HFRR test procedure - Revision history

Alchemyst: /* Measuring the wear scar */

2010-02-23T10:02:42Z

‎Measuring the wear scar

137.215.116.154: /* Measuring the wear scar */

2010-02-22T09:43:22Z

‎Measuring the wear scar

Gerhard Marais: /* Measuring the wear scar */

2010-02-22T08:22:22Z

‎Measuring the wear scar

137.215.6.53: /* Measuring the wear scar */

2010-02-22T08:14:06Z

‎Measuring the wear scar

137.215.116.154: /* Test Procedure */

2010-02-22T07:45:03Z

‎Test Procedure

137.215.116.154: /* Preparation of Apparatus */

2010-02-22T07:29:05Z

‎Preparation of Apparatus

137.215.6.53: /* Taking a photo of the wear scar */

2010-02-18T14:21:38Z

‎Taking a photo of the wear scar

137.215.6.53: /* High Frequency Reciprocating Rig */

2010-02-18T14:21:00Z

‎High Frequency Reciprocating Rig

137.215.6.53: /* High Frequency Reciprocating Rig */

2010-02-18T14:13:29Z

‎High Frequency Reciprocating Rig

137.215.6.53 at 13:42, 18 February 2010

2010-02-18T13:42:14Z

@@ Line 60: / Line 60: @@
 # The following formula is used to calculate the MWSD (measured wear scar diameter):
-<math> MWSD(mm)=\frac{Microscope Eyepiece Measurement}{IC Magnification * 10} </math>
+<math> MWSD(mm)=\frac{\mathrm{Microscope~Eyepiece~Measurement}}{\mathrm{IC~Magnification} \times 10} </math>
 # Insert these values into the HFRR program.

@@ Line 63: / Line 63: @@
 # Insert these values into the HFRR program.
 # Under the comments section give the wear scar a complementary rating according to Olah et al. e.g. "Complementary Rating = 5". The complementary rating method by Olah et al. can be found [ftp://anonymous@ragnarok.up.ac.za/publicftp/lab/Tribology/HFRR/02%20-%20Olah%28Complimentary%20Rating%20HFRR%29.pdf here]
 # Also tell the program to calculate the WS1.4. This is the wear scar corrected to a water vapour pressure of 1.4kPa (this is to bring the effect of humidity into account).

@@ Line 63: / Line 63: @@
 # Insert these values into the HFRR program.
-# Under the comments section give the wear scar a complementary rating according to Olah et al. e.g. "Complementary Rating = 5".
+# Under the comments section give the wear scar a complementary rating according to Olah et al. e.g. "Complementary Rating = 5". The complementary rating method by Olah et al. can be found [ftp://anonymous@ragnarok.up.ac.za/publicftp/lab/Tribology/HFRR/02%20-%20Olah%28Complimentary%20Rating%20HFRR%29.pdf here]
 # Also tell the program to calculate the WS1.4. This is the wear scar corrected to a water vapour pressure of 1.4kPa (this is to bring the effect of humidity into account).

@@ Line 59: / Line 59: @@
 # Use the ruler in the right eye lens to measure the horizontal wear scar diameter (x) and the vertical wear scar diameter (y).
 # The following formula is used to calculate the MWSD (measured wear scar diameter):
 # Insert these values into the HFRR program.
 # Under the comments section give the wear scar a complementary rating according to Olah et al. e.g. "Complementary Rating = 5".

@@ Line 38: / Line 38: @@
 # Fasten upper specimen to oscillating arm with the remaining one small bolt. Be sure that the holder is horizontal before fully securing the unit.
 # BE CAREFUL NOT TO OVER-TIGHTEN THE SCREWS, THEY ARE STRIPPED EASILY.
-# Put 2ml of diesel sample in the lower specimen reservoir using the pipette (flush the pipette with acetone twice and dry it before contact with diesel).
+# Put 2ml of diesel sample in the lower specimen reservoir using the pipette (flush the pipette with acetone twice and dry it before contact with diesel). BE SURE TO SHAKE THE SAMPLE BEFORE USING IT FOR TESTING.
 # Attach the sling and the 200g weight to the extended arms of the upper specimen.  Ensure that the suspension string hangs freely.
 # Put silver thermometer in hole next to the nipple (not in the sample itself, but in the lower block).

@@ Line 26: / Line 26: @@
 # Now place everything in the acetone ultrasonic bath and switch it on for another 10 minutes.
 # When you transfer the specimens NEVER PHYSICALLY TOUCH THE BALL OR THE DISK, AS THE OIL ON YOUR FINGERS WILL FORM A BOUNDARY LAYER. Use a clean tweezer (left in toluene) if you need to handle the ball or the disk.
-# Remove the specimens from the ultrasonic acetone bath and blow dry it.
+# Remove the specimens from the ultrasonic acetone bath after 10 minutes and blow dry it.
 === Calibration and Correction ===

← Older revision		Revision as of 14:21, 18 February 2010
Line 82:		Line 82:

	PLACE ALL THE SPECIMENS AND EQUIPMENT IN THE TOLUENE BATH.		PLACE ALL THE SPECIMENS AND EQUIPMENT IN THE TOLUENE BATH.
−
−	~~# Place the bottom specimen in a toluene ultrasonic bath for 30s and then in toluene.~~

