Documenting the Measuring Process
Statistical quality control (SQC) has been in use since the 1930s, when it was performed with paper, pencil, and maybe a slide rule. As such, it was originally somewhat time consuming, and it required a fairly high level of care and understanding on the part of its practitioners. SQC got a big boost in the 1970s and ’80s, when electronic gages, data loggers, and PCs began to proliferate. Suddenly, untrained line inspectors could easily perform the necessary calculations, without really understanding the process.
Many instructors using SQC as part of the measuring process insisted that inspectors and machine operators should learn to do SQC manually before they plug in their data loggers. This was under the general principle that people who understand what they’re doing tend to do a better job. This is a totally understandable concept – until of course, the production manager gets involved.
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Micromar® 40 EWRi-L Digital Micrometer
Mahr’s Micromar 40 EWRi-L Digital Micrometer offers integrated wireless data transmission in addition to a quick drive spindle, where one turn of the thimble is now equal to 5 mm (0.2 in) of spindle travel. Moving to different sizes on a sample part is now 10-times faster than with a standard micrometer.
Product features include:
- High contrast digit display
- Stainless spindle is hardened throughout and ground
- Spindle and anvil are carbide-tipped
- QUICK DRIVE
- Sliding spindle
- Ratchet is integrated in the thimble
- Lacquered steel frame, heat-insulated
