Metrology Features

William Tandler's picture
William Tandler
Continuing with our analysis of the Greatest Design Tool ever, our objective in this article is to take a detailed look at the structure and contents of feature control frames to demonstrate that...
Fred Mason's picture
Fred Mason
Many measurements assume that a measuring device performs in the same way throughout its measuring range. In other words, a 1 mm distance measured near the center of a machine will measure 1 mm at...
William Tandler's picture
William Tandler
What is GD&T, anyway? The Greatest Design Tool ever, or a whole bunch of Gol-Derned Trouble? Actually, geometric dimensioning and tolerancing is both, and worth every penny. Only with the...
Fred Mason's picture
Fred Mason
All this talk about work in past columns—and the end of summer looming—makes me think about golf. You may not discuss golf and measurement in the same breath, but there are a lot of critical...
Fred Mason's picture
Fred Mason
In last month’s column, I talked about the accuracy funnel, which shows that in a measurement system where the sensor or the part is moved in one or more axes, the greater the distance, the...
Fred Mason's picture
Fred Mason
In last month’s column, I talked about the format of accuracy specifications for video measuring machines. The following is a typical format for a single axis accuracy specification: Ex =...
Fred Mason's picture
Fred Mason
Accuracy, repeatability, performance—knowing how to interpret specifications for measuring devices and systems is important. This month I’ll talk about accuracy specifications for...
Fred Mason's picture
Fred Mason
The past few columns about inspection and measurement have led to discussion of different systems for measuring based on images. One type of measurement done via image analysis is...
Richard Curtis Ph.D.'s picture
Richard Curtis Ph.D.
The speed, convenience and cost benefits of microliter volume, air displacement pipettes drive the frequent use of these precision instruments. However, pipettes, like all mechanical instruments,...
Fred Mason's picture
Fred Mason
A metrologist wants to know that any variations in measurements are the result of variations of the parts being measured, not variations in the measuring devices or their users. Subjective...
Fred Mason's picture
Fred Mason
Last month, I talked about vision vs. video and brought up the possibility of confusion between inspection and measurement. Some think that inspection is qualitative and measurement is...
Fred Mason's picture
Fred Mason
Using the eye is visual. The use of magnified imaging by eye or with a camera is a common part of manufacturing. Some of that use is for inspection. Some is for measurement. Some is online...
Michael H. Brill Ph.D.'s picture
Michael H. Brill Ph.D.
As part of a volunteer team that cleared a walking trail in my neighborhood, I helped to shovel a straight path through a small berm. Seeking to solve another problem at the same time, a...
Fred Mason's picture
Fred Mason
It’s New Year’s resolution time. Many of the things we resolve to do in the New Year are measurable—lose weight, run farther or faster, quit smoking, do more of some...
Fred Mason's picture
Fred Mason
Continuing last month’s topic of temperature effects on measurements, what about temperature compensation? Some measuring systems claim increased accuracy with the usually optional temperature...
Fred Mason's picture
Fred Mason
The local environment can be an important factor in the quality of measurements. No matter what is being measured, the higher the resolution of the measurement (the finer the detail), the...
Stephen C. Webb's picture
Stephen C. Webb
Slow monitors that don’t pick up the exact end-point when a part is seated properly can hamper high-volume press-fitting operations. This process-control problem is especially...
Fred Mason's picture
Fred Mason
This is the first “Measurement Matters,” a column that will show how much measurement matters in achieving and maintaining quality, especially in manufacturing. I will cover topics such as types of...
Fred Mason's picture
Fred Mason
The local environment can be an important factor in the quality of measurements. No matter what is being measured, the higher the resolution of the measurement (the finer the detail), the...
Fred Mason's picture
Fred Mason
This is the first “Measurement Matters,” a column that will show how much measurement matters in achieving and maintaining quality, especially in manufacturing. I will cover topics such as types of...