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Shelling vs Scaling for electrodes


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Does anyone here have any experience with Shelling vs Scaling electrodes for EDM sinker? My understanding is that Scale will shrink (or grow) the entire model to whatever proportion you indicate. Shell, on the other hand, offsets the surface some amount. This has the side effect of "wiping out" certain features that are below a certain threshold. For instance, if you have a boss that is .010" in diameter, and you shell the model by .005", this boss will be lost since there is no way to offset the surface that amount and keep the feature.

 

If this is the case, Scale will always preserve features, even if you don't have tooling that can effectively machine it, while Shell will "destroy" certain features depending on the amount Shelled.

 

Is this more or less accurate? Can anyone chime in with clarification or their own experiences? My only other option is to use the nominal, unaltered model and "cheat" the machine into thinking the tooling is oversize so all the toolpaths are smaller. I tried this before and it was just a mess of, "It says '.030 BEM' on the setup page, but I'm actually supposed to put a .040 BEM in the machine."

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