ASTM D3233 for Measurement of Extreme Pressure Properties of Fluid Lubricants
ASTM D3233 Standard Test Methods for Measurement of Extreme Pressure Properties of Fluid Lubricants (Falex Pin and Vee Block Methods)
TEST METHOD A
11. Determination of Actual Gage Load for Run-In
11.1 The procedure, Section 12, requires a run-in at an actual gage load equivalent to 300-lbf (1334-N) true load (264-lbf direct load). This actual gage load is obtained as follows from the plot of actual gage load and true load prepared in Sections 9 and 10: Locate 300 lbf (1334 N) on the true load curve (264-lbf direct load). Through this point draw a vertical line to intersect the actual gage load curve. Through this point of intersection draw a horizontal line to the left-hand or right-hand load scale and read the actual gage load value. Record this actual gage load for run-in on a suitable reporting form.
NOTE 7 - A suitable reporting form for Test Methods A and B, and data obtained on one of the reference fluids by one of the cooperating laboratories, is shown in Table 3. Fig. 6 shows the calibration curves used by the laboratory reporting the data in Table 3.
12. Procedure
12.1 Run-In:
12.1.1 Turn on "Heat Control" switch and heat test lubricant to 120 ± 5°F (51.7 ± 3°C); then turn off the switch.
12.1.2 Remove slack from assembly by moving the ratchet wheel by hand. At this setting the torque gage should read zero, or be adjusted to zero.
12.1.3 Actuate the motor, engage the automatic loading ratchet, and increase the load to a gage load equivalent to 300-lbf (1334-N) true load (264-lbf direct load), as determined in 8.1. Disengage the loading ratchet, start the timer, and allow the machine to run at this loading for a 5-min run-in period.
NOTE 8 - Maintain load at near constant by taking up the load manually or automatically by means of the ratchet wheel if necessary.
12.2 Test:
12.2.1 Re-engage the automatic loading ratchet and leave it engaged until failure (Note 9) or until the highest indicated actual gage reading is reached. Stop the motor at failure or at the highest indicated actual gage load when no failure is obtained. Record the gage load at failure. Record 4500 lbf (20 000 N) if no failure is obtained.
NOTE 9 - Failure is indicated by (a) breakage of shear pin or test pin, or (b) inability to take up the load automatically by means of the ratchet wheel.
12.2.2 Using the calibration curves prepared in Sections 9 and 10, determine and record the true load failure equivalent to the actual gage load failure, or, if no failure, the true load equivalent to the highest indicated actual gage load, with a plus (+) sign after the true load value.
NOTE 10 - To convert actual gage load to true load, locate the gage load on the actual gage load curve. Through this point draw a vertical line to intersect the true load curve. Through this point of intersection draw a horizontal line to the left-hand or right-hand load scale and read the true load value.
