MGB EN

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MGB EN data sheet - rev.1.1

MGB Data sheet - rev. 1.1

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MGB | Data sheet

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MGB | Data sheet

Index

Ordering key.....................................................................................................................................................4

Features and advantages........................................................................................................................5

Components and dimensions..............................................................................................................6

Accessories........................................................................................................................................................13

Use and maintenance..............................................................................................................................19

Static load and service life.....................................................................................................................22

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MGB | Data sheet

ORDERING KEY

■ Rail / block system MGB 35 01240 N -

/2/ MGB 35 -

K0 K1 K2

H F

W C L D

First hole position [mm]

Preload class Sealing type : A = End seals + side seals, C = End seals + side seals + metal scrapers, D = Double seals + side seals, E = Double seals + side seals + metal scrapers

LW E

Block type : - = Flanged type, W = Narrow type, L = Flanged long, LW = Narrow long

Size

Block series

Number of blocks

Hole type: - = counterbored, F= bottom threading

Accuracy class: N= Normal, H= High

Rail length [mm]

Size

Rail series Ordering example: MGB35-01240N/2/MGB35WAK0 G=20mm

■ Rail

MGB 35

-01240 N -

H F

First hole position [mm]

Hole type: - = counterbored, F= bottom threading

Accuracy class: N= Normal, H= High

Rail length [mm]

Size

Series Ordering example: MGB35-01240N G=20mm Joined rail: MGB35-05840N G=20mm - Rail composition 2x2920 ■ Block MGB 35 - N K0 A W H K1 C L K2 D LW E

Sealing type : A = End seals + side seals, C = End seals + side seals + metal scrapers, D = Double seals + side seals, E = Double seals + side seals + metal scrapers

Preload class

Accuracy class: N= Normal, H= High

Block type: - = Flanged type, W = Narrow type, L = Flanged type long, LW = Narrow long

Size

Series Ordering example: MGB35LNK0A

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MGB | Data sheet

FEATURES AND ADVANTAGES

Fig.1

MGB are profiled recirculating ball guides with hardened raceways, engineered for high load capacity and stiffness. MGB rails offer excellent performance for high precision, stiffness and load capacity. They incorporate four rows of balls, each positioned at a 45° contact angle. This configuration ensures uniform load dis tribution in all four directions and allows reliable operation in any installation position: horizontal, vertical, inverted, or inclined. End plates integrated into the block allow continuous ball circulation, while retainer plates prevent ball loss when the block is removed from the rail. The block’s low height con tributes to high structural rigidity, providing stable and pre cise linear motion in demanding applications. MGB guides can be preloaded to further enhance rigidity while maintaining a constant, low friction coefficient. With their optimized geometry, they offer a compact solution that combines long service life, consistent performance, and high accuracy even under challenging operating con ditions. MGB rails are particularly suitable for demanding applica tions in construction and mechanical engineering, packag ing machinery, logistics systems and medical technology, as well as in the industrial machinery and electronics indus tries.

■ Available sizes: 15, 20, 25, 30, 35, 45. ■ Max. operating speed: 5 m/s (196.85 in/s). ■ Temperature range: -20 °C to +80 °C (-4 F to 176 F). Performance characteristics

■ Material: Hardened steel. ■ Available rail lengths: up to 3000 mm (118.11 in). ■ Special anticorrosion coatings available upon request. ■ Max rail length in one piece: 3000 mm (118.11 in). Junction possible. Rails

■ Material: Hardened alloy steel ■ Balls material: Hardened bearing steel ■ Plastic parts: Special material Block

MAIN ADVANTAGES Equal load distribution High rigidity

HIgh durability

High precision Thanks to tight tolerances, smooth motion, and minimal blacklash or preload, MGB ensure accu rate, repeatable posi tioning for demand ing applications.

Versatility

The 45° contact an gle of the balls helps ensure uniform load capacity in all four directions.

