we have to use other bearings bearings suppliers

In selecting suitable for installation in the fold hinge taper roller bearing rolling elements supporting the internal, the Schaeffler UK company and its customers Street CraneXpress Ltd has worked closely, the company is a mechanical processing company located in Sheffield. Street CraneXpress Ltd company responsible for the design, manufacture and installation of roof can be opened for all mechanical and electrical components.

Street CraneXpress project manager Daniel Salthouse roof at Wimbledon working on the project more than five years. He commented, "In the past, we have to use other bearing manufacturer bearings suppliers, but on this project, we decided to collaborate and Schaeffler UK companies, because we are the company in similar projects, such as the London Eye and the temperature Bourdon stadiums and other projects to provide excellent technical support, as well as in the selection and supply bearings expertise impressed. "

"When 15,000 people sitting in the center court area, we may encounter unpredictable winds and other weather conditions, bearing on the open roof support is critical. Safety, reliability, low maintenance requirements of this project is particularly important. bearing life of 20 years to 25 years between the bearing grease lubricated to ensure easy maintenance and has a long service life. "Salthouse added.

Salthouse said Mr. Schaeffler UK technical support bearing mounting typical example is to provide guidance. "Schaeffler UK engineers provide comprehensive advice and guidance, greatly accelerated the assembly process." Salthouse said.

Large heavy rotary table smooth off the assembly line

New Year began, Yantai Universal Bearing manufacturer ool Accessory Group independently developed specifically for large heavy-duty CNC Boring and Milling tailored TK832500 × 3000 CNC rotary table coordinate smoothly downline sent to the user.
This product by the bed, sliding seat, table composed of three parts, loads up to 40 tons, the whole closed-loop control. Bed fixed on the foundation and supporting the slide and the table, slide straight direction to do a quick feed table can shift the circumferential direction in the B-axis rotary feed, precision indexing, locking at any angle. It can be completed with the host large heavy workpieces of different angles boring and milling machining can also be under the control of the control system for interpolation, circular surface finish, surface processing.
At present the domestic OEMs are committed to the development can be processed nuclear power, wind power, large ships, high-speed rail and other industries in large and giant piece of heavy-duty CNC milling and boring machine large, one of the key features of CNC coordinate rotary table, there is a large market development. Yantai Universal Machine Tool Accessory Group is to seize the initiative in this area, bigger and stronger, to revitalize the equipment manufacturing industry to make contributions.
   In April Nanjing CNC Machine Tool Show, Yantai Global Group will showcase more than 50 kinds of products, including for domestic high-end CNC lathes and milling machining centers supporting the power turret and servo turret, and great market potential high value-added products TK62500 direct-drive turntable

the spindle that are not synchronized to the rotational speed.

Machine structure and spindle speed resonance
  (Resonant conditions of the machine structure that are synchronized with the rotational speed).
Causing radial synchronization error (Asynchronous Error) reasons:

1 bearing preload improper (Improper preload).

2 Defective Precision bearing (Bearing defects) such as:

 Ball or roller size differences or defects (Size variation or defects in rolling elements.).

 balls or rollers and the track surface friction (Defects such as galling of rotating race).

 retainer deformation or wear poorly assembled. (bearing manufacturer cages - worn or installed improperly)

3 machine structural deformation caused by relative vibration (Structural Motion relative vibration).
4 by an external source of vibration machine vibration caused by structural deformation (Conducted vibration from the floor that caused motion between the probe and master target.).

5 machine internal vibration source (Self excited motion) caused by:

Hydraulic systems (Hydraulic system)
 Cooling system (Coolant system)
gears, belts and pulleys (Gears, belts, pulleys)
Lubrication Systems (Lubrication systems)

6 of resonant mechanical structure or spindle (Resonant frequencies of the machine elements including the spindle that are not synchronized to the rotational speed.).

Dynamic spindle rotation accuracy test description

Dynamic analysis of spindle rotation accuracy
Causing radial error motion (Radial Error Motion) reasons:
There are two main causes of the spindle on the machine tool precision error:
1 Bearings (Bearings), contains the bearing does not mind (bearing alignment).
(2) structural deformation caused by the machine spindle and measurement points of the dynamic displacement (Structural motion between where the probe is mounted and the spindle.).
Causing radial average error (Average Error) reasons:
bearing inner (outer) ring orbit is not round (Out of round stationary bearing races).
bearing manufactureris not round (Out of round bearing seats).
bearing does not mind (Misaligned bearing seats).
spindle dynamic imbalance coupled structural rigidity uneven (Out of Balance condition coupled with non-uniform), (Ie a structure that is weak in one direction).

