Error motion of a kinematic spindle

King Fu Hii, R. Ryan Vallance, Robert D. Grejda, Eric R. Marsh

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A prototype spindle for low-force, low-speed applications that is kinematically constrained in accordance with the principles of exact constraint was designed, fabricated, and tested. In the prototype spindle, the position and orientation of the shaft (rotor) are constrained at five contact points; four constraints are arranged radially around the rotor, and one constraint is located at the end of the rotor. This paper describes the design of the prototype spindle and presents a study of its error motion for the hardened steel rotor sliding on brass and UHMW-PE bonded to ceramic. The error motion is observed to be highly repeatable with less than 100nm asynchronous errors, and a simple analytical model enables the prediction of the synchronous error motion using measurements of the rotor's roundness profiles.

Original languageEnglish (US)
Pages (from-to)204-217
Number of pages14
JournalPrecision Engineering
Issue number2
StatePublished - Apr 2004

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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