Preloading capability increases rigidity in every direction while maintaining smooth motion.

The hardened race ways provide wear resistance, support ing a long service life even under heavy loads.

The ability to operate in any orientation, combined with a compact design, makes the MGB guide a highly versa tile solution.

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MGB | Data sheet

COMPONENTS AND DIMENSIONS

■ Rail - counterbored

d₂

M 1

(g)

Length

Fig.2

Size

Width W1 ±0.05 [mm]

Height

Pitch

Mounting hole

Maximum length in one piece

Standard G, g refer to Max length

Weight

M1 [mm]

F [mm]

d1 x d2 x h [mm]

[mm]

[kg/m]

4.5 x 7.5 x 5.3

3000

1.5

20,40

6 x 9.5 x 8.5

3000

20,40

2.3

7 x 11 x 9

3000

20,40

3.3

9 x 14 x 12

3000

20,20

4.8

9 x 14 x 12

3000

20,20

6.6

105

14 x 20 x 17

3000

20,40

Tab.1

Size

Pitch

Standard length

Standard G, g

F [mm]

[mm]

160, 220, 280, 340, 400, 460, 520, 580, 640, 700, 760, 820, 880, 940, 1000, 1060, 1120, 1180, 1240, 1300, 1360, 1420, 1480, 1540, 1600, 1660, 1720, 1780, 1840, 1900, 1960, 2020, 2080, 2140, 2200, 2260, 2320, 2380, 2420, 2440, 2500, 2560, 2620, 2680, 2740, 2800, 2860, 2920, 2980 200, 280, 360, 440, 520, 600, 680, 760, 840, 920, 1000, 1080, 1160, 1240, 1320, 1400, 1480, 1560, 1640, 1720, 1800, 1880, 1960, 2040, 2120, 2200, 2280, 2360, 2440, 2520, 2600, 2680, 2760, 2840, 2920, 3000

20,20

250, 355, 460, 565, 670, 775, 880, 985, 1090, 1195, 1300, 1405, 1510, 1615, 1720, 1825, 1930, 2035, 2140, 2245, 2350, 2455, 2560, 2665, 2770, 2875, 2980

105

Tab.2

■ Joined rails Guide rails longer than the maximum length in one piece are put together from two or more rails. During the assembly you must match the corresponding numbers, see Fg. 3. In case the same hole pitch at joint as the rest of the rail is a requirement, the length of each segment must have G, g di mensions equal to half the hole pitch: size 15/20/25 G, g = 30; size 30/35 G, g = 40; size 45 G, g = 52.5 [mm].

Joined length

Joint

A1 A1

A2 A2

Joint marks

While ordering joined rails, please specify the sequence rails required.

Fig.3

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MGB | Data sheet

■ Rail - bottom tapped-hole

M 1

L 1

S 1

( g )

Length

Fig.4

Size

Width [mm] W1 ±0.05

Height

Pitch

Mounting hole

Maximum length in one piece

Standard G, g refer to Max length

Weight

M1 [mm]

F [mm]

S1 x L1 [mm]

[mm]

[kg/m]

M5 x 8

3000

1.5

20,40

M6 x 10

3000

20,40

2.3

M6 x 12

3000

20,40

3.3

M8 x 15

3000

20,20

4.8

M8 x 17

3000

20,20

6.6

105

M12 x 24

3000

20,40

Tab.3

Size

Pitch

Standard length

Standard G, g

F [mm]

[mm]

20,20

250, 355, 460, 565, 670, 775, 880, 985, 1090, 1195, 1300, 1405, 1510, 1615, 1720, 1825, 1930, 2035, 2140, 2245, 2350, 2455, 2560, 2665, 2770, 2875, 2980

105

Tab.4

■ Joined rails Guide rails longer than the maximum length in one piece are put together from two or more rails. During the assembly you must match the corresponding numbers, see Fg. 5. In case the same hole pitch at joint as the rest of the rail is a requirement, the length of each segment must have G, g di mensions equal to half the hole pitch: size 15/20/25 G, g = 30; size 30/35 G, g = 40; size 45 G, g = 52.5 [mm].

