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These hours are not only expensive, but also tend to be anxiety-ridden because there is a customer somewhere waiting for the delivery of his mold and he will only be getting it after hours of tedious manual polishing has been completed.So, it is no surprise that Dave King, owner of Choice Tool (Minneapolis, MN), was all ears when Brian Pascoe from Prototek Engineering (his local CAM reseller) called to inform him that these cost factors were about to change dramatically.Even though he was still in his twenties, he had 10 years of tool & die experience starting with IBM’s apprenticeship program.King knew how to operate CNC equipment, he had high-end CAM programming experience with CATIA, and the buyout he was about to receive would provide him with enough capital to finance a Fadal CNC machining center and a seat of Mastercam that he purchased from Prototek after an extensive review of all the software packages available at the time.


The specific G-codes control motion, speed, rotation, depth, and other related switches and sensors used in the operation of a machine.

Roughing costs are two-fold—the long amounts of time it generally takes to remove the material and the costs associated with replacing worn tooling.

Finishing costs include the time it takes to write complex CAM programs with the minute stepovers that the moldmaker hopes will result in mirror finishes, along with the numerous hours it takes to hand polish areas that come off the machine without complying to the user’s surface finish specifications.

The file type is “unitless” — 1 unit could be 1mm or 1″ (or any other arbitrary measure) — so it’s important to know how the file was generated.

The specific CAM technology improvements that Choice Tool received training in were Opti Rough (a 3-D full flute roughing toolpath based on Mastercam’s Dynamic Milling technology) and the unique advanced Toolpath Refinement algorithm used for making granular changes to finishing toolpaths in order to achieve exceptionally high surface finishes.

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