A comprehensive model for the measurement, inspection, performance prediction and reverse engineering ofZKtype of
worm gearing is developed. The measurements and the best ft processes both for the worm thread and for the gear tooth
flank are discussed in detail. A CMM measurement strategy free of tip compensation which applies to many types of
tools and parts in the gear industry is proposed. A real case of ZK type of worm gearing with the parabolic profile
modification on the hob is studied to ilustrate the reverse engineering process.