ASTM D3336-05(2010)
(Test Method)Standard Test Method for Life of Lubricating Greases in Ball Bearings at Elevated Temperatures
Standard Test Method for Life of Lubricating Greases in Ball Bearings at Elevated Temperatures
SIGNIFICANCE AND USE
This test method can be used to evaluate the ability of grease to provide adequate lubrication for extended periods of ball bearings operating under light loads at high speeds and elevated temperatures.
SCOPE
1.1 This test method covers the evaluation of the performance of lubricating greases in ball bearings operating under light loads at high speeds and elevated temperatures.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 8.1.
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Standards Content (Sample)
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Designation: D3336 − 05(Reapproved 2010)
Standard Test Method for
Life of Lubricating Greases in Ball Bearings at Elevated
Temperatures
This standard is issued under the fixed designation D3336; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope temperature. Tests are continued until failure or completion of
a specified number of hours of running time.
1.1 This test method covers the evaluation of the perfor-
mance of lubricating greases in ball bearings operating under
4. Significance and Use
light loads at high speeds and elevated temperatures.
4.1 This test method can be used to evaluate the ability of
1.2 The values stated in inch-pound units are to be regarded
grease to provide adequate lubrication for extended periods of
as standard. The values given in parentheses are mathematical
ball bearings operating under light loads at high speeds and
conversions to SI units that are provided for information only
elevated temperatures.
and are not considered standard.
5,6
5. Apparatus
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5.1 Test Spindle (see Figs. 1-4 ), capable of operating at
responsibility of the user of this standard to establish appro-
speeds of 10 000 rpm and temperatures as high as 371°C
priate safety and health practices and determine the applica-
(700°F). The test bearing seat dimension shall be 19.99 to
bility of regulatory limitations prior to use. For specific
20.00 mm (0.7870 to 0.7874 in.). For spindles having the test
warning statements, see 8.1.
bearing and the support bearing in the same housing (CRC
Type, Figs. 1-3)(Note 2) the internal construction of the
2. Referenced Documents
spindle shall be such that the outboard support bearing, or both
bearings are free to float axially in the housing. In designs
2.1 ASTM Standards:
A600 Specification for Tool Steel High Speed where both bearings are free to float, the spindle shaft shall
have a 0.508 to 0.762 mm (0.020 to 0.030 in.) free axial
2.2 ABMA Standard:
movement or end play. The outboard bearing seat dimension
Standard 4, Tolerance Definitions and Gaging Practices for
should be 19.99 to 20.00 mm (0.7870 to 0.7874 in.).
Ball and Roller Bearings
5.1.1 The test unit design (Fig. 1 and Fig. 2) should be such
2.3 ASTM Adjuncts:
4 that a finger spring washer produces a 22 to 67 N (5 to 15 lbf)
Standard Ball Bearings (set of five)
thrust load on the floating outboard support bearing.
3. Summary of Test Method
5.2 Bearing Housing:
5.2.1 For CRC Type Spindles—The bearing housing diam-
3.1 A grease lubricated SAE No. 204 size ball bearing is
eter shall be 47.005 to 47.021 mm (1.8506 to 1.8512 in.) to
rotated at 10 000 rpm under light load at a specified elevated
give proper bearing mounting. Construction shall be such that
the test bearing is equipped with flush spacers or shields to
This test method is under the jurisdiction of ASTM Committee D02 on confine the grease to the bearing. The spacers or shields shall
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.G0.05 on Functional Tests - Temperature.
Current edition approved Oct. 1, 2010. Published November 2010. Originally Complete apparatus is available from Falex Corp., 1020 Airpark Dr., Sugar
ε1
approved in 1975. Last previous edition approved in 2005 as D3336–05 . DOI: Grove, IL 60554.
10.1520/D3336-05R10. If you are aware of alternative suppliers, please provide this information to
For referenced ASTM standards, visit the ASTM website, www.astm.org, or ASTM International Headquarters. Your comments will receive careful consider-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM ation at a meeting of the responsible technical committee, which you may attend.
Standards volume information, refer to the standard’s Document Summary page on Pope Machinery Corporation GreaseTest Spindles No. P-1911 or P-6301A-HT
the ASTM website. (Fig. 1) and No. P-7605-B (Fig. 2); and Falex Corp. spindles of the type shown in
Available fromAmerican Bearing ManufacturersAssoc., 2025 M St., NW, Ste Fig. 1 and Fig. 2 have been found satisfactory for this purpose.
