Category Archive: ISO 9001:2008 Certified

The Importance of Tolerance

A major consideration with any product or component design is cost; taking the cost out of a product is a key function and the bane of many engineers. Identifying creative ways to accomplish this while maintaining a part’s integrity is an important design factor and one which can eat up a great deal of engineering resources. One of the best ways to take cost out of a product, and one which in many cases is overlooked, is tolerance requirements. Over tolerancing parts and assemblies is a major factor in manufacturing cost and tooling. This seems obvious, and certainly most readers would agree, however the reasons that over tolerancing parts happens can be complex and related to more than just an engineering decision.

Tolerance Blog

As a matter of course, many manufacturers and design firms hold comprehensive design reviews before any tooling is made; this results in positive cost reductions such as decreasing material thickness or type, possibly a simpler design that requires less complex tooling, etc. Though tolerances are often an issue of discussion, decreasing tolerances can go against the grain for most engineers. Everyone wants their part to be perfect, and increasing tolerances can be an unsettling issue.

An area that is often overlooked is simple communication between engineers or engineering teams. Interacting or adjacent components may be designed in separate locations, or at different times, causing the specification for related parts to not be readily available; time constraints can also play a major role. Rushing to get a design out for manufacturing, a designer may over tolerance a part just to be sure. For example, if a set of drawings call out the same tolerance throughout, it should raise concern.

To effectively take tolerances out of a manufactured part without harming fit, form and function requires a thorough review, and full understanding of a part’s intended application, and interaction with outside components. Here are a few simple steps that can help avoid over tolerancing:

  • Perform a comprehensive tolerance review at the concept stage of the design process

  • Determine the actual required tolerances.

  • Assess tolerances for features such a slip and press fits, or for outside features, and diameters

  • Determine if there will be any inconsistencies with outside components.

Most importantly, train your engineering staff in the cost of tolerance, and put a dollar amount on it.  Pick a project and calculate how much each tenth of tolerance actually costs, and multiply it by features.

Whatever the reason, and they are limitless, over toleranced parts will cost more, be harder to manufacture, and take longer to produce. Taking the time to get it right the first time will be well worth the extra effort.

Reduce Cost of Metal Stampings Guide

Manor Tool Earns Spot in Quality Magazine’s Leadership 100 Rankings

Manor Tool & Manufacturing has been selected as one of Quality Magazine’s 2013 Quality Leadership 100 companies.

To make this prestigious list, Quality Magazine domestic subscribers were evaluated on a number of factors including quality training, continuous improvement, and internal quality programs, among others. Manor is in good company–Ford Motor Company, Boeing, Chrysler, and Whirlpool also make the list of companies that have shown they are committed to quality.

Quality Leadership 100 Award

At Manor, we ensure quality throughout every step of the manufacturing process. Here are a few of the ways we make this possible:

To learn more about our quality services, click here.

To learn more about the Quality Leadership 100 rankings, click here to watch a video from Quality Magazine.

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