Joined length

Joint

A1 A1

A2 A2

Joint marks

While ordering joined rails, please specify the sequence rails required.

Fig.5

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MGB | Data sheet

■ Block - Flanged type - standard and long block

（ E ）

L* L C

W B

4-S

（

φ H through ）

t T

（K）

（ H ）

W W **

Size 15 to 35

Size 45

（ E ）

L* L C

4-S

（

φ H through ）

（ K ）

（ H ）

W **

* If additional sealing options are used, the dimension L changes, see Tb. 12 Pg 14. ** See Pg. 6, 7

Fig.6

External dimensions

Weight

Model

Block dimensions

[mm]

[kg]

Height M [mm]

Width W [mm]

Length L* [mm]

[mm]

56.6

38.8

0.2

MGB15 MGB15L

24 47

38 30 M5 4.4

7 19.3 4.3 5.5 16 4.7

74.6

56.8

0.29

50.8

0.35

MGB20 MGB20L

30 63

53 40 M6 5.4

10 9.5 10 26 5 12 21.5 4

66.8

0.47

83.1

59.5

0.59

MGB25 MGB25L

36 70

57 45 M8 6.8

16 11

10 30.5 6 12 23.5 5.5

102.2

78.6

0.75

70.4

1.1

MGB30 MGB30L

42 90

72 52 M10 8.5

18 9 1035 7 12 31

120.6

1.3

109.4

80.4

1.6

MGB35 MGB35L

48 100

82 62 M10 8.5

12 13 40.5 8 12 33 7.5

134.8

105.8

2.0

138.9

2.8

MGB45 MGB45L

60 120

100 80 M12 10.5

25 13 13 50 10 16 37.5 10

170.7

129.8

3.3

* If additional sealing options are used, the dimension L changes, see Tb. 12 Pg 14.

Tab.5

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MGB | Data sheet

■ Block - Narrow type - standard and long block

（ E ）

L* L C

4-S×ℓ

（ K ）

（ H ）

Size 15 to 35

W **

Size 45

（ E ）

4-S× ℓ

L₁ C

（ K ）

（ H ）

W W **

* If additional sealing options are used, the dimension L changes, see Tb. 12 Pg 14. ** See Pg. 6, 7

Fig.7

External dimensions

Weight

Model

Block dimensions

[mm]

[kg]

S x l [mm]

L 1

Height M [mm]

Width W [mm]

Length L* [mm]

[mm]

56.6

38.8

0.18

MGB15W MGB15LW

28 34

M4 x 5

23.3 8.3

5.5

9.5 4.7

74.6

56.8

0.26

50.8

0.25

MGB20W MGB20LW

30 44

M5 x 6

66.8

0.35

83.1

59.5

0.54

MGB25W MGB25LW

40 48

M6 x 8

9 34.5 10

12.5 5.5

102.2

78.6

0.67

70.4

0.9

MGB30W MGB30LW

45 60

M8 x 10

120.6

1.1

109.4

80.4

1.5

MGB35W MGB35LW

M8 x 12

11.7 47.5

18 7.5

134.8

105.8

2.0

138.9

2.6

MGB45W MGB45LW

60 20 16 20.5 10

70 86

M10 x 17

170.7

129.8

3.1

* If additional sealing options are used, the dimension L changes, see Tb. 12 Pg 14.

