Error Aggregationin the Reengineering Process from 3D Scanningto Printing

This work aims to study the aggregation of dimensional errors in the reengineering processes using 3D scanning and printingwithout initial design drawings. A 57-tooth spur gear is used as an example to facilitate the discussion. Two approaches areinvestigated. The first one builds the gear model based upon measurement taken from a caliper, and the second approach usesa 3D scanner to collect geometry data. Dimensional errors in each stage of these two approaches are investigated. Particularattention is paid to the geometry data flow in the reengineering process from data acquisition and editing to model construction.Recommendations are made in regard to error estimation and alleviation.