Gaging Basics


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Gaging Methods
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Definitions
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Direct Measurement
.		 Comparative Measurement
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Continuous Dial
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Balanced Dial		 . . Sensitive Contact - The point or surface through which measuring motion is transferred to the Dial Indicator, either directly or indirectly to show part size.

Reference Contact - The fixed point or surface from which a dimension is measured or compared.
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Direct Measurement Gage is adjusted so indicator reads zero with contact touching the reference point or surface. Gage shows actual size of part. Indicator dial is usually continuous.
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Comparative Measurement Gage is adjusted so indicator reads zero with a master or nominal size part in gaging position. Gage shows plus or minus deviation from nominal for each part checked. Indicator dial is usually balanced.
. . Anvil - A flat end referenced contact

Platen – A flat wide reference surface, sometimes referred to as a “table”.

Working Surface – The top surface of a gage or comparator base. Usually serves as a reference table.

 

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