Tab.6

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MGB | Data sheet

■ Load capacities and static moments

M X

C C 0ax

M Y

C C 0rad

M Z

Fig.8

Model

Basic load rating

Static permissible moment* [Nm]

C 100 [N]

C 0rad ,C 0ax [N]

M y

M z

M x

1 block

2 blocks

1 block

2 blocks

1 block

8651

15700

94.5

527

94.5

527

99.8

MGB15 / MGB15W MGB15L / MGB15LW

11270

22900

194

984

194

984

145

15714

27400

218

1200

218

1200

235

MGB20 / MGB20W MGB20L / MGB20LW

18968

35800

363

1870

363

1870

307

21905

36400

324

1800

324

1800

366

MGB25 / MGB25W MGB25L / MGB25LW

27937

51600

627

3040

627

3040

518

32143

53700

599

3100

599

3100

652

MGB30 / MGB30W MGB30L / MGB30LW

38810 70200

995

4890

995

4890

852

42778

70200

895

4510

895

4510

1050

MGB35 / MGB35W MGB35L / MGB35LW

51587

91700

1490 1500

7130

1490 1500

7130

1370

65238 101000

8370

1940

MGB45 / MGB45W MGB45L / MGB45LW

79365

135000

2590

13400

2590

13400

2600

Tab.7

* Static permissible moment. 1 block: static permissible moment value with 1 block. 2 blocks: static permissible moment value with 2 blocks in contact.

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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.

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

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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MGB | Data sheet

■ Linear accuracy Refers to the tolerance for parallelism between the MGB block and the MGB rail datum surface when the MGB block travels the whole length of the MGB rail bolted to a reference surface.

Linear accuracy value

MGB rail length [mm]

Above

Or less

Normal grade [μm]

Linear accuracy of surface C against A

200

Linear accuracy of surface D against B

200

250

315

400

500

360

Reference surface

630

800

1000

Fig.11

1000

1250

1600

2000

2500

3000

Tab.10

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MGB | Data sheet

ACCESSORIES

It is necessary to prevent foreign materials from getting inside the product, as it will lead to abnormal wear and a shortened service life. If it is likely that foreign materials will get inside, it is important to select an effective sealing or contamination protection device suited to the environmental conditions.

■ Seals End seals made of synthetic rubber that are highly resistant to wear and side seals that further improve dust-proofing effectiveness are available. Use the symbols in the table to the right to specify if you need a contamination protection accessory.

■ Option compatibility

Contamination protection accessories

Symbol

End seals + side seals

Double seals + side seals

End seals + side seals + metal scrapers

Double seals + side seals + metal scrapers Tab.11

■ End seal Used in applications exposed to dust.

■ Side seal Used in applications where dust may enter the block from the side or bottom surfaces, such as vertical, horizontal, and inverted configurations.

End seal

Side seal

Fig.12

Fig.13

■ Double seals Used in applications exposed to excessive dust or cutting chips.

■ Metal scraper (Non-Contact) Used in applications where welding spatter may adhere to the MGB rail.

End seal

Metal scraper

End seal

Spacer

Metal scraper

End seal

Hexagon socket button bolt

Fig.14

Fig.15

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MGB | Data sheet

■ MGB block dimension with seals

Fig.16

Model series

L [mm]

L [mm] 58.2*

L [mm] 63.4*

MGB15 / MGB15W

56.6

61.8

MGB15L / MGB15LW

74.6

79.8

76.2

81.4

MGB20 / MGB20W

80.6

76.6

83.2

MGB20L / MGB20LW

96.6

92.6

99.2

MGB25 / MGB25W

83.1

90.7

86.7

94.3

MGB25L / MGB25LW

102.2

109.8

105.8

113.4

MGB30 / MGB30W

105.6

101.6

109.2

MGB30L / MGB30LW

120.6

128.2

124.2

131.8

MGB35 / MGB35W

109.4

117

113

120.6

MGB35L / MGB35LW

134.8

142.4

138.4

146

MGB45 / MGB45W

138.9

146.1

144.1

151.3

MGB45L / MGB45LW

170.7

177.9

175.9

183.1

Tab.12

* Grease nipple cannot be installed.