800, Washington, DC 20036. The sole source of supply of the apparatus known to the committee at this time
Available from ASTM International Headquarters. Order Adjunct No. is Falex Part No. 643-187-070, Falex Corp. 1020 Airpark Dr., Sugar Grove, IL
ADJD3336. Original adjunct produced in 1984. 60554.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3336 − 05 (2010)
FIG. 1 Test Spindle (Both Bearings Floating)
FIG. 2 Test Spindle (with Radial Load)
have a clearance between the inside diameter and the shaft of contact with the outer race of the test bearing. The housing
0.127 to 0.178 mm (0.005 to 0.007 in.) per side. shall be fitted with lugs to accommodate a yoke and added
weight so that a radial load may be applied to the test bearing.
NOTE 1—This type of spindle is described in CRC Research Technique
Athrust load of 22 62N(5 6 0.55 lbf) shall be applied to the
for the Determination of Performance Characteristics of Lubricating
Grease in Antifriction Bearings at Elevated Temperature (CRC Designa- outerraceofthebearingbymeansofahelicalspringcalibrated
tions L-35-54 and CRC L-35-62).
at room temperature.
5.2.2 For Navy Type Spindles (Test Bearing Mounted Out-
5.3 Motor Drive Assembly—Spindle bracket and constant
side Spindle Housing)—The bearing housing shall be con-
belt tension motor drive assembly capable of providing spindle
structed of material similar to that of the test bearing and shall
speeds up to 10 000 6 200 rpm by means of an endless belt.
be tempered to retain dimensional stability at temperatures up
The motor shall be mounted so that a belt tension of approxi-
to 371°C (700°F). Internal diameter shall be 47.005 to 47.021
mately 67 N (15 lbf) can be maintained on the test spindle
mm (1.8506 to 1.8512 in.). The housing cover shall be flush
pulley.
fitting to confine the grease to the bearing. Provision shall be
made for insertion in the housing of one or two small 5.4 Oven, removable, capable of producing a test tempera-
thermocouples which shall lightly press on and be in continual ture of 371°C (700°F) within 1 ⁄2 h.
D3336 − 05 (2010)
FIG. 3 Test Spindle Thrust Load Design
FIG. 4 G-III-54 Grease Life, Hours to Failure
5.5 Control Equipment: adequate to maintain the temperature at the outer race of the
5.5.1 The temperature at the outside diameter of the test test bearing within the limits specified by control of the oven
bearing shall be maintained within 3°C (5°F) of the specified temperature. The oven temperature shall be controlled by
test temperature. The temperature control equipment shall be means of a thermocouple placed in the oven cavity.
D3336 − 05 (2010)
5.5.2 Suitable equipment such as adjustable reset relay and makingsurethatthegreasedoesnotextendbeyondthefacetof
overload device for shutting off oven heaters and drive motor the races. For CRC Type spindles the support bearing shall be
and other accessory equipment (timer, recorder, etc.) shall be packed full.
provided. Oven temperature as well as bearing temperature
8.3 Assemblethetestbearing,supportbearing,andZ-spring
should be recorded.
(see Fig. 1 and Fig. 2) on the spindle and fix the thermocouples
into position so that it is in contact with the outer race of the
6. Materials
test bearing (CRC Type spindles). For tests at 232°C (450°F)
6.1 Test Bearing, SAE No. 204 size, fabricated from heat-
and above, replace the finger spring washer for each test. For
resistant steel, suitable for temperatures as high as 371°C Navy Type spindles insert the test bearing into the housing and
(700°F).ThebearingshallbemanufacturedtoABEC-3quality,
pressthebearingontothespindlebyapplicationofalightforce
having a radial clearance of from 0.025 to 0.031 mm (0.0010 on the inner race. Place the cover plate in position, fix the
to 0.0012 in.). See Annex A1 which describes ABMA’s
thermocouples into position, and apply the radial and thrust
standard method of measuring radial internal clearances of ball loads.
bearings. The bearing shall be equipped with a ball retainer
9. Procedure
fabricated from suitable material capable of withstanding
temperatures as high as 371°C (700°F). Support bearings of 9.1 Rotate the bearing by hand for approximately 100
CRC Type spindles shall be identical to the test bearings.
revolutions in each direction at a speed not exceeding 200 rpm.
Start the drive motor and heater simultaneously and adjust the
NOTE 2—Bearings fabricated from 18-4-1 high speed or M-50 (Speci-
temperature controller to raise the bearing to test temperature
fication A600) tool steel with retainers fabricated from heat-treated
within 1 ⁄2 h. After two hours of test operation at speed and
silver-plated beryllium copper have been found satisfactory for this
purpose. Alternatively, for testing at temperatures of 149°C (300°F) and
control temperature, measure the temperature of the outer
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