Brochure

Mtd. Ball
Bearings
G-263
®
Mounted Ball Bearing Engineering Section
Vibration Analysis
BALL BEARINGS VIBRATION ANALYSIS
The following equations are used to calculate the fundamental frequencies for Sealmaster and Browning Ball Bearings.
1. If the insert number is known, proceed to step 2. For housed units, identify the bearing insert number by look-
ing up the unit in the dimension tables, then proceed to step 2.
2. Find the Sealmaster or Browning insert number in Table 16 below and identify the series.
3. Select the vibration geometry information (O, I, B, F) from Table 16.
4. Use this information to calculate the fundamental bearing frequencies:
• Outer Ball Pass Frequency (Hz) = O x RPM
• Inner Ball Pass Frequency (Hz) = I x RPM
• Ball Spin Frequency (Hz) = B x RPM
• Fundamental Train Frequency (Hz) = F x RPM
Symbol Description Units
RPM = Revolutions per Minute RPM
O = Outer Race Frequency Factor
I = Inner Race Frequency Factor
B = Ball Spin Frequency Factor
F = Fundamental Train Frequency Factor
Series
Standard Duty Bore Diameter Medium Duty Bore Diameter
Pitch
Diameter
(inch)
dM
Number
Of Balls
N
Size of
Balls
(inch)
D
Factor
For Outer
Race
O
Factor
For Inner
Race
I
Factor
For Ball
Spin
B
Factor
for F.T.F.
F
inch mm inch mm
*L-10 *1/2 to 5/8 N/A - - 1.138 9 1/4 0.0585 0.0915 0.0361 0.0065
2-012 1/2 to 3/4 20mm - - 1.345 9 9/32 0.0593 0.0907 0.0381 0.0066
2-015 13/16 to 1 25mm - - 1.544 10 9/32 0.0682 0.0985 0.0442 0.0068
2-13 1 1/16 to 1 1/4R or S 30mm 15/16 to 1 25mm 1.812 9 3/8 0.0595 0.0905 0.0385 0.0066
2-17 1 1/4 to 1 7/16 35mm 1 3/16 30mm 2.115 9 7/16 0.0595 0.0905 0.0386 0.0066
2-19 1 1/2 to 1 9/16 40mm 1 7/16 35mm 2.362 9 1/2 0.0591 0.0909 0.0376 0.0066
2-111 1 5/8 to 1 3/4 45mm 1 1/2 40mm 2.596 10 1/2 0.0673 0.0994 0.0417 0.0067
2-115 1 13/16 to 2R 50mm 1 11/16 to 1 3/4 45mm 2.763 10 1/2 0.0683 0.0984 0.0445 0.0068
2-23 2 to 2 3/16 55mm 1 15/16 50mm 3.051 10 9/16 0.0680 0.0987 0.0437 0.0068
2-27 2 1/4 to 2 7/16 60mm 2 3/16 55mm 3.356 10 5/8 0.0678 0.0989 0.0432 0.0068
2-211 2 1/2 to 2 11/16 70mm 2 7/16 to 2 1/2 65mm 3.846 10 11/16 0.0684 0.0982 0.0451 0.0068
2-215 2 7/8 to 2 15/16 75mm 2 11/16 70mm 4.045 11 11/16 0.0761 0.1072 0.0476 0.0069
2-33 3 to 3 3/16 80mm 2 15/16 to 3 75mm 4.362 11 3/4 0.0759 0.1074 0.0470 0.0069
2-37 3 1/4 to 3 7/16 - 3 3/16 80mm 4.627 11 25/32 0.0762 0.1071 0.0479 0.0069
2-38 3 1/2 90mm 3 7/16 - 4.922 10 7/8 0.0685 0.0981 0.0454 0.0069
2-43 3 15/16 to 4 - 3 15/16 to 4 100mm 5.808 10 1 1/16 0.0681 0.0986 0.0440 0.0068
3-47 5 - 4 7/16 to 4 15/16 - 7.087 10 1 1/4 0.0686 0.0980 0.0458 0.0069
For specic bearing insert, refer to load rating page G-227 to G-229 to determine series
*L-10 series only applies to Browning units for the Bore Diameters shown. For VER-208 and 210 units use the 2-012 series values
Table 16 - Vibration Geometry Information