■ Caps

MGB20/25/30/35/45-CAP

MGB15-CAP

Fig.17

Size

Cap model

Screw

[mm]

MGB15-CAP

7.9

MGB20-CAP

9.8

2.6

MGB25-CAP

11.4

2.6

30, 35

MGB30/35-CAP

14.4

3.3

MGB45-CAP

M12

20.4

3.4

Tab.13

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MGB | Data sheet

■ Grease nipples

Model

Nipple

5.5

9.2

1.5

MGB15 / MGB15W MGB15L / MGB15LW

11.5

7.5

M6×0.75

MGB20 / MGB20W MGB20L / MGB20LW

5.5

9.2

1.5

5.5

11.5

9.2

1.5

MGB25 / MGB25W MGB25L / MGB25LW

7.5

11.5

MGB30 / MGB30W MGB30L / MGB30LW

M6×0.75

12 11.5

M6×0.75

MGB35 / MGB35W MGB35L / MGB35LW

12.5

11.5

1/8”

12.5

MGB45 / MGB45W MGB45L / MGB45LW

11.5

12.5

1/8”

Tab.14

1/8”

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MGB | Data sheet

■ Clamping elements

MGB rails can be secured with manual or pneumatic clamping elements. Areas of application are: ■ Table cross beams and sliding beds ■ Width adjustment, stops ■ Positioning of optical equipment and measuring tables

■ Manual clamp elements HK

The HK series is a manually activated clamping element. Contact profiles press synchronously on the free surfaces of the profile rail by using the freely adjustable clamping lever. The floating mounted contact profiles guarantee symmetrical distribution of force on the guide rail.

Special characteristics of the clamping elements HK: ■ Simple and safe design ■ Floating contact profile ■ Precise positioning ■ Holding force up to 2,000 N

Adapter plate(see Pg. 18, Tb. 17)

H 1 H 3

g 1

An additional adapter plate must be used depending on the height of the carriage (see Pg. 18, Tb. 17).

Activation: Standard with hand lever, further activation options, e.g. using DIN 912 screw, possible on request.

H 2

P 2

M (4 Threads)

Adapter plate(see Pg. 18, Tb. 17)

H 1 H 3

g 1

P 1

W 1

W 2

H 2

Fig.18

* Changed dimensions when using the adapter plate, see Pag. 18, Tab. 17

P 2

Clamping element

Size Holding force

Tightening torque

Dimensions

M (4 Threads)

[N]

[Nm]

[mm]

H 1

H 2

H 3

W W 1

W 2

P 1

P 2 17

g 1

P 1

HK1501A 15

24 12.5 6.5

44 47 30.5 33.5 24

W 1

1200

HK2001A 20

60 38.5 41.5

W 2

HK2501A 25

36 16.2

70 40.6 43.6 30 20 20

8 M6

HK3001A 30

42 23.6 10

HK3501A 35

2000 15

48 27

100

46.5 50.5

24 24 10 M8

HK4501A 45

60 32.6 16

120

44 26

14 M10

Tab.15

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MGB | Data sheet

■ Pneumatic clamp elements MK/MKS

The patented wedge slide gear puts into effect high holding forces. The pressurized medium moves the wedge slide gear in the longitudinal direction. Contact profiles press with high force on the free surfaces of the profile rail by the resulting cross move ment. MK is an element that closes with pneumatic pressure. The MKS closes with spring energy storage and is opened via air pressure.

Areas of application of MK/MKS: ■ Positioning axes ■ Setting vertical axes ■ Positioning lifting gear ■ Clamping machine tables

Special characteristics of clamp elements MK / MKS: ■ Short shape

■ High clamp forces ■ Precise positioning ■ High axial and horizontal rigidity

Adapter plate (see Pg. 18, Tb. 18)

An additional adapter plate must be used depending on the height of the carriage (see Pg. 18, Tb. 18).

