By Oskar Karl Gustav Tietjens

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6) Quality acceptation level. 7) Outgoing quality control and its limitations. Decisions must be taken in light of the Pareto graph. The malfunction repartition diagram is useful in this respect. 1. ). 5. 5. 2. Malfunction spread over 16 so-called “nevralgic” points – ZA → Here is where most failures occurred. Decision: We have three very fragile points in the machine: 20% account for 80% of the interventions resulting in high maintenance costs because of the changes in machine elements to be performed.

Who does it? – What? Who does what? – Where? Does it where? – When? Does it when? – What? What to do? – How? How does it? – Why? For what reason is it done? Questions are asked in audits. For example, for an audit to certify that the ISO 9001 (9002) norm is being met, we can ask about 11 main questions and 11 secondary questions in addition to the analysis of the quality manual. Some sample questions to ask yourself and others are: 1) Is there a procedure concerning the management of the measurement tools used?

1. Quality control flowchart in mechanical engineering Nature of the problems faced by the quality function Globally Vague formulation of data Chronic lack of quality Locally Numbered data formulation Insufficient capability Poorly managed stocks Too few quality initiatives Implementation of an SPC process Rate of rejection or recovery Disorganized delays (ignored simo charts), etc. Identification of the true non-quality factors, etc. 1. 2. Classical tolerancing and quality control If the statistical approaches were used, classical tolerancing (∅ ± TI) would become penalizing.

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Applied Hydro - and Aeromechanics. Based on Lectures by L Prandtl. (Transl. by Jacob Pieter Den Hartog.) by Oskar Karl Gustav Tietjens

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