412LXR Series Product Manual
Chapter 2 - 412LXR Series Table Specifications
15
Table A – Linear Motion Guide Bearing Life/Load Computation
Positioner
Loads
Compute
Evaluate Life On
Side & tension Ps > Pt
Side & tension Ps
≤
Pt
Pe = (0.5 x Pt) + Ps
Pe = (0.5 x Ps) + Pt
Side load chart
Tension chart
412LXR
Side & compression Ps > Pc
Side & compression Ps
≤
Pc
Pe = (0.5 x Pc) + Ps
Pe = (0.5 x Ps) + Pc
Side load chart
Compression chart
Example Computations
Page 13 shows this
configuration with dimensions
given here.
6
.
67
2
2
4
2
1
=
=
=
d
d
L
P
P
(tension) Kgf
d1 = 205 mm
db = 130 mm
d2 = 192 mm
d3 = 50 mm
da = 43 mm
d4 = da + db = 173
6
.
67
2
2
4
4
3
−
=
−
=
=
d
d
L
P
P
(compression) Kgf
0
.
37
2
4
1
3
3
1
=
⋅
+
=
=
d
d
L
L
P
P
s
s
(side load) Kgf
5
.
0
2
4
1
3
4
2
−
=
⋅
−
=
=
d
d
L
L
P
P
s
s
(side load) Kgf
The normal and side force
components on each bearing
block are computed from the
equations as shown:
Life for each bearing needs to be evaluated
independently. For bearings with a side load,
refer to the combined equivalent loading factors
(Table A).
Example:
Bearing 3 had P
3
= 39.6 Kgf tension and P
3s
= 9.7
Kgf side load
Kgf
Pc
Ps
Pe
Pc
Ps
5
.
44
)
5
.
0
(
=
+
×
=
⇒
≤
Refer to Bearing Life Normal Load (page 13)
Life @ 44.5 Kgf = 30,000 km
Example 1
Horizontal Translation
with Side Loads, 412LXR-
12 Pole Positioner
L = 150 Kgf
130 mm from
carriage surface;
50 mm from carriage
center.
