Browse Prior Art Database

Air Gages

IP.com Disclosure Number: IPCOM000091976D
Original Publication Date: 1968-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Norton, JL: AUTHOR [+2]

Abstract

These generally similar air gage devices are adapted to gage miniature mechanical parts that are otherwise difficult to accurately gage. The devices directly relate back pressure, caused by occluding an air flow path, to a predetermined dimension of the part being gaged. In A, calibration sleeve 10 is used initially to support and align master plug gages, not shown, for calibrating air stand 12 and gage member 14. After being calibrated, a regulated flow of air is directed over line 16 into member 14. To measure the outside diameter of part 18, the part is inserted into opening 20 of member 14. The resultant back pressure within line 16 is registered on the pressure sensitive indicator 22 in air stand 12. This noncontact gaging has several advantages, including the ability to gage fragile parts.

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Air Gages

These generally similar air gage devices are adapted to gage miniature mechanical parts that are otherwise difficult to accurately gage. The devices directly relate back pressure, caused by occluding an air flow path, to a predetermined dimension of the part being gaged. In A, calibration sleeve 10 is used initially to support and align master plug gages, not shown, for calibrating air stand 12 and gage member 14. After being calibrated, a regulated flow of air is directed over line 16 into member 14. To measure the outside diameter of part 18, the part is inserted into opening 20 of member 14. The resultant back pressure within line 16 is registered on the pressure sensitive indicator 22 in air stand 12. This noncontact gaging has several advantages, including the ability to gage fragile parts. Also, the diameter of opening 20 has no critical tolerances or relationships and there are no required nozzle drop dimensions and nozzle balance procedures as with conventional air gages.

In B, the part to be measured is 26. This part is placed in rubber grommet 28 in gage member 30, causing air to flow from passageway 32 through part 26. The inside diameter of part 26 is measured by inserting precalibrated solid probe 34 into bore 27 of part 26. By this action, back pressure having a direct relationship to the size of the bore 27 can be read on a pressure sensitive indicator. This gage has the above-mentioned advantages. Also, probe 34 does not require encumber...