An investigation of tool rigidity and workpiece mounting on the overall vibration level and product accuracy in turning processes

workpiece mounting method on the overall vibration level ofmachine-fixture-tool-workpiece system and the productsurface finish (out-of-straightness, out-of-roundness andsurface roughness) in finishing turning processes. Theoverall vibration level has been measured on the cuttingtool as close as possible to the tool-holder and in thedirection of the tangential cutting force . Three differentmethods of workpiece mounting (three jaw-chuck-tailstockmethod, two-centers method and three jaw-chuck method) indry longitudnal cut of a low carbon steel (0.25% C)workpiece, using HSS cutting tools, have been investigated .The effect of workpiece stiffness on the product accuracy(size deviation, out-of-roundness and surface roughness)have been investigated . Different stiffnesses are obtainedfor workpiece by changing the workpiece length with respectto its diameter . The workpiece was mounted by three jaw-chuck- tailstock method .The results show that increasing the tool cross-sectionand/or decreasing the tool overhanging length decrease theoverall vibration level and hence improve the surface