Browse Prior Art Database

Gap Measurement Device

IP.com Disclosure Number: IPCOM000091366D
Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Mahurin, BT: AUTHOR [+2]

Abstract

This device enables the measuring of gaps between parallel surfaces of the order of 50 microinches where standard gauges cannot be manipulated, for example, a gap between a punch and the mating die.

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Gap Measurement Device

This device enables the measuring of gaps between parallel surfaces of the order of 50 microinches where standard gauges cannot be manipulated, for example, a gap between a punch and the mating die.

The flow of air or gas through a line as permitted by the gap to be measured is used to determine the size of the gap. Air under pressure is applied at inlet 12 leading to regulator 14, filter 16 and gauge 18. From the latter, the air is passed through tube 22 of capillary dimensions to flow about thermistor 24 and then through flexible tubing 26 to probe 28. The air exhausts through a small rectangular throat in probe 28 and gap G to be measured. Probe 28 is machined for 90 degrees corners. A resilient external surface material can be added to probe 28 to accommodate corners which are not exactly square.

The flow of air is proportional to gap G. The impedance of thermistor 24 varies with temperature which changes with the flow of air. The impedance of thermistor 24 is reflected in the unbalance of a Wheatstone bridge circuit. Meter 30 is calibrated to indicate gap width directly. Zero adjusting resistor 32 is used to balance the bridge for zero gap width.

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