W 1

g 1 Connection: The basic MK / MKS series versions are equipped with air connections on both sides, i.e. the factory default settings air connec tions and the ventilation filter can be exchanged to the opposite side surfaces.

B 4

MK closes with nominal air pressure of 6 bar. MKS opens with nominal air pressure of 6 bar.

Activation: ■ MK Clamping with drop in pressure (Normally Open) ■ MKS Clamping without power required (Normally Closed)

W 2

H 2

(MKS)

P 2

Adapter plate (see Pg. 18, Tb. 18)

M (4 Threads)

W 1

g 1

P 1 P 3

B 4

L 1

W 2

∅ Q

H 2

(MKS)

Fig.19

* Changed dimensions when using the adapter plate, see Pg. 18, Tb. 18

P 2

M (4 Threads)

Clamping element

Size MK

MKS Holding force

Dimensions

Holding force

[mm]

[N]

∅ Q g 1

H H 2

W W 1

W 2

B 4

L 1

P 1

P 2

P 3

MK/MKS1501A 15 650 400 24 2.5 55 5 34 12 58 39 MK/MKS2001A 20 1000 600 30 4.5 66 6 43 14.4 61 L

15 15 15.5 16 4.5 M4

P 1 P 3

L 1

20 5.5 M5

20 20 5

MK/MKS2501A 25 1200 750 36 8 75

49 15.5 56 35

22 8 M6

MK/MKS3001A 30 1750 1050 42 7 90

22 22 8.5 25

20.5

10 M8

MK/MKS3501A 35 2000 1250 45 8.5 100

24 24 7.5 28

∅ Q

(MKS)

MK/MKS4501A 45 2250 1450 60 16.5 120

78.8 26.8 82 49 26 26 11.5 30 15 M10

Tab.16

* Only for model MKS

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MGB | Data sheet

■ Adapter plate

For HK clamps

Clamping element

Size

Model

Adapter plate

MGB15 / MGB15L

HK1501A

MGB15W / MGB15LW

PHK 15-4

HK2001A

MGB20 / MGB20L / MGB20W / MGB20LW

MGB25 / MGB25L

HK2501A

MGB25W / MGB25LW

PHK 25-4

MGB30 / MGB30L

HK3001A

MGB30W / MGB30LW

PHK 30-3

MGB35 / MGB35L

HK3501A

MGB35W / MGB35LW

PMK 35-7

MGB45 / MGB45L

HK4501A

MGB45W / MGB45LW

PHK 45-10

Tab.17

For MK/MKS clamps

Clamping element

Size

Model

Adapter plate

MGB15 / MGB15L

MK/MKS1501A

MGB15W / MGB15LW

PMK 15-4

MK/MKS2001A

MGB20 / MGB20L / MGB20W / MGB20LW

MGB25 / MGB25L

MK/MKS2501A

MGB25W / MGB25LW

PMK 25-4

MGB30 / MGB30L

MK/MKS3001A

MGB30W / MGB30LW

PMK 30-3

MGB35 / MGB35L

PMK 35-3

MK/MKS3501A

MGB35W / MGB35LW

PMK 35-10

MGB45 / MGB45L

MK/MKS4501A

MGB45W / MGB45LW

PM K 45-10

Tab.18

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MGB | Data sheet

USE AND MAINTENANCE

■ Lubrication When using MGB it is necessary to provide effective lubrication. Using the product without lubrication may increase wear on the rolling elements and shorten the service life. A lubricant has effects such as the following. □ Minimizes friction on moving elements to prevent seizure and reduce wear. □ Forms an oil film on the raceway to decrease stress acting on the surface and extend rolling fatigue life. □ Covers metal surfaces with an oil fi lm to prevent the formation of rust. To optimize an MGB Guide’s functionality, it is necessary to provide lubrication according to the operating conditions. We recommend the use of a lithium based lubricant NLGI Class 2 for lubrication. Below are some reference property.