@@ Line 48: / Line 48: @@
 # Click on 'Start'.
 # The test will only start when the temperature has stabilized at 60degC.
 # After the test have finished (75min), remove the top specimen from the configuration.
 #  Without removing the ball from the test ball holder, rinse the holder several times using toluene and then several times using acetone.
@@ Line 60: / Line 59: @@
 # Use the ruler in the right eye lens to measure the horizontal wear scar diameter (x) and the vertical wear scar diameter (y).
 # The following formula is used to calculate the MWSD (measured wear scar diameter):
 # Insert these values into the HFRR program.
 # Under the comments section give the wear scar a complementary rating according to Olah et al. e.g. "Complementary Rating = 5".
@@ Line 74: / Line 72: @@
 ===Taking a photo of the wear scar===
+# Connect the camera to the top of the microscope. Let someone show you how to do this.
-−
 # Focus the microscope on the wear scar on the ball and take a picture with the digital camera.
 # If the microscope is switched on but the light does not seem to come through, lower the the voltage on the voltage control box of the microscope.
-click on 'Export test' and save the data in a suitable location on the computer.
+# Take between three and five photos of the wear scar.
+# Select the best photo on the computer and delete the rest of them to save space on the data card.
 # Place the bottom specimen in a toluene ultrasonic bath for 30s and then in toluene.

@@ Line 20: / Line 20: @@
 === Preparation of Apparatus ===
-# Place the plates and balls into a clean glass beaker containing toluene.
+# After the completion of a test ALWAYS leave the balls, plates and utensils in the toluene bath.
-# Leave them to soak for 8hrs and then put them in the ultrasonic cleaning bath for 10min, together with the sample holders, screws and all the hardware and utensils that come into contact with the test fluid.
+# Check under microscope that upper ball specimen is turned so that the next test will be done on a surface with no wear/scratch marks.
-# Transfer the hardware and the test specimens into an ultrasonic bath containing acetone using CLEAN tweezer.
+# Switch on the toluene ultrasonic bath and set the timer to 10 minutes.
-# Leave the hardware and specimens in the ultrasonic bath for 10min.
+# Place the top specimen, lower specimen, screws and all the hardware and utensils in the ultrasonic toluene bath, and leave for 10 minutes.
-# Remove it and blow dry it.
+# Now place everything in the acetone ultrasonic bath and switch it on for another 10 minutes.
 === Calibration and Correction ===
@@ Line 32: / Line 34: @@
 # Only use already filtered diesel samples to test on the HFRR.
 # Greatest care should be taken to adhere strictly to cleanliness requirements. Always use clean tweezers when handling the specimens and the hardware and be sure not to scratch them.
 # Turn lower disc specimen to get a clean surface for new test using a tweezer.
 # Fasten lower specimen to HFRR machine, with the nipple on the right hand side, with the two small bolts.
 # Fasten upper specimen to oscillating arm with the remaining one small bolt. Be sure that the holder is horizontal before fully securing the unit.
-# Put 2ml of diesel sample in the lower specimen reservoir using a disposable pipette.
+# BE CAREFUL NOT TO OVER-TIGHTEN THE SCREWS, THEY ARE STRIPPED EASILY.
 # Attach the sling and the 200g weight to the extended arms of the upper specimen.  Ensure that the suspension string hangs freely.
-# Put silver thermometer in hole next to the nipple.
+# Put silver thermometer in hole next to the nipple (not in the sample itself, but in the lower block).
 # Open the HFRR program on the computer.
 # Click on 'New Test'.
 # Name the file in which the program will save the data from the test.
 # Click on 'Start'.
-# After the test have finished, click on 'Export test' and save the data in a suitable location on the computer.
+# The test will only start when the temperature has stabilized at 60degC.
 # Without removing the ball from the test ball holder, rinse the holder several times using toluene and then several times using acetone.
-# Ultrasonically clean the top specimen for 30s.
+# After the test have finished (75min), remove the top specimen from the configuration.
 # Ultrasonically clean the top specimen for 30s using acetone.
 # Allow the top specimen to air dry.
-# Attach the digital camera to the top of the microscope
-# Place the upper ball specimen under the microscope under the yellow IC10 magnification.
+===Measuring the wear scar===
 # Focus the microscope on the wear scar on the ball and take a picture with the digital camera.
 # If the microscope is switched on but the light does not seem to come through, lower the the voltage on the voltage control box of the microscope.
-# Place the bottom specimen in a toluene ultrasonic bath for 30s and then in toluene.
+click on 'Export test' and save the data in a suitable location on the computer.
-=== Measuring the Wear Scar ===
+# Place the bottom specimen in a toluene ultrasonic bath for 30s and then in toluene.
-# After taking the photo of the wear scar take the .jpg file and open it in Paint.
-# Open the ruler file (also in Paint) and measure the wear scar.
-# See Section 9,10 of ISO12156.

← Older revision		Revision as of 13:42, 18 February 2010
Line 1:		Line 1:
−	==~~Filtering~~==	+	==Filtration==

	# Beforehand, all equipment that will come in contact with the diesel sample must be rinsed thoroughly with heptane and then air dried		# Beforehand, all equipment that will come in contact with the diesel sample must be rinsed thoroughly with heptane and then air dried