Automotion Components Linear Ball Bushings
What is...
Product Selection
L1706
Closed, open + adjustable
L1712
Double compliment versions
L1715
Compact versions
L1718
Front flanged standard
L1723
Front flanged double compliment
L1731
Centre flanged double compliment
L1740
Superball bushings
L1750
closed linear carriage
L1753
Open linear carriage
General Guidance
Linear ball bushings
Applications
- Computers and peripheral equipment.
- Recording equipment.
- Linear motion systems.
- Multi-axis drilling machine.
- Printing machines.
- Food packaging machines.
- Punching presses.
- Tool grinders.
- Assembly systems.
- Card selectors.
Interchangeability
Our linear bushing systems are designed to have full interchangeability, with other manufacturers’ parts. For shafting see part numbers L1770 to L1785.
High precision retainer
The single body retainer guides 4-6 ball circuits. It precisely guides the balls with a smooth motion.
Tolerance of housing bore
Normal fit is standard, pressed fit is for without clearance.
| Part no. | Normal fit | Pressed fit |
| L1706 to L1733 | H7 | K6, J6 |
| L1706...-1 to L1733...-1 | H7 | J7 |
Rigid outer sleeve
The hardened and precisely ground outer sleeve is made of bearing steel.
L1750 bushing carriages
Consists of light aluminium case and L1706 type linear bushing, so the installation can be finished simply by bolting. Longer life can be obtained by adjusting the orientation of the ball circuits in the linear carriage element against the direction of load.
Tolerance of shaft
| Part no. | Normal fit | Tight fit |
| L1706 to L1733 | h6 | k6 |
| L1706...-1 to L1733...-1 | f6, g6 | h6 |
Basic dynamic load rating C
The basic dynamic load rating is defined as the constant load both in direction and magnitude under which a group of identical linear bushings are individually operated. 90% of the units can travel 50Km without failing due to rolling contact fatigue.
Basic static load rating C0
If a linear bushing is subject to an excessive load or impact, a permanent deformation occurs between the raceway and the rolling element. The basic static load rating is defined as the static load that gives a prescribed constant contact stress at the centre of the contact area between the rolling element and raceway receiving the maximum load.
Superball linear ball bushings
- 3 x the load rating and 27 x the travel life of conventional linear bushings
- Self-aligning feature
Features
Higher load ratings
The uniquely designed ball plate (in the outside diameter of the bushing), is made of hardened steel. The precision ground groove is slightly larger than the ball size, which provides greater contact area between the balls and the ball plate, and as a result, provides 3 x higher load ratings of conventional linear bushings.
Self-alignment
The ball plate has a convex shape to provide a pivot point at the centre which allows self-alignment up to ±0.5°. This self-alignment capability eliminates any possibility of edge pressure caused by inaccurate machining, errors on mounting, or shaft deflection.
Tolerance of shaft and housing bore
| Part no. | Shaft Ø d1 | Tol. h6 μ | Housing bore Ø d2 | Tol. H7 μ |
| L1740.010 | 10 | +0 to - 9 | 19 | +21 to -0 |
| L1740.012 | 12 | +0 to - 11 | 22 | +21 to -0 |
| L1740.016 | 16 | +0 to - 11 | 26 | +21 to -0 |
| L1740.020 | 20 | +0 to - 13 | 32 | +25 to -0 |
| L1740.025 | 25 | +0 to - 13 | 40 | +25 to -0 |
| L1740.030 | 30 | +0 to - 13 | 47 | +25 to -0 |
| L1740.040 | 40 | +0 to - 16 | 62 | +30 to -0 |
| L1740.050 | 50 | +0 to - 16 | 75 | +30 to -0 |
Installation
Standard type
Mounted with circlips
Mounted with adapter plates
| For shaft Ø | External (for Shaft) | Internal (for Bore) |
| 5 | P0380.012-A2 | P0381.012-A2 |
| 6 | P0380.012-A2 | P0381.012-A2 |
| 8 | P0380.016-A2 | P0381.016-A2 |
| 10 | P0380.019-A2 | P0381.019-A2 |
| 12 | P0380.022-A2 | P0381.022-A2 |
| 16 | P0380.026-A2 | P0381.026-A2 |
| 20 | P0380.032-A2 | P0381.032-A2 |
| 25 | P0380.040-A2 | P0381.040-A2 |
| 30 | P0380.048-A2 | P0381.047-A2 |
| 40 | P0380.065-A2 | P0381.062-A2 |
| 50 | P0380.075-A2 | P0381.075-A2 |
| 60 | P0380.090-A2 | P0381.090-A2 |
Flange type
See part tolerances for perpendicularity accuracy when outer sleeve is used as datum for installation.
Adjustable type bearings
Adjustment of clearance (for adjustable type bearings and shafts), is achieved with an adjustable housing assembly (as shown below). In this case, the slotted side of linear bushing should be located at 90° to the open side of housing for equal radial deformation.
When moment load applies
External loads should be distributed uniformly on a linear bushing. When moment loads are applied, two or more linear bushings should be used on one shaft, and the distance between the two linear bushings should have adequate spacing. Calculate the equivalent load when the moment loads are applied and choose the correct linear bushing.
Mounting of adjustable type bearing
Open type bearings
Open type bearings can be used with a clearance adjustable housing as shown below. Light preload is applied for normal use, heavy preload should be avoided.
Mounting of open type bearing
L1750 Bushing carriages
L1750 carriages can be mounted from both the top or the bottom, minimising assembly time.
Mounting of case unit
Fixing holes
Carriage fixing holes are threaded from the top a certain distance down. Fixing holes from the bottom are through holes so the screw size when mounting from below needs to be smaller than the thread size if you were mounting from the top.
Application tips
For mounting a standard type linear bushing into a housing, a jig should be used to avoid directly striking the outer sleeve or seal during installation.
Mounting into housing
Insertion of shaft
Care must be taken when inserting a shaft into a linear bushing. If the shaft is inserted incorrectly, the ball retaining cage may be damaged and the balls loosened from position.
Insertion of shaft into linear bushing
Rotational motion prohibited
Linear bushing are not suitable for rotational motion. If the linear bushing is exposed to rotational motion it may lead to unexpected accidents.
