Fowler’s A2LA accredited calibration laboratory is a state of the art facility with strict environmental controls and top of the line metrology equipment. The lab features highly trained staff, with skills in operating and calibrating a diverse range of measuring equipment, to meet strict performance standards. All aspects of the laboratory are tightly controlled and audited to assure that the work meets the highest possible standards.
The laboratory’s scope and capabilities are continually expanding as new equipment and procedures are added. The newest addition is the ability to certify steel rulers using an automated Fowler/Gagemaster vision system. This computer controlled system reduces any possible operator error and provides highly accurate and repeatable results.
Currently, Fowler’s accredited calibration scope includes bore gages, calipers, pins/plugs, rings, depth micrometers, gage blocks, height gages, indicators, indicator calibrators, length standards, probes (LVDTs), micrometers, thickness gages, universal measuring machines, and steel rulers. This means that when a gage is purchased from Fowler an accredited A2La certification can be requested and shipped with the tool(s). This saves Fowler customers significant time and expense. Existing gages can also be sent in for calibration to assure that our customer’s tools are functioning accurately, and to original specification.
zCAT Calibration: We use 3 artifacts to calibrate the zCat
1 . The surface plate to check flatness. We measure at tow location 0 degree and rotate zCat 180.
2. Two set of rings gage, 2 different size rings gages at different locations around the zCat using both vertical and horizontal probe
3. Our calibrated fixture ball with 52 precision balls. As you know good accuracy start with good repeatability, our fixture fits entire zCat volume so it’s a global calibration we don’t just check for one axis.
Each sphere is measured with 19 hits with vertical and horizontal probe, with 52 balls measured with obtain 52 ball bar length each length different size, different position different orientation, other short other goes over 600mm. the shortest ball bar in this combination is 61mm the longest one is 655mm total of 1326 ball bar per one rotation.
After measuring 52 balls we rotate the fixture 60 degree and remeasure 52 balls total of 6 positions every 60 degree we will have 312 ball measurements and 7956 ball bar. By taking the 7956-different ball bar length and reducing their deviation to zero we get repeatability and accuracy for our zCat.
Fowler High Precision
66 Rowe Street
Newton, Massachusetts 02466