3d objects on cnc are machined using a ball-ended bit.
Similar to a topographical map, tool paths are mapped over the undulating surface of the 3d object. The finishing quality is achieved by placing these tool paths as close to each other as to create 90 percent overlap of the tool, which means it takes a long time.
Whenever profiling bits can be used, they are great because they are fast and require minimal sanding. The profile of something like a guitar neck is not consistent the way a profile bit is, unfortunately, leaving no choice but to go for 3d machining.
I hope this helps?
I use cnc to produce artwork and architectural elements - this is why I am learning MOI.
Cheers!
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