Musings on Reliability and Maintenance Topics

Short essays and thoughts (musings) on reliability and maintenance engineering topics.

Let me know your reaction and thought, plus any questions.

ISSN 2329-0080

The Environmental and Use Manual

Environmental and Use Manual

How well can you describe the use conditions your product will experience?

How well do you need to know the use conditions?

For some situations, the environment for your product is assessable, others are not. For some situations, we guess the range of expected stresses, others we measure.

The design process and the myriad decisions that impact product reliability rely on characterized environmental stresses.

A great place to consolidate how and where customers will use your product (including the relevant stress factors) is in an environmental manual. [Read more…]

by Fred Schenkelberg 3 Comments

Asking Questions is Reliability Engineering

Finding solutions is reliability engineering too.

Have you noticed that finding solutions often requires just the right question, the proper framing of the issue, the query that reveals the problem and solution?

One of the best ways to lead a team and provide a focus on reliability performance is to ask the right questions.

Understanding objectives, risks, and failures is what we primarily do as reliability professionals. We work with teams to achieve or improve reliability performance.

We ask questions. [Read more…]

by Fred Schenkelberg Leave a Comment

Adjusting to Customer Expectations Changing

Customers Expectations Tend Toward Better Reliability Over Time

Reliability goals or objectives are just a starting point.

You goals represent your target at one point in time.

At best they represent what your customers expect for reliability performance at one point in time.

When goals are set well, they anticipate what your customer expects when they receive your product. In a perfect world, you customer will find the reliability performance just a bit better than expected.

It’s not a perfect world. [Read more…]

by Fred Schenkelberg Leave a Comment

Introduction to Ongoing Reliability Testing

This type of reliability may have different names. A quick search of a few references in my library and I didn’t find ongoing reliability testing, ORT, in any of them.

It does exist and you may have heard of it before or even use some form of ORT. Or not.

Ongoing reliability testing or ORT is the continued evaluation of your product typically using samples drawn from production. The testing evaluates the reliability performance of recent production units.

The focus is on finding anomalies or changes that may occur in the design, supply chain, or production process that significantly changes field reliability performance. [Read more…]

by Fred Schenkelberg 2 Comments

When Management Doesn’t Listen

A Bloomberg articles details the Takata airbag recall series of events. The line that caught my attention is:

…company documents suggesting that Takata executives discounted concerns from their own employees and hid the potential danger…

“Sixty Million Car Bombs: Inside Takata’s Airbag Crisis”, Susan Berfield, et.al. Bloomberg Business Week, posted June 2^nd, 2016, https://www.bloomberg.com/news/features/2016-06-02/sixty-million-car-bombs-inside-takata-s-air-bag-crisis

There are other examples where management doesn’t seem to listen when engineers raise concerns. Have we cried wolf too often? Has management gotten used to taken risks as a good business practice?

At times reliability risks are real and need to be clearly communicated. Let’s talk about how you can effectively get the message across. [Read more…]

by Fred Schenkelberg 1 Comment

Introduction to the 6 Sigma Design Approach

Sigma, σ, is the Greek character we use to represent standard deviation. 6 σ represents the spread of data about the mean. For data with a normal distribution 6 σ includes 99.7% of the data.

The 6 σ design approach incorporates knowledge of the variation that will occur within the design such that the design has is unlikely to fail.

According to Mikel J. Harry, the foundation of excellence in product quality rests on achieving six sigma product quality. [1] [Read more…]

by Fred Schenkelberg 2 Comments

The Fundamental Set of Reliability Engineering Tools

In a single meeting, you may need to structure a reliability model, create estimates, outline test plans, and discuss a field failure. The breadth of tools and knowledge to be effective is staggering.

No two problems, questions, situations, or industries are the same. Thus, the solutions you provide must differ as well. If you enjoy a complete set of reliability engineering tools at your disposal, you are well situated to address any question.

[Read more…]

by Fred Schenkelberg Leave a Comment

Plot Your Derating Guidelines

The concept of derating is similar to the mechanical engineering concept of a stress–strength analysis.

The intent is to ensure that the selected component or the mechanical design has sufficient strength to withstand the expected applied stresses.

Components operating at or near their rated values have short lives. Consequently, the general practice is to use components for materials well below their rated values to extend the operating life of the items.

This is where derating comes into play. [Read more…]

by Fred Schenkelberg Leave a Comment

Introduction to Derating

Derating is the selection of components and materials according to a set of standardized safety-margin definitions.

It is used by design engineers to ensure the selected elements of the design do not experience performance problems due to overstress conditions.

Derating, like stress-strength analysis, assists the designer when selecting elements for the product or system.

The outcome is a robust design able to withstand the expected, and some of the unexpected, stress applied. [Read more…]

by Fred Schenkelberg 5 Comments

Starting a Career in Reliability Engineering

Reliability engineers all have a start.

A point zero.

The transition point from pursuing something else, or nothing at all, then we begin our journey as a reliability engineering professional.

Getting started can be difficult and at times overwhelming.

Then you find Accendo Reliability and there is a lot of great content, maybe too much. So, this short article has the intent to create a starting point for you.

Plus, for those well along in their career, a request.

What is your advice to those just starting their career? My plan is to gather the advice from this community and assembly a start here guide just for those just starting their career.

Leave a comment below with your words of wisdom. [Read more…]

by Fred Schenkelberg Leave a Comment

5 Ways You Know a Reliability Program is Working

When your reliability program is working well, it may be difficult to recognize the benefits incurred.

Likewise, when the program is not working, it is obvious.

As you work to improve your program, keep in mind you may need to include elements to ensure your efforts remain visible.

I don’t mean staging field issues that you can solve quickly, rather that you are able to show the impact you and your program make to the organization. [Read more…]

by Fred Schenkelberg Leave a Comment

Reliability Questions to Ask Your Suppliers

Here’s a question for you: Do you ask your suppliers the right questions concerning reliability?

Probably not.

If you are getting the right information from your suppliers, then you would enjoy few supplier related field issues, or as little downtime or low warranty costs.

Asking the right set of questions will help you gain the understanding you need to improve your reliability performance. [Read more…]

by Fred Schenkelberg Leave a Comment

Rewards and Incentives Have an Impact On Reliability

A maxim of business management is to measure what is important.

The focus on aligning metrics, rewards, and incentives is not a new concept. Many businesses create target focused incentives with the expectation it will assist achieving those important business goals.

In many cases, simply monitoring a metric improve the team’s ability to achieve a specific goal.

In some cases, though, achieving the goal and associated incentive has an associated negative impact on the business.

If you offer a bonus for a short-term behavior or goal and offer nothing to balance with the long-term impact.

Your incentive may actually damage your business in the long term. [Read more…]

by Fred Schenkelberg Leave a Comment

Are Prototypes Useful for Reliability Estimates

Prototypes are precious items. A vendor sample or beta version of factory parts may provide necessary insights.

They are not real though.

The prototypes and samples we hold, admire, examine and test are just a representation of the final product or system.

It is extremely rare we will learn exactly what we need to know with these few items. [Read more…]

by Fred Schenkelberg 2 Comments

The Role of Legends in Your Reliability Program

One of my favorite things to do when visiting a new company, it at lunch or during a break, ask:

“Any major disasters that impacted reliability?”

Typically, there are three stories that start with, “Remember the… “, or, “One time…”

It seems every organization has legendary stories in the organizational memory. [Read more…]

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