Correlation of CMM Data with Flexible Fixturing 2001-01-3066
To correlate data collected at multiple sites when using flexible fixturing to position parts for a CMM (Coordinate Measurement Machine), there are additional factors to consider and coordinate than when using CMM Holding Fixtures.
When measuring sheet metal with hard gages or using CMM holding fixtures at multiple sites, the following factors must be considered:
Datums must be coordinated
Part orientation must be common with respect to gravity
Clamp sequence must be the same
Measurement points and approach angles must be identical
When measuring sheet metal with flexible fixturing, such as a DEA System 5 (Manufactured by DEA Brown & Sharpe), at multiple sites, additional factors come into play:
The locations of the programmable sheet metal supports (commonly called bowling pins) must be alike and positioned at, or as close as possible to, the same datums
Clamping devices generally are not necessary
The alignment points must be alike
The quantity of iterations and acceptance criteria used for best fit must be the same
Alignment points must be output in the measurement report
This paper will describe and demonstrate the importance of all of these factors and focus on the ones, which are unique to flexible fixturing systems, such as the DEA System 5.