Grease property

Consistency enhancer

Lithium-based

Base oil

Mineral oil

Base oil kinematic viscosity: mm 2 /s (40 °C)

170

Dropping point: °C

193

Operating temperature range: °C

-15 to 100

Color

Yellowish brown

Tab.19

■ Temperature

The MGB series can be used in environments with temperatures from -20 °C to +80 °C (-4 °F to +176 °F ).

■ Block mounting options

Fig.21

Fig.20

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MGB | Data sheet

■ Shoulder height of the mounting base and corner radius The mounting base of the MGB rail and MGB block has a reference surface on the side face to allow easy installation. The height of the datum shoulder varies based on the model. See below for details. The corner of the mounting shoulder must either include a recess or be machined smaller than the corner radius r to prevent interference with the chamfer of the rail or block. The corner radius r values vary depending on the model. See details below.

Rail max. corner radius r1 [mm]

Block max. corner radius r2 [mm]

Rail shoulder height H1 [mm]

Block shoulder height H2 [mm]

Size

[mm]

MGB 15

0.5

4.7

MGB 20

0.5

3.5

MGB 25

5.5

MGB 30

MGB 35

7.5

MGB 45

Tab.20

r 2

H 2

H 3

H 1

r 1

H 1

H 3

MGB block

MGB rail

Fig.22

■ Reference error tolerance for the mounting surface The self-aligning capability of the MGB guide ensures smooth linear motion, even when slight distortions or surface errors are present. □ Reference horizontal error tolerance between two rails Mounting surface error may affect the service life of the MGB guide. The following tables show the approximate reference horizontal error tolerance (P) between two rails in general use.

Normal K0 [μm]

Light preload K1 [μm]

Medium preload K2 [μm]

Size

Fig.23

Reference horizontal error tolerance (P) between two rails.

Tab.21

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MGB | Data sheet

□ Reference vertical error tolerance between two rails Mounting surface errors may affect the service life of the MGB guide. The table shows the value (X) of the reference vertical error tolerance in the axial direction for rail span (a), which is proportional to the rail span (a).

X ＝ X 1

＋ X 2

X 2 X 1 ： Level difference on the block mounting surface ： Level difference on the rail mounting surface

X 2

X 1

Fig.24

Size

Normal clearance K0

Light preload K1

Medium preload K2

0.0006a

0.0005a

0.0006a

0.0005a

0.0004a

0.0006a

0.0005a

0.0004a

0.0006a

0.0005a

0.0004a

0.0006a

0.0005a

0.0004a

0.0006a

0.0005a

0.0004a

Tab.22

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MGB | Data sheet

STATIC LOAD AND SERVICE LIFE

■ Calculating the applied load The MGB rail and block are capable of receiving loads and moments in all directions whether they are generated by the mounting orientation and position, the location of the center of gravity of the moving object, the position of the thrust, the acceleration, or an additional effort, for example the cutting resistance.

M X

C C 0ax

M Y

Axial load

Radial load

C C 0rad

M Z

M Y moment in pitching direction M Z moment in the yawing direction M X moment in the rolling direction

Fig.25

Fig.26

■ Moment equivalence When the space to install the MGB guide is limited, you may have to use only one MGB block, or two MGB blocks in close contact with each other. In such a setting, the load distribution is not uniform. As a result, an excessive load is applied in localized areas (i.e., both ends) as shown in Fig. 27. Continued use under such conditions may result in flaking in those areas, consequently shortening the service life. In such a case, calculate the actual load by multiplying the moment value by any one of the equivalent-moment factors. Close contact refers to a center distance between blocks less than twice the block length L.

Moment load

Rows of balls under a load

MGB rail

Ball displacement line

Load distribution curve

Ball displacement line

Maximum ball deflection

Maximum applied load on a ball

Fig.27

Ball load when a moment is applied.

An equivalent-load equation applicable when a moment is applied to an MGB guide is shown below.

