MGB EN

MGB | Data sheet

■ Radial clearance/preload specifications The radial clearance significantly affects the running accuracy, load resistance, and rigidity. Therefore, it is necessary to select a value that is appropriate for the application. An appropriate radial clearance/preload will prevent vibrations and impacts from occurring when the device is running, as well as improve the service life and accuracy of the MGB Guide. The MGB series has three types of radial clearance/preload: normal, light preload, and medium preload.

Normal

Light preload Medium preload

Model number

K0 [μm]

K1 [μm]

K2 [μm]

MGB15

-4 to + 2

-12 to -4

-

MGB20

-5 to + 2

-14 to -5

-23 to -14

MGB25

-6 to + 3

-16 to -6

-26 to -16

MGB30

-7 to + 4

-19 to -7

-31 to -19

MGB35

-8 to + 4

-22 to -8

-35 to -22

MGB45

-10 to + 5

-25 to -10

-40 to -25

Fig.9

Tab.8

■ Accuracy classes and tolerances Difference in Height ΔM: indicates the difference be tween the minimum and maximum values of the height (M) of each MGB Guide used on the same plane in com bination. Difference in Width ΔW 2 : indicates a difference between the minimum and maximum values of the width (W 2 ) between each of the MGB blocks, mounted together on the same rail.

C

D

M

A

B

W 2

Fig.10

For linear accurancy of surface C against A and surface D againts B, please refer to Tb. 10 on Pg. 12.

Item

Normal grade

High accurancy grade

Size

N [μm]

H [μm]

Dimensional tolerance in height M

±0.07

±0.03

Difference in height ΔM

0.02

0.01

15 20

Dimensional tolerance in width W 2

±0.06

±0.03

Difference in width ΔW 2

0.02

0.01

Dimensional tolerance in height M

±0.08

±0.04

Difference in height ΔM

0.02

0.015

25 30 35

Dimensional tolerance in width W 2

±0.07

±0.03

Difference in width ΔW 2

0.025

0.015

Dimensional tolerance in height M

±0.08

±0.04

Difference in height ΔM

0.025

0.015

45

Dimensional tolerance in width W 2

±0.07

±0.04

Difference in width ΔW 2

0.03

0.015

Tab. 9

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