sides are sealed on the LDL type. The LDV type has a one-sided seal.
Adjustment Franke bearing assemblies are preloaded and free from clearance. The rotational resistance can be adjusted to the customer’s requirements on request.
We recommend viton seals for applications at high temperatures or for aggressive media.
Setting using washers is the most flexible method, as this still allows readjustment of the adjustment later on.
Special bearing assemblies can be adjusted to requirements. All seal variations are available here.
When setting using solid adjustment, the adjustment surface is brought to the correct level by subsequent grinding. The advantage of this method is the high accuracy. Adjusting using a ring nut is the cost-effective alternative. A screw thread is inserted in the divided inner or outer ring for this method. An adjusting ring can be turned to the desired preload using the thread.
Bearing Elements Type LEL
LEL 1.5/5 Ø KK mm 70 80 90 100 110 120 130 140 150
2 x 10 2 x 12 3 x 15 3 x 16 3 x 18 4 x 20 5 x 26 6 x 31 8 x 38 8 x 45 12 x 56 15 x 80
2.7 x 13 2.7 x 15 4.0 x 18 4.0 x 18 4.0 x 20 5.5 x 23 6.5 x 30 7.5 x 35 10.0 x 43 10.0 x 50 14.0 x 61 17.5 x 88
Material: laminated cloth, brass, non-corrosive
Strip cages of laminated cloth, non-corrosive, brass
Use of a flat cage is mandatory at temperatures over 100 °C and for ball diameters greater than 20 mm. Special solutions, such as complete corrosion protection or radiation adjustment, are also available. Special cages in the form of strip or comb cages are available for special applications with regard to environmental influences or mounting space requirements. Franke offers materials like plastic, non-corrosive steel, brass, Teflon etc.
Washers Size a
Adjustment between the divided inner or outer rings is simplified by washers for larger bearings or bearing elements. The washers are made of non-corrosive sheet steel. A theoretical begin column of 0.5 mm is recommended in the construction design for adjustment.
M 6 M 8 M 10 M 12 M 16
Dimensions mm b d
11.0 14.7 16.4 20.3 25.4
24.4 34.2 42.3 46.0 54.0
7 9 11 13 17
5 6 7 8 11
11.0 13.5 16.0 18.0 24.0
Order no. Gauge 0.025 0.1 0.15 0.2 0.25 0.3 0.5 1.0 mm M 6 79015A 79034A 79035A 79036A 79037A 79038A 79039A 79040A M 8 79041A 79023A 79042A 79000A 79026A 79043A 79044A 79045A M 10 79046A 79012A 79010A 79011A 79047A 79048A 79049A 79050A M 12 79118A 79051A 79052A 79053A 79054A 79055A 79056A 79065A M 16 79119A 79024A 79066A 79057A 79058A 79059A 79060A 79061A
Seals The bearing assemblies are equipped with the S10 collar seal as standard. Temperature: –30 °C to +80 °C (NBR). Max. peripheral speed: 5 m/s.
Profile S 1
10 10 15
H 4.2 4.2 5.5
Dimensions Material mm B1±0.2 D B ±0.3 5.3 5.3 8.5
3.0 3.0 4.3
0.8 0.8 1.0
Preload mm VL1
Perbunan 70NBR/221 Viton Perbunan 70NBR/221
0.5…1.5 0.5…1.5 0.5…2.0
09080 46062 09190
0.026 0.026 0.051
depending on bearing assembly (approx. 1 Nm/m seal)
Installation Dimensions Profile Installation dimensions mm S c c2 a1
Groove dimension mm s +0.1 t+0.2 4.2 5.5
Important note: measure seal first, then make groove.
Special seals are available on request. Franke offers Viton seals for high temperatures or aggressive media.
For sealing the construction (e.g. for use as a bearing element) seals can be ordered as bulk stock. The point of impact is then glued with the adhesive Loctite 401®.
1 Choice of Antifriction Bearings It is best to select and size the bearing before design begins.
on. You can order the washers by screw diameter in different thicknesses (see accessories p. 55).
1.1 Parameters for Choosing Bearings • Permitted dimensions and material information of the bearing. • Loads with load spectrums and associated time slices in %. • Rotary speed and number of rotating motions and rotating angle per time unit. • Peripheral forces to be borne by the gear. • Other operating conditions, such as temperature, vacuum, clean room, moisture ...
