MTP-1 Ketos Ring – for particle sensitivity testing

MTP-1 Ketos Ring – for particle sensitivity testing

The Tool Steel Rings serve for the sensitivity and performance evaluation of the whole testing system. Each sample is a ring ( Ø127 mm x 22 mm) made of AISI 01 tool steel, hardness 90 to 95 HRB, provided with a central bore with a diameter of 31.75 mm. At the front face bore holes with a diameter of 1.75 mm are drilled at different distances from the ring edge. The Ketos Tool Steel Ring has 12 holes, and the Aerospace Standard Tool Steel Ring has 9.
In order to test the complete MT procedure efficiency, the magnetizing direct currenthas to be passed through the center of the ring via a central conductor (length >406.4 mm, Ø 25.4 – 31.75 mm) to generate the leakage fields above the holes. Thefield strength decreases along with increasing distance to the ring edge. When the magnetic suspension is applied on the ring, magnetic powder accumulates on the ring edge over the holes, forming indication lines. The process corresponding to the recovery of a recommended number of holes is accepted as optimal.