RA Rodriguez(UK) Ltd are able to offer their customers a very comprehensive bearing design and application support service. Computer analysis of bearing applications include load and life analysis, torque and stiffness analysis, effects of temperature and fits analysis. Some typical examples are shown below:-
  Temperature and Fits Analysis

KA 1000 Brok (zero to 0.0005 ins preload)
 Comments: Effects on preload due to temperature line / loose fits

Coeff. of expansion ---shaft: 0.000013 Housing:0.000013 /inch/deg F
 Fit Transference ------shaft: 48 % Housing: 66 %
 Bearing Initial Internal Fit: 0 to -0.0005 ins ( 0 to -0.013 mm)
Temp Range -40 F (-40 C) +68 F ( =20.0 C ) 158 F (70 C)
ins (mm) ins (mm) ins (mm)

Brg I/D +
            -
Sft O/D +
            -
Sft Fit

9.9924   ( 253.807 )
9.991     ( 253.771 )
9.9846   ( 253.609 )
9.9832   ( 253.573 )
0.0064   ( 0.163 )
0.0092   ( 0.234 )

 10          ( 254 )
9.986     ( 253.964 )
9.9986    ( 253.964 )
9.9972    ( 253.929 )
0            ( 0 )
0.0028    ( 0.071 )		 10.0063    ( 254.16 )
10.0049    ( 254.124 )
10.013     ( 254.262 )
10.0089    ( 254.226 )
-0.0054     ( -0.137 )
-0.0026     ( -0.066 )
Brg O/D +
              -
Hsg O/D +
              -
Hsg Fit		 10.4921    ( 266.499 )
10.4907    ( 266.464 )
10.4867    ( 266.362 )
10.4853    ( 226.327 )
-0.0068     ( -0.173 )
-0.004       ( -0.102 )		 10.5         ( 266.7 )
10.4986    ( 266.664 )
10.5014    ( 266.736 )
10.5         ( 226.7 )
0             ( 0 )
0.0028     ( 0.071 )		 10.5066    ( 266.868 )
10.5052    ( 266.832 )
10.5137    ( 266.048 )
10.5123    ( 226.012 )
0.0057      ( 0.145 )
0.0085      ( 0.216 )

Internal
Brg Fit

 -0.005         ( -0.127 )
-0.0026       ( -0.006 )		 -0.0005     ( -0.013 )
0              ( 0 )		 -0.0031     ( -0.079 )
-0.0012     ( -0.03 )

Fits to Avoid Interference --Sft
at Temperature Extreams --Hsg
9.9932      ( 253.827 )
10.5068     ( 266.873 )		 / 9.9918      ( 253.792 )
/ 10.5082     ( 266.908 )
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  Preload Torque and Stiffness Analysis

KA 100 BROK ( Zero to 0.0005 ins Preload )
Comments: Free Race Fit Stiffness Calculation

Fit Conditions

Preload Contact angle
Initial Contact angle
Bearing APL
Bearing Pitch

Bearing NBL
Equivilent Axial Load

: Shaft = LOOSE

: 31.226 Degrees
: 30 Degrees
: 0.0005 ins
: 0.25 ins

: 0.35 lbs
: 29.77 lbs

: Housing = LOOSE



(0.0127 mm )
( 6.35 mm )

( 1.56 N )
( 132.4 N )

 
 

- Relief Load
- Relief Defl
- Stiffness
- Relief Load
- Relief Defl
- Stiffness
- Relief Load
- Relief Defl
- Stiffness

: 69.19 lbs
: 0.000025 ins
: 2.2823 E+06 lb/in
: 65.52 lbs
: 0.00025 ins
: 0.262 E+06 lb/in
: 349.3 in-lb
: 0.000049 Radians
: 7.161 E+06 in- lb/Rad
Radial


Thrust


Moment

( 307.8 N )
( 0.000623 mm )
( 494.301 E+03 N/mm )
( 291.5 N )
( 0.00635 mm )
( 45.896 E+03 N/mm )
( 39.5 Nm )
( 0.809 E+06 Nm/Rad )

 
Est Running Torque : 0.5885952 ins lbs ( 6.650793E-02 Nm )
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  Race Growth/Preload Poundage/Contact Angle

KA 100 BROK ( Zero to 0.0005 ins Preload

Comments: To demonstrate Race growth & angle change due to preload
Fit Conditions Shaft = TIGHT Housing = TIGHT

Bearing Axial Preload
Equivalent Axial Load
Initial Contact Angle
Resulting Contact Angle
Inner Race Contraction
Outer Race Expansion

: 0.00154 ins
: 196.59 lbs
: 27.378 Degrees
: 31.071 Degrees
: 0.00038 ins
: 0.00032 ins

( 0.0391 mm )
( 874.46 N )
( 0.0096 mm )
( 0.0081 mm )
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  Free Body Analysis

KA 100 BROK (Zero to 0.0005 ins Preload

Comments: Static at 30G and Dynamic loads at 1G simultaneous
Fit Conditions: Shaft = LOOSE Housing = LOOSE

Contact Angle :
Bearing Pitch :
Bearing Speed :

 30 Degrees
0.25 ins ( 6.35 mm )
10 RPM
Static Dynamic
Radial Load :
Thrust Load :
Moment Load :

90 Lbs ( 400.3 N )
300 Lbs ( 1334.5 N )
2250 in Lb ( 254.2 Nm)

 3 Lbs ( 13.3 N )
10 Lbs ( 44.5 N )
75 in Lb ( 8.5 Nm

Reaction R1 :
Reaction R2 :
Reaction R3 :
Reaction R4 :

369.2679 Lbs ( 1642.6 N )
0 Lbs ( 0 N )
721.2295 Lbs ( 3208.2 N )
248.0385 Lbs ( 1103.3 N )

 12.30893 Lbs ( 54.8 N )
0 Lbs ( 0 N )
24.04098 Lbs ( 106.9 N )
8.26795 Lbs ( 36.8 N )

Max Reaction :

( So ) Factor :

Required APL :

721.2295 Lbs ( 3208.2 N )

5.741246

0.0058 ins ( 0.14739 mm )

24.04098 Lbs ( 106.9 N )

172.2374

0.00022 ins ( 0.00555 mm )

Bearing Life
Bearing Life
Estimated Running Torque

:
:
:

1.301904E+08 Hours
7.811267E+10 Revolutions
0.4573331 ins Lbs ( 5.167606E-02 Nm )

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Tel: 01462-670044 Fax: 01462-670880 EMail: info@raruk.com