ISO 17076-1:2020 pdf free.Leather- Determination of abrasion resistance -TaberR method.
7 Procedure
7.1 Preparation of abrasive wheels
7.1.1 Prepare rubber-based abrasive wheels (“CS” series) using the procedure in 7.1.2 to 7.1.8. Prepare tungsten carbide (“S” series) abrasive wheels using the procedure in 7.1.9. Prepare silicon carbide wheels (“H” series) using the procedure in 7.1.10 to 7.1.12.
7.1.2 Fit the rubber-based abrasive wheels to the pivoted arms (5), ensuring that the wheels are mounted on the correct arm with the labels facing towards the centre of the test piece holder.
7.1.3 Fit the additional weights (5.1) to give a loading of (9,8 ± 0,4) N on each abrasive wheel.
7.1.4 Fit a piece of abrasive paper (5.10) to the test piece holder.
7.1.5 Lower the abrasive wheels onto the surface of the abrasive paper, turn on the vacuum (5.9), switch on the machine and run for 20 cycles.
7.1.6 Replace the abrasive paper with a new piece of abrasive paper and repeat 7.1.5.
7.1.7 Examine the abrasive wheels. If the colour is not uniform, repeat the abrasive preparation with a fresh piece of abrasive paper. If the colour is still not uniform, discard the wheels.
7.1.8 Brush the wheels with a soft brush or use compressed air (5.11) to remove any debris.
Optionally, the preparation of rubber-based abrasive wheels can be performed by using the procedure in 7.1.11 to 7.1.12.
7.1.9 Prepare tungsten carbide wheels by brushing with a stiff bristle brush (5.12) to remove any loose particles.
7.1.10 Prepare silicon carbide abrasive wheels by using a diamond re-facing tool (5.15).
7.1.11 Traverse the tip of the diamond re-facing tool across the face of each wheel so that a double traverse (i.e. one forward and one backward movement) takes 25 s. Apply the minimum force necessary to the wheel by the diamond re-facing tool to produce an effective preparation.
7.1.12 Brush the wheels with a stiff bristle brush (5.12) or use compressed air (5.11) to remove any loose particles.
7.2 Abrasion of test pieces
7.2.1 Fit the prepared abrasive wheels (71) or reconditioned abrasive wheels (7) to the pivoted arms (5), ensuring that the wheels are mounted on the correct arm with the labels facing towards the centre of the test piece holder.
7.2.2 Select the weights (5J) to give a loading of either (2,5 ± 0,1) N (no additional weight), (4,9 ± 0,2) N or (9,8 ± 0,4) N on each abrasive wheel. The weight used is recorded in the test report [7 c)J. NOTE Generally, an additional weight of (4,9 ± 0,2) N is used, but the client will specify the weight to be used.
7.2.3 Fit a prepared and mounted test piece (2) to the test piece holder.
7.2.4 Lower the abrasive wheels onto the test piece, turn on the vacuum (5.2) switch on the machine and run for the specified number of cycles.
7.2.5 Stop the machine and remove the test piece. Examine the test piece visually and by using the magnifier (514), and record any damage excluding any damage 2 mm from the edge of the tested area or in depressed areas caused by starting or stopping the machine. If required, use the grey scale (5.13) to determine the colour change of the tested area.
7.2.6 Replace the test piece and continue the abrasion to the next specified number of cycles. Repeat 7.2.5.
7.2.7 Repeat 7.2.6 for any other number of cycles given in 7.2.4.
7.3 Reconditioning of abrasive wheels
7.3.1 Recondition rubber-based abrasive wheels (“CS” series) using the procedure in 7.3.2 to 7.3.5. Recondition tungsten carbide abrasive wheels (“S” series) using the procedure in 7.3.6. Recondition silicon carbide wheels (“H” series) using the procedure in 7.3.7 to 7.3.9.
7.3.2 Prior to each test recondition rubber-based abrasive wheels. Tungsten and silicon wheels should be reconditioned as deemed necessary.
7.3.3 Repeat 7.1.3 to 7.1.5.
7.3.4 Brush the wheels with a soft brush (5.11) to remove any debris.
7.3.5 Use abrasive paper (5.10) for a maximum of 60 cycles (i.e. use for reconditioning three wheels and then replace).
NOTE Optionally, the reconditioning of rubber-based abrasive wheels can be performed by using the procedure in 7.3.8 to 7.3.9.
7.3.6 Recondition the tungsten carbide wheels by brushing with a stiff bristle brush (5.12) to remove any loose particles.
7.3.7 Recondition silicon carbide abrasive wheels by using a diamond re-facing tool (5.15).
7.3.8 Traverse the tip of the diamond re-facing tool across the face of each wheel so that a double traverse (i.e. one forward and one backward movement) takes 25 s. Apply the minimum force necessary to the wheel by the diamond re-facing tool to produce an effective reconditioning.
7.3.9 Brush the wheels with a stiff bristle brush (5.12) or use compressed air (5.11) to remove any loose particles.ISO 17076-1 pdf download.