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Dial indicator test accurately measures dimensional changes.

The dial indicator's measurement method, which can be used in any metalcasting facility, has been in use for many years to test dimensional change in cores.

The method measures the linear shrinkage of a 1 x 1 x 8 in. (25 x 25 x 200 mm) core using a dial indicator. A core is produced and immediately placed into a fixture with a spring-loaded dial indicator. The indicator is zeroed, and as the core shrinks, negative values are recorded overtime.

Researchers have tested this method and been able to produce repeatable results. A recent study confirmed the test method is capable of detecting core dimensional changes over time with coremaking process and measurement method errors only contributing a small portion of the total changes.

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Publication:Modern Casting
Date:Oct 1, 2011
Words:126
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