FED-STD-791D
not be considered as being satisfactory. Faulty maintenance practices,
improper test procedures, or the need for major overhaul can be indicated
if the average on the reference oil does not fall within these limits.
6.5 Data Sheets
6.5.1 The suggested data sheets are shown on Figures 8 and 9. These sheets have
areas provided to enter all pertinent information obtained during test and inspection.
7. CALCULATIONS
7.1 Calculate the effective tooth width using following equation:
W 2 = 0.98 W 1
where:
W2 = effective tooth width in cm (in).
W1 = measured gross tooth width in cm (in).
7.2 Calculate the load carrying capacity from the following equation:
KL
P=
W2
where:
P = load-carrying capacity of the lubricant in N/cm (lb/in) of tooth-face width.
K = WADD gear machine constant (11.5 by definition).
L = load-oil pressure Pa gage (psig).
W2 = effective tooth-face width in cm (in).
8. REPORTING
8.1 Report the following items:
a. The individual ratings of the test oil obtained from the "A" and "B" sides of all
gears tested in N/cm (lb/in) of the tooth-face width (6.3.5.1).
b. The average rating of the test oil in N/cm (lb/in) of tooth-face width.
c. The standard reference oil average rating in N/cm (lb/in) of tooth-face width
(6.4.1).
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