Requirements: • Spacing of the inner or outer design. • The height of the race ring bed is 0.3 to 0.5 mm smaller on the side of the divided mating structure. This gap is needed to insert the washers. • The divided side of the mating structure should be fixed with a centering collar. This is the only way to guarantee the parallelism. Installation and set-up:
An approximate choice of bearing is possible using the catalogue. All relevant data are to be found on the pages for the individual types. 1.2 Static and Dynamic Load Capacity, Calculation The figures given in the catalogue for the static and dynamic load ratings are for a preliminary design, but are insufficient for exact sizing. The load ratings given correspond to the radial load ratings. Exact sizing requires the static axial, radial and torque load ratings and the dynamic axial and radial load ratings. The axial values are approximately higher by a factor of 2. Franke will perform the calculation on request.
2 Installation and Set-Up of Bearing Elements
Bearing elements consist of two inner and two outer race rings and a multipart, segmented cage with balls. The race rings are divided and can, thus, be used flexibly in the diameter for installation. The balls correspond to quality grade 3 (DIN 5401). Only the supplied balls may be used. If balls are lost, all the balls must be exchanged to ensure the race characteristics of the bearing are not impaired. Setting the preload is an important requirement for a long lifetime. This guarantees that all raceways are sharing the load and the balls are running perfectly in the predetermined positions.
The race rings are laid in the mating structure. The race ring beds can be greased to hold the race rings in position during installation. The points of impact of the opposite race rings in the same section, are installed at an angle of approx. 180°. Afterwards, the divided side of the mating structure is brought to the intended position.* Then, you insert the cage segments with the balls and grease the bearing element (see 4.1 Lubrication). Before the mating structure of the divided side is closed, arrange the washers on the screw borings of the holding screws. The thickness depends on the in-built gap (see above). Once the screws are tightened (see 4.5 Screws) and the bearing assemblies have been turned about 2 to 3 times through 360°, check the adjustment. If the values differ by more than 5 to 10 %, the thickness of all washers must be changed and the process repeated. *Applies for both installation methods 2.1 and 2.2 2.2 Setting through Massive Adjustment
2.1 Setting with Washers Setting using washers is the most cost-effective and flexible method, as this still allows readjustment of the adjustment later
When setting using massive adjustment, the adjustment surface is brought to the correct level by subsequent grinding. The best accuracy is achieved with this method, as the joint face
3 Installation and Set-Up of Slim Bearings between the divided side of the mating structure is form-fit and no tension bridges can build up. Requirement: • Spacing of the inner or outer design. • Surface grinding machine of suitable size. • The height of the race ring bed is 0.1 mm larger on the side of the divided mating structure. This oversize is necessary for the adjustment. • The divided side of the mating structure should be fixed with a centering collar. This determines the parallelism of the two raceways.
Slim bearings of the LDD type are highly loadable, pre-finished bearing elements, which can be fitted very easily in a small installation space. With slim bearings the bearing element (four ball race rings with ground raceway and a plastic band cage with retained balls) is embedded in a steel inner and outer casing. The casings are peripherally divided and form a pre-finished bearing, which is integrated directly in each design. In contrast to standard, closed and ground slim bearings, the play on Franke slim bearings is not dependent on the fit of the outer and inner rings. As a result, fitting and removing are easier and require no special tools or thermal treatment.
Installation and set-up: The bearings are suitable for permanent operation at temperatures between –10 °C and +70 °C – and briefly for use up to +120 °C. Peripheral speeds of 10 m/s with fat lubrication and 12 m/s with oil lubrication can be achieved. Setting the preload is an important requirement for a long lifetime of the slim bearing. This guarantees that all raceways are sharing the load and the balls are running perfectly in their predetermined positions. The preload is set correctly when the adjustment corresponds to the values in the diagram at point 6 without seal.
To ensure the parallelism is maintained between this surface and the raceway, a suitable bearing surface should already be chosen during design. After thorough removal of the ground dust, the ring is refitted as described and the bearing moves. Then check the adjustment. If this value differs by more than 5 to 10 %, the procedure must be repeated. Finally, the bearing assembly is greased via the in-built grease borings (see 4.1 Lubrication).
Note: Setting the preload is advisable, as there tolerances that need to be compensated even with the best production. 3.1 Settings with Washers Setting using washers is the most cost-effective and flexible method, as this still allows readjustment of the adjustment later on. You can order the washers by screw diameter in different thicknesses (see accessories p. 55). Requirements: • Spacing of the inner or outer design. • The height of the race ring bed is 0.3 to 0.5 mm smaller on the side of the divided mating structure. This gap is needed to the insert the washers. • The divided side of the mating structure can be fixed with a centering collar to improve the parallelism of the raceways.
Note: Setting the preload is advisable, as there are tolerances that need to be compensated even with the best production.
Then insert the cage segments with the balls and close the bearing assembly with the two divided sides of the mating structure (adjustment ring). Once the screws have been tightened properly (see 4.5 Screws) and the bearing assembly has been turned 2 to 3 times through 360°, measure the space between the inner and outer ring using a test gauge. Then the adjustment ring is taken off again and the determined value plus 0.02 to 0.03 mm is ground off with the grinding machine.
