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Title: Topology-free Generation of Gouge-free and Minimized Undercut Tool Path from “Ball Drop” Based Cutter Location Data
Authors: Singh, Mukhmeet
Supervisor: Jawanda, Ajayinder Singh
Keywords: Tool path;Ball drop;STL;5 point interpolation;Sculptured Surface;CNC;NURBS;Spline Surface;wood working;wood carving;ball end cutter;finishing path
Issue Date: 27-Sep-2016
Abstract: One methods used for tool path (TP) planning for CNC machining of a sculptured surface is done using cutter location (CL) from the “Ball drop” method, for STL format of CAD geometry, proposed by Manos et al. “Single Controlled Axis Lathe Mill”, IJAMT 2007. Ball drop method is a fast and robust method to get gouge free cutter location points, as it does not need the topology of the model and its connectivity. This method gives us a gouge-free CL point by finding the position of a ball, representing the end of a ball end cutter, where it will rest on the triangulated STL part surface, when dropped along the tool axis. If these CL points are connected in sequence of the footprint of the path to be followed by the tool tip then the tool path generated using this method would not be gouge-free. This is because the connecting path between CL points is not checked for gouging with the STL part surface. Thus, the final machined geometry would have overcut material and undercut material due to forward and side step of the tool path, scallops and concave fillet due to spherical tool tip radius. In this thesis work a method, known as ‘TP from CL interpolation’, is developed and validated by simulation and experimentally to generate a gouge-free tool path using cutter location data based on ‘Ball Drop Method’. The advantages of ‘Ball Drop Method’ i.e. its speed and robustness are used to obtain the initial CL data. The implementation of this work is done on ‘PBG (KW) Inc. Milling Lathe CNC’ using ball nose end mill tool.
Description: Master of Engineering in CAD/CAM, Mechanical Engineering Department
Appears in Collections:Masters Theses@MED

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