**Rated Life Cycle**

The useful life of a slide is given by the following formula.

* The rated load capacity shown in the technical specifications for each slide is the load for which the slide will achieve an L10 life of 10 million inches when the speed factor, temperature factor, and load type factor are all equal to 1.

- L = life of slide (total travel in inches)
- fr = reliability factor (from above table)
- C = rated load capacity (in pounds)*
- fs = speed factor
- ft = temperature factor
- Pc = calculated effective load (in pounds)
- fw = load type factor
- m = constant (3 for ball slides; 10/3 for roller slides)

How long a ball or roller slide will last under operational conditions depends on many factors. It is customary to allow for variation between samples of the same slide by using the L10 life rating. In this case, the rated life is defined as the total travel (in linear units) that 90% of the same model slide will complete before the first failure. However, the useful life can be calculated for other reliability values as shown by the following table:

Reliability | "L" Rating | Reliability Factor |

99 | L1 | .21 |

97 | L3 | .44 |

95 | L5 | .62 |

90 | L10 | 1.00 |

**Coefficient of Friction**

The average values for the coefficient of friction are as follows:

- Static Friction: 0.0005
- Sliding Friction: 0.0003

**Specifications and Tolerances**

Unless otherwise indicated, the following tolerances are held on the dimensions shown below:

**Accuracy and Repeatability**

Linear straightness accuracy and positioning repeatability are given for each linear motion slide.

Linear straightness accuracy is a composite specification covering deviation from true straight travel in any plane, horizontal or vertical, and is generally measured by use of a gage or electronic indicator, mounted on the moving member of the slide, against a master straightedge or parallel.

Position repeatability is defined as the ability of the slide to repeat the error profile resulting from the measurements described above.

**Dimensions in inches**

- Two (2) place decimal ± 0.01
- Three (3) place decimal ± 0.005

**Dimensions in millimeters**

- One (1) place decimal ± 0.5
- Two (2) place decimal ± 0.05