Linear guideways ( complete program ) - HIWIN - #11

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HIWIN, n
G99TE13-0809 9
Table 1.6 Calculation Example for Service Life
Type of Linear Guideway Dimension of device
Operating condition
Weight (W) : 4 kN Acting force (F) : 1 kN Temperature: normal temperature Load status: normal load
Type: HGH 30 CA C : 38.74 kN C0 : 83.06 kN Preload: ZA
d : 600 mm c : 400 mm h : 200 mm l : 250 mm
l
c/2 c/2
3
Force
w
O Calculation of acting loads
P^-^-^4^- 1x250 =0.458(kN) 2d 2d 2x600 2x600
Pmax= 0.458(kN)
O Pc is equal to the sum of Pmax and preload Pc=Pmax+ PZ =0.458+(38.74 x 0.07)=3.17(kN)
O Calculation for life L
fh x ft x C fw x Pc
1x 1 x 38.74 2 x 3.17
L=(
) x 50=
x50=11,400(km)
1-6 Friction
As mentioned in the preface, a linear guideway allows a type of rolling motion, which is achieved by using balls. The coefficient of friction for a linear guideway can be as little as 1/50th of a traditional slide. Generally, the coefficient of friction of linear guideway is about 0.004.
When a load is 10% or less than the basic static load rate, the most of the resistance comes from the grease viscosity and frictional resistance between balls. In contrast, if the load is more than the basic static load rating, the resistance will mainly come from the load.
F = |j • W+S .......................................................................... Eq.1.8
F: Friction (kN) S: Friction resistance (kN) u: Coefficient of friction W: Normal loads (kN)

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