12/2/2011 Update! We are now reading data from the micrometer, and calculating bin numbers for gear sorting and pump builds. We take 3 samples of a gear, and reject the gear if there is too much variation between the samples.
The Digimatic SPC protocol is a communications protocol developed by Mitutoyu, the big guns in Calipers, Micrometers, Dial Indicators, Scales and more. These devices have a data port that allows you to communicate with a microprocessor or microcontroller, for data logging and other measuring applications.
Mitutoyo 05CZA662, Digimatic Cable, 40", With Data Switch for Coolant Proof Micrometers
Code, diagrams, and specs. - http://www.green-trust.org/digimatic/
Instructable - http://www.instructables.com/id/Interfacing-a-Digital-Micrometer-to-a-Microcontrol/
Interface Boards - http://arduinotronics.blogspot.com/2012/06/arduino-to-mitutoyo-interface.html