ASTM D2670 method for measuring wear properties of fluid lubricants
ASTM D2670 standard test method for measuring wear properties of fluid lubricants (Falex pin and Vee block method)
13. Procedure
13.1 Insert the test journal in the test shaft and secure with a new brass locking pin, as shown in Figs. 1-3.
13.2 Insert the V-blocks into the recesses of the loading device and swing the V-blocks inward to contact the journal so that the V-grooves are aligned with the journal major axis, as shown in Fig. 1 and Fig. 2.
13.3 Place 60 mL of test lubricant in the lubricant cup and raise the cup so that the V-blocks are immersed in the test lubricant.
13.4 Place the automatic loading device with attached gage, on the jaw arms.
13.5 Remove slack from assembly by moving the ratchet wheel by hand. At this setting the torque gage should read zero, or be adjusted to read zero.
13.6 Actuate the motor, engage the automatic loading ratchet and increase the gage load to 250 lb if the 800 or 3000-lb gage is used, or 350 lb if the 4500-lb gage is used. Disengage the loading ratchet, start the timer, and allow the machine to run at this loading for a 5-min break-in period.
13.7 Re-engage the automatic loading ratchet and leave it engaged until the gage load corresponding to 3.30-mm diameter indentation on the standard test coupon (7.1 and 7.2) is reached (Note 6). When this gage load is reached, disengage the loading device, start the time, and record the gear tooth number (Note 7). Run the test for 15 min, maintaining the load at near constant during the test by taking up the load, by means of the ratchet wheel, whenever wear causes a drop in load of 5 lb on the 800-lb gage or 50 lb on the 4500-lb gage. After 15 min running at the test load, reduce the load by 100 lb on the gage and then return to the test load, by means of the ratchet wheel. Scribe the ratchet wheel, determine and record the total teeth wear. Stop the motor.
NOTE 6 - With lubricants having relatively low load-carrying properties, such as non-additive petroleum oils, seizure of the V-blocks and journal will occur at the test load. Discontinue test if seizure occurs. Test conditions should be altered.
NOTE 7 - The gear tooth number is conveniently located by scribing the aluminum ratchet wheel by laying a pencil across the loading arms. The difference between the gear tooth number at the start of the test and the gear tooth number at the end of the test gives the total teeth wear.
