I seek a word (verb, noun, adverb or adjective) that is suggestive of a particular type of constrained mechanical motion described below by way of example.
It could be a flat planar sheet moving within the imaginary plane that contains it, or it could be a curved sheet moving in a circular motion within an imaginary cylindrical surface. The defining characteristic is that the object in motion does not venture into territory outside a given surface, which contains the object itself in all its potential positions. It is like a small surface moving within another larger surface to which it conforms at all times.
The verb "slice" comes to mind, but nothing is actually being sliced here, and ideally I hope to find a word in a register that is more appropriate for a technical document, like the register of words such as "articulated" or "reciprocating" (as they apply to constrained motion). That said, I'm short on ideas so any related words could be helpful.