Patent ID: 8648600

Claim:
A method for testing slow roll on a partially machined electrodynamic machine shaft, comprising the steps of: performing a first set of minimal machining operations on a shaft that are necessary for: coupling and rotating the shaft in a slow roll test apparatus, and performing a slow roll measurement on the shaft at a designated testing location prior to completing all shaft machining operations; coupling the shaft to a slow roll test apparatus; measuring shaft mechanical runout at the designated testing location and thereafter: designating the shaft suitable for performing further slow roll electrical runout testing when the slow roll mechanical runout measurement is below a specified mechanical runout threshold, or selectively remediating the shaft only at that location by re-machining as necessary to conform the shaft mechanical runout to below the specified mechanical runout threshold, or scrapping the shaft without undertaking further machining operations if the remediation operations do not conform shaft mechanical runout to below the specified mechanical runout threshold; measuring slow roll electrical runout at the designated testing location with a proximity measuring system, and thereafter: designating the shaft suitable for performing a second set of machining operations intended to complete shaft manufacture, with any desired machining tools, when the slow roll electrical runout measurement is below a specified electrical runout threshold, or selectively remediating the shaft only at that location by treating the shaft blank at the designated testing location as necessary to conform the electrical runout to below a the specified electrical runout threshold; or scrapping the shaft without undertaking further machining operations if the electrical runout remediation operations do not conform shaft electrical runout to below the specified electrical runout threshold; and preparing the shaft for performance of the second set of machining operations if so designated during prior testing steps.