Position Deviation of a Holes Pattern Due to Six-Point Locating Principle

摘要

This work shows a statistical method to predict the position of the locators around a plate to minimise the deviation of drilled holes pattern from their nominal position due to the inaccuracies on locators position. The statistical method adopts 3-2-1 locating principle and models the position of each locator by a Gaussian probability density function and, consequently, calculates the probability the drilled holes pattern falls inside the location tolerance, that is centred around each hole's nominal position. Starting from this statistical method, we introduce a very simple rule in locator configuration that gives quite interesting suboptimal solutions.