However, Roe (1916) credits James Nasmyth with the invention of the shaper in 1836. Samuel Bentham developed a shaper between 17. Starting from a drilled or cored hole, a shaper with a boring-bar type tool can cut internal features that don't lend themselves to milling or boring (such as irregularly shaped holes with tight corners). It is even possible to obviate wire EDM work in some cases.Cam drums with toolpaths of the type that in CNC milling terms would require 4- or 5-axis contouring or turn-mill cylindrical interpolation.
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