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Ball screw support unit precision

Views:29     Author:Site Editor     Publish Time: 2020-12-23      Origin:Site

Recently, many customers have come to SCREWTECH to buy ball screw support unit, but they are not aware that the support unit also has different precision. Hope this article can give you a good explanation.


Ball screw support unit has widely application, such as CNC machine tools, semiconductor equipment, automation equipment, medical equipment, petroleum machinery, precision mesuring instruments, mechanical arm, laboratory equipment, aerospace, printing machinery, pharmaceuical packaging machinery,enery enterprises, beverage machinery, food machinery, SCARA robot and other fields.


Support unit C3, C5, C7 requires different precision level. The fixed-end support unit uses 30° or 40° angular contact bearing, and the supported-end unit uses a deep-groove bearing.


C3 fixed end supporting unit uses a P5 bearing and DF type bearing assembly. There is a preload between two bearings to avoid ball screw movement and backlash from the machine. The C3 fixed and support end support unit keeps the shaft and support at good turning accuracy after assembly, due to the precise geometric tolerances between the reference surface and the bearing


C5 support unit is also equipped with P5 bearings and adopts DF type bearing assembly. There is a pre-load between the two bearings to avoid ball screw movement and rebound from the machine


C7 support unit provides P0 bearings, which may or may not be preloaded between the two bearings, which can cause varying backlash values per unit of support, but due to the type of DF bearing assembly, it can support the axial force of the shaft and avoid large Executed when the axis of motion is selected.


Here we share the different tolerances from standard side to the center of different support unit.

Support Unit Level

Applied Ball Screw

Bearing Level

Bearing Preload

Distance Tolerance (b)(mm)

Height Tolerance (h)(mm)

Shaft Tolerance (φD)(mm)

C3

C3

P5

Preload

±0.015

±0.01

g6

C5

C5   or C7

P5

Preload

±0.02

±0.02

g6

C7

C7

P0

N/A

±0.04

±0.03

G8

捕获

Unit: μm

Shaft   Diameter (mm)

Housing Outer Diameter Tolerance

g6

g8

high

low

high

low

high

low

18

30

-7

-20

-7

-40

30

50

-9

-25

-9

-48

50

80

-10

-29

-10

-56

80

120

-12

-34

-12

-66


SCREWTECH is not only ball screw manufacturer and ball screw supplier, but also provide one stop solutions to customers. We are the professional manafacturer of lead screw, ball screw, bearing product, linear mechanical parts. And product quality is the same level as HIWIN, TBI, SKF, NSK brand. If you have any doubts, please contact us!


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