Mean Time Between Failure AKD AKM Gen 1

Summary of Juran's Mean Time Between Failure (MTBF) for AKD & AKM.  Data up through 2014.

Kollmorgen AKD and AKM Products

Purpose

A rough calculation of the Mean Time Between Failure (MTBF) based on historical data. This tool is to be used at a customer's request. MTBF is not "operating life" or "service life".

Source

Juran's Quality Control Handbook 4th Edition. The MTBF estimate is based on R = e^(-t/u) where R is the probability of failure-free operation for a time period equal to or greater than t, e is 2.718…, t is a specific period of failure-free operation, and u is the Mean Time Between Failure. When solving for MTBF, you get:

u = -t / Ln(1 - R)

Assumptions

1.     "All RMA's" / "All Shipments" for a large enough time period is the 'Failure Rate'
2.     'Failure Rate' = 1 - R    (R as defined in the 'Source' Section)
3.     The 'Failure Rate' is constant
4.     All Failures are repaired and placed back into the customer system
5.     The time or 't' is based on the table below. The table assumes a 40 hr. work week, 50 weeks a year. The most recent year of operation will only count for 6 months of operation time. The table is based on cumulative hours