Automatic controlling the form and position tolerances of cylindrical parts and the system design

Dimensional properties of all parts used in the various industries such as lengths,angles, etc. are determined with standard measurements and control tools. Dimensionalproperties can also be found with fundamental theories whose geometrical propertiesare known.Essential principle in dimensional measurements is to control whether productionsfell in to the designed limits or not. Therefore, increasing serial productions, decreasingproduction costs and improving the quality in all branches of industry can merely beachieved with systematic measurements and quality controls.Geometrical defects are inevitable as dimensional defects. Having probed theexistent defects and tested the parts, if the defects are in the predetermined limits it isbelieved that the parts work well. Geometrical defects can also be found by usingdifferent methods and devices with determining the shape and position tolerances of apart.In this study, determination of geometrical properties of a cylindrical part withknown dimensions and tolerances, and investigation of these properties that whether ornot they fall into required limits, are aimed. For this purpose, an XY table was designedand produced, and also a step motor was used to mobilise the table. In order to obtainrequired data from test samples prepared, an LVDT (Linear Variable DifferentialTransducer) was attached to the XY table and data was transferred to the personnelcomputer. To be able to gain and store the data during the test an algorithm has beendeveloped and coded using MATLAB and GeniDAQ.As a conclusion, according to data and graphs there are geometrical defects andgreater than expected tolerances found from the samples after production stage.KEYWORDS: Form tolerance, position tolerance, XY table.ii