Assessing deflections experienced by a workpiece during computer controlled machining with a toolpath to determine stock amount

A system comprising:

• a data processing apparatus including at least one hardware processor;
• and
• a non-transitory computer-readable medium encoding instructions of a computer-aided design or manufacturing program, the instructions being configured to cause the data processing apparatus to
• obtain a finishing toolpath specification for three dimensional geometry of a three-dimensional model of a part to be machined by a computer-controlled manufacturing system from a workpiece;
• generate three dimensional geometry of a model of a semi-finished structure on which a finishing operation according to the finishing toolpath specification is to be performed, wherein the three dimensional geometry of the model of the semi-finished structure has a stock allowance determined in accordance with a computer simulation of deflections experienced by the workpiece as stock material is cut during the finishing operation from the workpiece by the computer-controlled manufacturing system using the finishing toolpath specification to form the part from the workpiece;
• create a semi-finishing toolpath specification for the three dimensional geometry of the model of the semi-finished structure;
• and
• provide the semi-finishing toolpath specification for use in machining the part by the computer-controlled manufacturing system by cutting away a first portion of the stock material using the semi-finishing toolpath specification to form the semi-finished structure from the workpiece, followed by performing the finishing operation of the semi-finished structure by cutting away a second portion of the stock material to form the part from the workpiece.

A non-transitory computer-readable medium encoding instructions operable to cause data processing apparatus to perform operations comprising:

• obtaining, in a computer-aided design or manufacturing program, a finishing toolpath specification for three dimensional geometry of a three-dimensional model of a part to be machined by a computer-controlled manufacturing system from a workpiece;
• generating three dimensional geometry of a model of a semi-finished structure on which a finishing operation according to the finishing toolpath specification is to be performed, wherein the three dimensional geometry of the model of the semi-finished structure has a stock allowance determined in accordance with a computer simulation of deflections experienced by the workpiece as stock material is cut during the finishing operation from the workpiece by the computer-controlled manufacturing system using the finishing toolpath specification to form the part from the workpiece;
• creating a semi-finishing toolpath specification for the three dimensional geometry of the model of the semi-finished structure;
• and
• providing the semi-finishing toolpath specification for use in machining the part by the computer-controlled manufacturing system by cutting away a first portion of the stock material using the semi-finishing toolpath specification to form the semi-finished structure from the workpiece, followed by performing the finishing operation of the semi-finished structure by cutting away a second portion of the stock material to form the part from the workpiece.