Abrasive discs are used by dental technicians to sculpt and polish dentures. The discs are spun on the technician’s motorised hand piece at speeds of up to 20000 rpm. The abrasive surface applies sculpting and polishing friction, so high torque loads are normal. In order to reduce the possibility of the disc’s two parts – centre ring and abrasive disc – separating during use, the manufacturer wanted to test the torque performance of the join between them.
This video introduces the adaptor and shows the test being set up.
The test is designed to test to destruction the join between the centre ring and the abrasive disc. Pressure from the clamp plate ensures the abrasive disc does not spin inside the jig but rotates in unison with the jig.
The jig is rotated to 90 degrees clockwise and then 180 degrees anti-clockwise. If the centre ring and abrasive disk remain aligned (the radial marking will indicate this), the join between them is good and the disc passes the test. If the quality of join between centre ring and disk is insufficient, the centre ring will rotate independently of the disc and the sample will fail.
Post a Comment