APPLICATION: Parker 492620: Form Setup Date: 03/29/2000 Calculation Date: 10/2/2012

Form Setup Date: 03/29/2000
Calculation Date: 10/2/2012
Thomson Saginaw
Ball Screw Co., LLC.
APPLICATION: Parker 492620
SCREW SHAFT VARIABLES
Ball Diameter:
0.125000
BCD:
1.00000
Lead:
0.200000
P = 3.141592654
3.1415927
Diametral Lash (MIN):
0.0020
.250 ball and up (MIN):
0.003
Root Factor:
0.007
CALCULATED DIMENSIONS
Helix Angle ():
88.00
Land Diameter:
0.9750
Tol. +.005/-.000 thru .171 BD

& for all aircraft
Tol. +.010/-.000 above .171 BD
Approximate Root Diameter (REF):
0.8646
Diameter Over Balls (tight):
1.1250
Diameter Over Balls (exact MAX):
1.1240
Diameter Over Balls (exact MIN):
1.1220
Master Setting Dimension

On Helix:
0.877998
Form Setup Date: 03/29/2000

Calculation Date: 10/2/2012
Thomson Saginaw
Ball Screw Co., LLC
APPLICATION: Parker 492620
BALL NUT VARIABLES
Ball Diameter:
0.125000
BCD:
1.00000
Lead:
0.200000
P = 3.1416
3.1415927
Diametral Lash (MIN):
0.0020
.250 ball and up (MIN):
0.003
Root Factor:
0.007
CALCULATED DIMENSIONS
Helix Angle ():
88.00
Land Diameter:
1.0250
Tol. +.000/-.005 thru .171 BD

Tol. +.000/-.010 above .171 BD
Approx. Root Diameter (REF):
1.1354
Diameter Between Balls (tight):
0.8750
Diameter Btw. Balls (exact MIN):
0.8760
Diameter Btw. Balls (exact MAX):
0.8780
Master Setting Dimension

On Helix:
1.131978
Thomson Saginaw
Ball Screw Co., LLC
Thin Dense Chromium

Plating Analysis
BALL CENTER TRAVEL ANALYSIS
Assembly
5702224
Variables
Ball Diameter: 0.187500
P = 3.141592654
BCD: 1.375000
C:
5.0
Lead: 0.338000
S:
21.63
31.252
3.1415927
Calculations
X: 0.375000
R:
0.6875
Ball Impact Analysis and Life Cycles of Screw

RO:
0.6212
AO:
28.239
IPR:
12.748
IPS:
63.742
IPC: 127.484
Cycles:
19610
IPR:
10.506
Ball Impact Analysis and Life Cycles of Nut

RI:
0.7538
IPS:
672.330
AI:
34.266
IPC: 1344.661
Cycles:
1859
Hertz Stress
Lubrication
175,000psi = 1610lbf axial load
MIL-L-7870 oil @ 1 drop every

3 minutes
Speed
Efficiency
100-300rpm
90% minimum
ROOT MEAN CUBE LOAD

% of Stroke (.XX)
DOG STOP BEARING STRESS (MMC)
Load (lbf)
Variables
RMC Load:
0.0
Torque (Ultimate-in*lbf):
1280.0
"B"
Bearing Stress (Ultimate-psi): 219000.0

(reference MIL-HDBK-5F)
Axial Gap "B" (in):
0.0810
Stop Height (in):
0.2400
0.000
Chamfer Height (in):
0.0400
EFFICIENCY
Wall Thickness (in):
0.1420
Stop Area Outside Radius (in):
0.9800
Stop Area Inside Radius (in):
0.8380
"C"
Variables
Load (lbf):
0.0
Lead (in):
Torque (in*lbf)
0.00
0.000000
P = 3.141592654
3.14159265
Calculated Efficiency
#DIV/0!
Calculations
Bearing Area (square in):
0.0112
Mean Radius (in):
0.9090
Load (lbf):
1408.1
THEORETICAL ROOT DIAMETER

Variables
Corr. Factor:
BCD (in):
0.875000
0.007
Bearing Stress (psi): 125525.1
Root Dia. (Scr)
0.7396
B/N
1.0104
Margin of Safety: 0.744671
EFFECTIVE DIAMETER
Variables
ADJUST LOAD FOR 200KSI HERTZ STRESS
Ball Diameter:
0.000000
Lead (in):
BCD:
0.0000
Corr. Factor:
0.000000
Variables
-0.0070
B/N
1.6244
hertzr:
200000
100
-0.0070
Calculations (1)
544.369
Adjusted Load (lbf)
601.449
(2)
8.506
CONFORMITY
Variables
Groove Radius (in):
Conformity %
0.0000
Ball Diameter (in):
0.093750
0.00
APPROX. TOTAL VOLUME OF BALL THREAD (UNWOUND)

