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<p>[QUOTE=&quot;springfld.arsenal, post: 269449, member: 54&quot;]Precision surface plates are classed as &quot;inspection&quot; instruments.&nbsp; In most cases they&#039;re used in conjunction with precision height gauges for checking dimensions of finished parts, or sometimes in-process parts with critical dimensions.&nbsp; There are other flat stone plates used in the machining area for working measurements but those are usually smaller pieces of black granite.</p><p><br /></p><p>Btw here&#039;s a pic of the stone on edge on the raised tipper after we measured and marked it.&nbsp; The tags on the side of the stone have info on its maker and its original accuracy certification.</p><p><br /></p><p><img src="https://springfieldarsenal.files.wordpress.com/2017/08/img_5786.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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