Automatic testing and sorting machines and special devices for the bearing industry

Ball Scanner Type BASC

is a testing and sorting machine for the non-destructive examination of the surface-quality of bearing balls. It uses an optical method, eddy-current and vibration method. Balls are fed from side to the left and the right monitoring point.

The Ball Scanner is the automatic machine built by KROB for the defectometric examination of the surface-quality of bearing balls. The functionality and the comfort of operation has improved by employing a modern digital technology in comparison to the preceding machines.

The automatic testing and sorting machines type BASC are intended for the defectometric inspection of defects on the surface of steel balls of diameter within the rated extent from 3 - 6 mm, 6 - 10 mm, 10 - 14 mm, 14 - 18 mm, 18 - 25 mm.

Defective balls are sorted out by a newly designed and fully digitalized technology. The three simultaneously used testing methods - optical EOT, eddy-current ECT and vibration sensor EVT - enable a simultaneous examination for point and polish defects (the optical method) and for cracks, flats or shape defects (the eddy-current method and EVT). The check for point defects is evaluated in comparison to either relative or absolute standards.

The ECT and EOT and EVT methods are used in all BASC machines.

If a ball that has passed through the monitoring point is found to be defective, the machine differentiates between the defects that were detected by the optical testers EOT1 and EOT2 (i.e. the ball can be repairable) and the defects found by EVT method and by eddy-current testers ECT (the differential probe with two possible phase selections - this ball is non-repairable).

The eddy-current methods ECT1 and ECT2 have two independent optimally adjustable phase selections and amplification which guarantee a simultaneous examination with the maximum sensitivity for both cracks and flats on a surface of a ball. Both methods have now been complemented by the new Noise Methods - ECT1n und ECT2n. These methods enable not only a sorting of the balls according to defects of type ECT1 and ECT2 but also according to the quality of the whole surface.

The EVT Method enables not only a sorting out of balls with shape defects but also the assessing of vibrations in the monitoring point permits a constant overview of the condition of the mechanical system (bearings, spherocone roller...) as a poorer or rougher rotation of the ball in the monitoring point leads to greater vibration and so to an increased signal which is then assessed by the EVT Method.

The automatic machine type BASC has two separate control systems that allow an independent functioning of the right side and the left side of the machine. The machine sorts the balls after testing in three categories:

  • good (OK)
  • repairable (optical defects) – these balls can be washed and tested again, because dirt is very often the reason for the optical errors. Note: This problem is eliminated by means of the so-called WET INSPECTION. The dust particles are washed off from the ball’s surface during the wet inspection – therefore it does not happen that the dust particles on the ball’s surface get mistaken for defects.
  • non-repairable – defects found by the eddy-current method or by the vibration sensor

Two separate control systems allow an independent functioning of the right and the left side of the machine and an independent termination on both of the sides of the machine after the pre-selected amount of OK balls has been sorted. All three outlets (OK, EOT, ECT/EVT) on both sides of the machine have ball counters. Of course, balls with different diameters can be checked simultaneously on the right and the left side of the machine.

This automatic testing and sorting machine has two separate monitoring points that are integrated into one common system. On the request the BASC machine can be adapted to the customer’s individual requirements. The automatic machine is installed on the table delivered by the manufacturer.

Since the year 2009 we have been supplying our Balls Scanners of Type BASC only in the AS design. The machines supplied with this design can be used both in the STD (STanDard) and the AS (AeroSpace) regimes. The customer just needs to apply the correct type of spherocone roller for the chosen regime. For a more detailed explanation – see MODIFICATIONS AS

For checking the ball surface quality of clean and dry steel balls by the most exacting users KROB delivers Ball Scanners with modification WD (Width Different - only available on special request to the manufacturer). For details see MODIFICATIONS.

It is possible to deliver the stands (special accessories), Ball Transporters (BT, BTG), etc. – in accordance with individual requirements of the respective customer.

The Ball Scanners are the basic component of checking places configurations – see CONFIGURATIONS.

KROB SCANNERS s.r.o., Drahkov 52, 415 01 Teplice, Czech Republic, EUROPE >>> | Version 2006 |
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