Installation suggestion A:
The slim bearing is laid in the mating structure. Before the mating structure of the divided side is closed, arrange the washers on the screw borings of the holding screws. The thickness depends on the in-built gap (see above). Once the screws are tightened (see 4.5 Screws) and the bearing assemblies have been turned about 2 to 3 times through 360°, check the adjustment. If the values differ by more than 5 to 10 %, the thickness of all washers must be changed and the process repeated. 3.2 Setting through Massive Adjustment
When setting using massive adjustment, the adjustment surface is brought to the correct level by subsequent grinding. The best accuracy is achieved with this method, as the joint face between the divided side of the mating structure is form-fit and no tension bridges can build up. Requirement: • Spacing of the inner or outer design. • Surface grinding machine of suitable size. • The height of the wire ring bed is 0.1 mm larger on the side of the divided mating structure. This oversize is necessary for the adjustment. • The divided side of the mating structure can be fixed with a centering collar. In this way the parallelism of the two raceways is improved. Installation and set-up:
The slim bearing is inserted into the mating structure and the bearing is closed with the two divided sides of the mating structure (adjustment ring). Once the screws have been tightened properly (see 4.5 Screws) and the bearing has been turned 2 to 3 times through 360°, measure the space between the inner and outer ring using a test gauge. Then the adjustment ring is taken off again and the determined value plus 0.02 to 0.03 mm is ground off with the grinding machine. To ensure the parallelism is maintained between this surface and the raceway, a suitable bearing surface should already be chosen during design. After thorough removal of the ground dust, the ring is refitted as described and the bearing moves. Then check the adjustment. If this value differs by more than 5 to 10 %, the procedure must be repeated.
4 Installation and Set-Up of Bearing Assemblies Franke bearing assemblies are pre-finished complete bearings – regardless of whether they are standard bearings from the catalogue or a customer-specific version. The preset or defined race accuracy, adjustment, stiffness and general characteristics are dependent on the mating structure and on the accuracy or completeness of the data supplied. Therefore, particular attention must be paid. 4.1 Lubrication and Maintenance To keep friction low and to protect the bearing from corrosion in the long run, ensure use of sufficient lubrication. All lubricants undergo an ageing process, which limits the service life. The best ageing stability is achieved with fully synthetic lubricants. ISOFLEX TOPAS NCA52 (special grease from Klüber, designation in accordance with DIN 51502: KHC2 N-50) is used as the initial lubrication on Franke bearings. The ageing stability of this lubricant is for approx. three years. This lubricant is also recommended for the use of bearing elements. High quality lithium soap fats based on polyalpha-olefin or mineral oils and in accordance with DIN 51825-K2 K-40 are suitable as an alternative. Questions on lubricants, such as miscibility, aggressiveness, extreme temperatures, removal, areas of use etc., must be clarified with the relevant lubricant manufacturer. 4.2 First or Relubrication The amount of lubricant that an Antifriction Bearing needs for lubrication is relatively low and is dependent on the rotary speed. Because of the flexing work, too much lubricant causes increased temperatures, which limit or prevent lubricity. The
bearing’s lifetime is substantially reduced due to the increased wear. The amount of lubricant is determined by the calculated play inside the bearing assembly. The calculated volume must be filled with 20 to 30 % lubricant. The recommendation is 30 to 40 % for slewing bearings.
Calculation example: bearing assembly of type LDL, Ø KK 500 mm, order no. 73105Y Peripheral speed 3 m/s Operating time approx. 16 hrs/day
4.3 Relubrication and Lubrication Periods
Relubrication period for 3 m/s is 1000 hrs (see table 1) = 1000 (hrs) / 16 (hrs/day) = 63 days ~ 3 months for 16 hrs/day operating time
The lubricity reduces due to mechanical loads and ageing. Therefore, it is necessary to supplement or completely replace the existing lubricant (e.g. in the event of heavy soiling). The bearing must be rotated during relubrication. Relubrication should be effected at operating temperatures as far as possible.
Relubrication should be effected quarterly. The X factor (table 2) is rounded off and is 0.003. The h2 measurement is 42 mm (see catalogue page 40). m = 500 mm x 42/3 mm-1 x 0.003 g = 21 g
The amounts for relubrication are calculated as follows: m = Ø KK x h2/3 x X h2 = bearing ring height in mm Ø KK = ball pitch diameter in mm m = amount of lubricant in g X = factor according to table 1 in mm-1
Thus, relubrication of 21 g of ISOFLEX TOPAS NCA52 should be applied every three months. The lubricant has a shelf life of three years. 4.4 Lubrication and Lubrication Periods for the Gear
Relubrication periods: Exact determination of the periods is usage-specific and, therefore, can only be correctly determined by trial and error (guide values see table 1). To determine the X factor (table 2), use the read time value in reference to the operating time of the application.