Measurement precision spindle

Spindle error motion measurement and research purposes
On the spindle error motion measurement and research has two Precision bearing:
From the design, manufacturing point of view, I hope to find out by measuring the study design, manufacturing factors and the relationship between the spindle error motion, and how the error motion characteristics, evaluation of the spindle system design and manufacturing quality, and find out the error of movement of the main reason for further improvement.
From the use of perspective, hoping to find the spindle movement and machining accuracy and surface roughness relationship and how the error motion characteristics, predict machine tools under ideal conditions can machined workpiece geometry and surface roughness, giving selection of machine tools and machine tools made in accordance with the design.
Spindle rotation accuracy of testing methods
Spindle rotation accuracy of the measurement method, there are direct and indirect measurement bearing manufacturer (specimen France) two categories, which have a direct measurement of static and dynamic measurements in two ways.
Static test method -
Insert the spindle taper hole precision of the test rod, test bars in contact with the surface of the scale and face, gently rotating spindle measurements at different angles on the readings. Advantages: measuring method is simple, easy to operate, it can be tested with the rotary spindle taper hole centerline centerline are concentric; Disadvantages: does not reflect the actual operating speed spindle error motion, and does not reflect the movement may cause processing errors form error and the surface roughness.
Dynamic test method -
Eccentrically mounted on standard test bars, in two mutually perpendicular radial fixed displacement sensor, and then install a vertical axial direction, the other displacement sensor, the signal input to the oscilloscope via an amplifier to measure the direction of rotation of the spindle error motion sensitive.
Motion error Figure Glossary
Total error motion (Total Error Motion) - more than enough laps to record all errors polar plots, which represents the main average error motion (Average Error Motion) - is the total error motion polar plot of the average contour, on behalf of the aircraft station ideal cutting conditions can best machined parts roundness. Random error motion (Asynchronous Error Motion) - is the total error of the mean error motion movement deviation, which represents the ideal cutting conditions can obtain surface roughness.
Basic error (Fundamental Error) - The average error motion of the closest circle, on behalf of spindle axis once per revolution axial errors.
Residual error (Residual Error) - The average error motion picture of the basic error of the deviation, on behalf of the plane of the end face machining

Dynamic spindle rotation accuracy test introduced

 Precision machine tool spindle assembly consists of the following two ways: 1. Geometric accuracy - geometric precision spindle assembly, is assembled in the no-load low speed rotation (mechanical speed or low speed rotation by hand) under the conditions of the spindle axis and spindle front mounting workpiece or tool parts of the radial and axial runout, and when the spindle of a reference system (such as a knife or table vertical and horizontal bearing manufacturer direction) position accuracy, such as parallelism and verticality; 2. rotational accuracy - refers to a spindle made ​​at normal working speed rotary motion, the axis of the position changes.
Second, the definition of spindle rotation accuracy
When the spindle for rotational movement, at the same moment, the spindle speed is zero on the line connection points, called a rotary shaft center line of the moment, under ideal conditions, the rotation of the spindle at each instant the spatial position of the center line, with respect to a fixed reference system (example: turret, spindle machine tool box or work surface), it should be fixed. In practice, as the spindle journalled in the bearing, the bearing housing and the hole in the spindle, the spindle and gears or other transmission parts, non-circularity of the journal, the bearing defect, the support side facing the shaft the neck is not perpendicular to the center line of the spindle machine tool deflection and causes resonance structure, the spatial position of spindle centerline, at each instant is variable. These moments of the rotary spindle rotation centerline position is defined as the average space ideal for rotary spindle centerline, but also with the fixed reference coordinate system linked. In this way, the centerline of the spindle rotation moment spatial position relative to the ideal position of the center line of the spatial deviation is the instantaneous rotational spindle error motion. These moments error trajectory is rotating spindle error motion trajectory. Spindle error motion range of the so-called "spindle rotation accuracy." Thus, the spindle rotation accuracy, indicating spatial position rotary spindle centerline stability characteristics