Variables
ULTIMATE LOAD
Lead (in):
0.1745
BCD (in): 0.875000
0.0
Axial Length of Thread Area (in):
7.855
Land Dia. (in):
0.8525
0.0
Groove Radius (in):
0.0775
Offset (in):
0.0088
Weight Density (lbf/in^3):
0.282
2.754
Variables
Limit Load (lbf):
Ultimate Load (lbf)
Kgf CONVERSION
Variables
Load (Kgf):
1.000
Load (N):
9.807
Load (lbf):
2.205
Calculations
Helix Angle ()
3.632
Length/Turn
Number of Turns
45.014
Thread Length
123.989
Outer Area 1
0.0009
Area 2
0.0006
Groove Area
0.0033
Ball Thread Volume
0.4045
Weight (lbf)
0.114
MINIMUM THREAD ENGAGEMENT FOR STEEL

Variables
Thread Major
Diameter (in):
Max. Minor Dia. Of

0.2500
# of Threads
per Inch:
Internal Thd. (in):
0.2067
Min. Pitch Dia. Of

20
External Thd. (in):
0.2147
from PD382
or chart
# of Balls:
Effective Dia. (Scr)
Stress Factor:
0.007
ADJUST LOAD FOR 175KSI HERTZ STRESS

Calculations
Variables
Tensile Stress
Area (to 100KSI)
Tensile Stress Area

0.0318
(above 100KSI)
0.165
(above 100KSI)
Length
(up to 100KSI)
Actual Hertz Stress/Ball (psi):
229952
Adj. Hertz Stress (psi):
175000
0.0309
Length
0.109
Calculations
Adjusted Operating Load
1610.5
RMC Load (lbf):
3654.0
"A"
RMC LOAD FOR MULTIPLE LOAD CONDITIONS (I.e. 737 flap)

Condition 1 - Takeoff Cycle (XX% of time)
Asm
5701803
% of Stroke (.XX) Load (lbf)

0.04
2115.0
0.19
1265.0
0.62
115.0
% of time
0.50
Factor 1
381995928
% of time
0.40
Factor 2
1544388403
% of time
0.00
Factor 3
% of time
0.10
Factor 4
3302152602
0.850
"C"
Condition 2 - Landing Cycle (XX% of time)

0.62
150.0
0.19
1627.0
0.19
2520.0
1.000
Condition 3 - Takeoff Cycle (XX% of time)
0.000
Condition 4 - Landing Cycle (XX% of time)
0.62
150.0
0.19
1627.0
0.19
5534.0
from PD382
1.000
Sum of Factors
5228536933
RMC Load
1735.6
4
5
0.1503
4.3952
Solid Shaft
Diameter
2.000
Density
0.277
Volume
188.5
Weight
52.2
Shim Washer
OD
0.365
Density
0.282
Volume
0.000047
Weight
0.000013
Length
60.0
ID
0.270 Thickness
0.0010

APPLICATION: Parker 492620: Form Setup Date: 03/29/2000 Calculation Date: 10/2/2012

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APPLICATION: Parker 492620: Form Setup Date: 03/29/2000 Calculation Date: 10/2/2012

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Form Setup Date: 03/29/2000

Calculation Date: 10/2/2012

Diametral Lash (MIN):

.250 ball and up (MIN):

Tol. +.005/-.000 thru .171 BD

Approximate Root Diameter (REF):

Diameter Over Balls (tight):

Diameter Over Balls (exact MAX):

Diameter Over Balls (exact MIN):

Master Setting Dimension

Form Setup Date: 03/29/2000

Diametral Lash (MIN):

.250 ball and up (MIN):

Tol. +.000/-.005 thru .171 BD

Approx. Root Diameter (REF):

Diameter Between Balls (tight):

Diameter Btw. Balls (exact MIN):

Diameter Btw. Balls (exact MAX):

Master Setting Dimension

Thin Dense Chromium

BALL CENTER TRAVEL ANALYSIS

Ball Impact Analysis and Life Cycles of Screw

Ball Impact Analysis and Life Cycles of Nut

175,000psi = 1610lbf axial load

MIL-L-7870 oil @ 1 drop every

ROOT MEAN CUBE LOAD

DOG STOP BEARING STRESS (MMC)

Bearing Stress (Ultimate-psi): 219000.0

Stop Height (in):

Chamfer Height (in):

Wall Thickness (in):

Stop Area Outside Radius (in):

Stop Area Inside Radius (in):

Mean Radius (in):

THEORETICAL ROOT DIAMETER

Root Dia. (Scr)

ADJUST LOAD FOR 200KSI HERTZ STRESS

Adjusted Load (lbf)

Ball Diameter (in):

APPROX. TOTAL VOLUME OF BALL THREAD (UNWOUND)

BCD (in): 0.875000

Axial Length of Thread Area (in):

Land Dia. (in):

Groove Radius (in):

Weight Density (lbf/in^3):

Ball Thread Volume

MINIMUM THREAD ENGAGEMENT FOR STEEL

Max. Minor Dia. Of

Internal Thd. (in):

Min. Pitch Dia. Of

External Thd. (in):

ADJUST LOAD FOR 175KSI HERTZ STRESS

Tensile Stress Area

Actual Hertz Stress/Ball (psi):

Adj. Hertz Stress (psi):

RMC Load (lbf):

RMC LOAD FOR MULTIPLE LOAD CONDITIONS (I.e. 737 flap)

% of Stroke (.XX) Load (lbf)

Condition 2 - Landing Cycle (XX% of time)