Automatic gear lubrication is recommended. With manual lubrication, the gear and the pinion must be sufficiently lubricated before start-up. The lubrication period depends on the design and peripheral speed and, therefore, must be determined individually. 4.5 Screws
0 to < 3 3 to < 5 5 to < 8 3 to <10
5000 1000 600 200
Table 1: Relubrication Periods Frequency X
2-3 years 0.005
Table 2: Relubrication Intervals
Circular oil lubrication is possible in principle and should be discussed with the relevant lubricant manufacturer. Lubricantfree bearings are available for special applications (e.g. clean room or ultrahigh vacuum).
The number of screws and the diameter for fixing to the mating structure should be checked in principle. The spacing X from holding screw to holding screw should not exceed 125 mm to avoid formation of bridges. The fixing screws are tightened crosswise with a torque wrench in relation to the screw quality – according to the figures in table 3.
10 25 49 86 210
17 41 83 145 355
M6 M8 M10 M12 M16
Note: for standard bearings applying one lubrication application is sufficient, as the lubricant is evenly distributed by the bearing rotation. For slewing bearings at least three relubrication applications are needed (3x120°).
Table 3: Starting Torque
The screws need to be retightened with the prescribed tighten ing moment to resolve settling phenomena. This process should be effected as far as possible when the screws are free of additional forces. They must be checked after around
5 Rotary Tables 100 and then every 600 operating hours. This period can also be much shorter for special applications (e.g. heavy vibrations). 4.6 Gear Franke supplies straight gear without hardening as standard (material 42CrMo4V) and special gears on request. The material, design and quality can be changed at any time on request. The catalogue figures with regard to permitted peripheral forces were determined using the permitted bending stress in the tooth foot. The maximum forces relate to extreme loads, which occur in the event of brief impact loads such as starting and braking. These values are for guidance purposes only and can only be determined through a gear calculation, including both components pinion and bearing assembly.
5.1 Load Capacity The recommended safety for Franke Rotary Tables is SST ≥ 3 for simple loading and SST ≥ 6 for dynamically changing loading and lifting. Franke will perform calculations on loading and lifetime on request. 5.2 Temperature Range The Rotary Tables can be used at an operating temperature of –10 °C to + 80 °C . Expanded temperature ranges are possible on request.
4.7 Tolerance and Accuracy All tolerances and accuracies are given on the relevant page of the catalogue. The greatest possible accuracy is achieved when the constructive design of the encapsulating parts is effected in such a way that machining of all related diameters and surfaces can be performed in a clamp.
The run accuracy values in the catalogue are maximum values and can be improved further by limiting the tolerances.
In general, all standard Rotary Tables ex works have long-term lubrication with the Antifriction Bearing grease Isoflex Tops NCA52. It is recommended that Franke Rotary Tables – depending on usage – are relubricated twice a year to once a year (see also 4.1 Lubrication and maintenance).
The tolerance values T = IT6 or T = IT7 relate to the diameterdependent basic tolerances in accordance with DIN ISO 286 see table 4).
Nominal size range mm over … to
Franke Rotary Tables have a high load capacity and are ideally suited for assembly, measuring and inspecting tasks. All Rotary Tables have a compact aluminium housing with integrated Franke components. A worm gear pair guarantees high accuracy also for permanent loading. The Rotary Tables are extremely tip-resistant with a low own weight. Precise technical details are on the relevant pages in the catalogue.
35 40 46 52 57 63 70 80 90 105 125 DIN ISO 286 T1 (11.90)
LTA100 LTA200 LTB125 LTB175 LTB265 LTB400
Relubrication amount per lubrication point g front side 1 1 3 3 3 1
5.4 Options • One or two inductive proximity switches, integrated inside the table • Freely positionable trips • Adaptor sets for motors at customer’s request • Motorisation depending on application with step or servo motors • Rotary encoder on the second shaft extension of the worm shaft • Complete automation solutions Please follow assembly and maintenance instructions. They are included with every delivery.
6 Adjustment Values and Accuracy The adjustment gives information on the preload of the bearing assembly. It depends on the individual type and the rolling circle (see 6. Adjustments of individual types). However, these values are not definitive and, therefore, can be adjusted individually depending on the application. The stiffness is indirectly related to the adjustment. The rule of thumb: the higher the adjustment, the higher the stiffness. The adjustment increase by the seal S10 (see Accessories page 55) amounts to approx. 1 Nm/m circumference and sealing side. This value can fluctuate depending on dry running or surface quality. Adjustments bearing elements