MGB EN

MGB | Data sheet

Size

Equivalent factor

KA 1

KA 2

KB 1

KB 2

KC

15

1.66 x 10 -1

2.98 x 10 -2

1.66 x 10 -1

2.98 x 10 -2

1.57 x 10 -1

15L

1.18 x 10 -1

2.33 x 10 -2

1.18 x 10 -1

2.33 x 10 -2

1.57 x 10 -1

20

1.26 x 10 -1

2.28 x 10 -2

1.26 x 10 -1

2.28 x 10 -2

1.17 x 10 -1

20L

9.88 x 10 -2

1.92 x 10 -2

9.88 x 10 -2

1.92 x 10 -2

1.17 x 10 -1

25

1.12 x 10 -1

2.02 x 10 -2

1.12 x 10 -1

2.02 x 10 -2

9.96 x 10 -2

25L

8.23 x 10 -2

1.70 x 10 -2

8.23 x 10 -2

1.70 x 10 -2

9.96 x 10 -2

30

8.97 x 10 -2

1.73 x 10 -2

8.97 x 10 -2

1.73 x 10 -2

8.24 x 10 -2

30L

7.05 x 10 -2

1.44 x 10 -2

7.05 x 10 -2

1.44 x 10 -2

8.24 x 10 -2

35

7.85 x 10 -2

1.56 x 10 -2

7.85 x 10 -2

1.56 x 10 -2

6.69 x 10 -2

35L

7.05 x 10 -2

1.29 x 10 -2

6.17 x 10 -2 6.73 x 10 -2

1.29 x 10 -2 1.21 x 10 -2

6.69 x 10 -2 5.20 x 10 -2

1.21 x 10

-2

45

6.73 x 10 -2

1.01 x 10

5.22 x 10 -2

1.01 x 10 -2

5.20 x 10 -2

-2

45L

5.22 x 10 -2

Tab.23

K A 1 : equivalent factor in the MY (axial direction) when one MGB block is used. K A 2 : equivalent factor in the MY (axial direction) when two MGB blocks are used in close contact with each other. K B 1 : MZ equivalent factor when one MGB block is used. K B 2 : MZ equivalent factor when two MGB blocks are used in close contact with each other. K C: equivalent factor in the MX (radial direction).

■ Static safety factor The specified static load capacity for each carriage represents the maximum permissible load value. Exceeding this value can cause permanent deformation of the raceways and negatively affect running performance. Checking the load must be done as follows : □ Through determination of the simultaneous forces and moments acting on each carriage. □ By comparison of these values with the corresponding load capacities. In particular, if the system starts and stops frequently, if a cutting load acts on the system, or if a large moment caused by an overhanging load is applied, it may experience an unexpectedly large load. When selecting a model number, make sure that the desired model is capable of supporting the required maximum load (whether stationary or in motion). Guidelines for the static safety factor are shown in the table to the right.

Lower limit of fs

Load conditions*

Without vibrations or impacts

2 or greater

With vibrations or impacts

5 or greater

*In general, factors that cause vibration and impacts include acceleration and deceleration, sudden starts and stops, transmission of vibration and impacts from external devices and machines, and changes in processing force over time.

Tab.24

f S : Static safety factor C 0rad : Basic static radial load rating (N) P max : Maximum applied load (N)

The equivalent load P corresponds in its effects to the sum of the forces and moments working simultaneously on a sli der. If these different load components are known, P results from the equation below:

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