Davis Balestracci’s picture

By Davis Balestracci

Suppose you had 16 months of data on an important process (as plotted on the run chart seen in figure 1). For improvement purposes, an intervention was made after the sixth observation to lower this key process indicator. This intervention is equivalent to creating a special cause for a desired effect.

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By Quality Digest

Here’s a story that proves once again that exciting quality applications can occur anywhere in the world.

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By Quality Digest


Veriteq software at Teledyne technologies

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By Nicolette Dalpino

Cequent Transportation Accessories, a division of TriMas Corp., located in Bloomfield Hills, Michigan, designs and manufactures a broad range of accessories for light trucks, SUVs, recreational vehicles, passenger cars, and trailers. The company has a long history of using enterprise quality management to drive market success.

Dirk Dusharme @ Quality Digest’s picture

By Dirk Dusharme @ Quality Digest

I always look forward to this time of year. Not in anticipation of prezzies under the tree, but for what changes 2009 will bring.

First, this issue brings you the last columns for two long-time columnists.

Nicolette Dalpino’s default image

By Nicolette Dalpino


IMTS Posts Biggest Attendance in Years

The International Manufacturing Technology Show 2008, held in Chicago, Illinois, September 8-13, posted its largest attendance since the year 2000. Total registration for the six-day event was 92,450, with 1,803 exhibiting companies.

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By WENZEL Group

The hydraulic casting components made at Rexroth Guss, a subsidiary of Bosch Rexroth, are characterized by their complex, core-intensive construction and many free-form surfaces. These costly parts, made of cast iron or spheroidal graphite iron, are invariably designed in 3-D CAD software. The transition from 2-D to 3-D design prompted the quality department to look for an appropriate measuring solution to inspect their parts.

Davis Balestracci’s picture

By Davis Balestracci

Take a look at the control chart in figure 1. There are no observations outside the common-cause limits, but there are five special-cause flags:

Observation 5: Two out of three consecutive points greater than two standard deviations away from the mean

Observations 21 and 30-32: Four out of five consecutive points greater than one standard deviation away from the mean

Nicolette Dalpino and Carey Wilson’s default image

By Nicolette Dalpino and Carey Wilson

Short on News