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Technical Information
Ca
––––
Fm
3
L = x 106
L = life expectancy expressed in number of revolutions
Ca = dynamic load rating (N) [for acme nuts, see design load
column on catalog pages].
Fm = average axial load (N).
Example: For 10 mm pitch screw, 16 mm dia., Ca = 4200 N
carrying an average axial load, Fm = 200 N (45 lbs.) the
expected life is:
L =
x 106 = 9.261 x 109 revolutions.
At an average of 1000 rpm this will result in:
x
= 154 000 hours
of expected operational life. Note that the nature of
the motion (jerky, smooth, etc.) will affect the life
expectancy.
16 mm LIFE EXPECTANCY
Ball & Acme Screw Assembly
Life Expectancy
AXIAL LOAD (N)
25 mm LIFE EXPECTANCY
AXIAL LOAD (N)
Dynamic (Ca)
Static
Axial Load (N)
Screw
Dia.
Pitch
SPECIFICATIONS
2.5
16
3500
5500
4
16
2600
4200
5
6
4600
7200
5
25
5100
12600
10
16
4200
6500
10
25
5100
12600
20
16
1900
2500
20
25
3570
8800
4200
––––
200
3
9.261 x 109 revolutions
––––––––––––––––––
1000 rpm
1 hour
––––––––––
60 minutes
