Statistical process control is an excellent quality assurance tool to improve the quality of manufacture and ultimately scores on end-customer satisfaction. SPC uses process monitoring charts to record the key quality characteristics (KQCs) of the component in manufacture. This paper elaborates on one such KQC of the manufacturing of a connecting rod of an internal combustion engine. Here th...

Geometric dimensioning and tolerancing (GD&T) is a method to specify the dimensions and form of a part so that it will meet its design intent. GD&T is difficult to master for two main reasons. First, it is based on complex 3D geometric entities and relationships. Second, the geometry is associated with a large, diverse knowledge base of dimensional metrology with many interconnections. This pap...

a r t i c l e i n f o Keywords: Dimensional metrology Interoperability Standard development STEP DMIS Dimensional metrology is an important part of any manufacturing system. It consists of distinct components and requires a large, diverse, and interconnected knowledge base. How to pass information seamlessly with minimal cost and minimal data loss between different components of a dimensional m...

Rigorous and precise formulation of tolerancing and dimensioning plays an important role in tolerance evaluation using CMMs. In this paper, we rst present a uniied geometric formulation of form tolerances using an extended least-squares E-LSQ approach. Then, using properties of connguration space of symmetric features an iterative algorithm is developed to solve the E-LSQ problem. Simulation re...

Coordinate metrology aims to answer two questions: whether a manufactured part meets design tolerance specifications and how well the manufactured part meets the specifications. Existing methods for analyzing measured coordinate data are not adequate or effective for parts of complex tolerance zones. This paper presents a new approach to dimensional qualification of manufactured parts. In this ...

Tolerance design is the process of deriving a description of geometric tolerance speci cations for a product from a given set of desired properties of the product. Existing approaches to tolerance analysis and synthesis entail detailed knowledge of geometry of assemblies and are mostly applicable during advanced stages of design, leading to a less than optimal design. During the design process ...