These Odd Little Echinoderms Were Formerly Considered a Class of Their

question 46

Short Answer

These odd little echinoderms were formerly considered a class of their own.They possess tube feet distributed around the periphery of their disclike body and belong to the group ___________.

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Definitions:

Circular Runout

A tolerance that limits the total variation a surface can have when rotated around a central axis, ensuring roundness and smooth operation of rotating parts.

Total Runout

A composite tolerance applied to a feature which controls both its form and its orientation to a datum axis.

Datum Axis

An imaginary line or surface referenced in manufacturing or inspection of parts and assemblies to ensure coordination and correctness of dimension and tolerance specifications.

Circular Runout

A tolerance that controls the uniformity of a feature's surface as it is rotated about a datum axis.