P: equivalent load per MGB guide (N) K: equivalent moment factor M: applied moment (Nm)

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MGB | Data sheet

■ Equivalent factor Since the rated load corresponds to the permissible moment, the equivalent factor used to convert the My, Mz, and Mx moments to the applied load per block is obtained by dividing the rated load in the corresponding direction.

□ Equivalent factors for the M Y moment

M Y

Equivalent factors for the M Y moment Equivalent factor in the axial direction K A =

P A =K A •M Y Equivalent in the axial direction

M Y C 0ax

K A •M Y C 0ax

Fig.28

□ Equivalent factors for the M Z moment

M Z

Equivalent factors for the M Z moment Equivalent factor in the radial directions M Z C 0rad K B =

P R =K B •M Z Equivalent in the radial direction

K B •M Z C 0rad

P R =K B •M Z Equivalent in the radial direction

Fig.29

□ Equivalent factors for the M X moment

M X

Equivalent factors for the M X moment Equivalent factor in the axial direction M X C 0ax K C =

P A =K C •M X Equivalent in the axial direction

K C •M X C 0ax

Fig.30

C 0ax

Basic static load rating (axial direction) [N]

P A

Calculated load (axial direction) [N]

C 0rad

Basic static load rating (radial direction) [N]

P R

Calculated load (radial direction) [N]

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MGB | Data sheet

Size

Equivalent factor

KA 1

KA 2

KB 1

KB 2

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

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

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

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

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

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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MGB | Data sheet

■ Calculating the Nominal Life The nominal life (Lkm) is calculated using the basic dynamic load rating (C100) and the calculated load (P) acting on the MGB guide. For this calculation, the basic dynamic load is based on a nominal life of 100 km. During operation, an MGB rail may be exposed to vibrations, shocks, and fluctuating loads, which are often difficult to quantify. Additionally, operating temperature and block arrangement (especially when blocks are placed directly in line) have a decisive influence on service life. Taking these factors into account, the nominal life (L km ) can be calculated according to the following formula.

L km : Nominal life (km) C 100 : Basic dynamic load rating (N) P: Calculated load (N) f C : Contact factor f W : Load factor

Note: This nominal life formula may not apply when the stroke length is less than or equal to twice the length of the MGB block.

Once the nominal life (L km ) has been obtained, the service life time can be obtained using the following formula if the stroke length and the number of cycles are constant.

L h : Service life time (h) l s : Stroke length (mm) n 1 : Cycles per minute (min -1 )

f C : Contact factor When multiple blocks are installed in close contact with each other, it is difficult to achieve uniform load distribution because of moment loads and mounting surface accuracy. When multiple blocks are used in close contact, multiply the basic load rating (C or C₀) by the corresponding contact factor shown in Tab 25. ‘Close contact’ refers to a center distance between blocks that is less than twice the block length L. Note: If uneven load distribution is expected in large machines, apply the corresponding contact factor from Tab 25. f W : Load factor In general, reciprocating machines are subject to vibrations or impacts during operation. It is difficult to accurately quantify vibrations generated at high speeds and impacts occurring during frequent starts and stops. Therefore, when the effects of speed and vibration are significant, divide the basic dynamic load rating (C) by the load factor (f v ) corresponding to Tab 26, based on empirically obtained data.

Contact factor f C

Number of blocks used in close contact

0.81

0.72

0.66

0.61

6 or more

0.6

Normal use

Tab.25

f W

Speed (V)

Vibrations/ impacts

Very low V≤0.25 m/s

Faint

1 to 1.2

Low 0.25 m/s < V ≤ 1 m/s

Weak

1.2 to 1.5

Medium 1 m/s < V ≤ 2 m/s

Medium

1.5 to 2

High V>2 m/s

Strong

2 to 3.5

Tab.26

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The content of this document and its use are subject to the general terms of sale of ROLLON available on the web site www.rollon.com

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