Isostatic positionning of a piece in a vice, the reference surface being against the bottom:
<ul><li>0 : fixed part of the vice;</li>
<li>1 : mobile part of the vice;</li>
<li>2 : piece to be machined;</li>
<li>3 : face to be machined;</li>
<li>4 : reference surface;</li>
<li>5 : blocks.</li></ul>
<a href="//commons.wikimedia.org/wiki/User:Cdang" title="User:Cdang">Cdang</a>
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