Anatomy of an Endmill
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Length of Cut - The length the endmill is able to cut. This is not equivalent to flute length.
Neck - This is the portion of the endmill that can rub on the material as the flutes cut during a deep cutting operation. It includes both the top portions of the flutes not suitable for cutting. A necked endmill has a portion of the length above the flutes at a smaller diameter to give it a deeper reach. Necked endmills aren’t the typical style, but they are an option if required.
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Facemills are a desirable option for facing. They result in very smooth finishes and take away a lot of material in stepover while not taking away very much in stepdown. They usually have a few cutting inserts that can be flipped or replaced when one gets damaged or worn down.
Specialty Mill Tools
TBD
Toolholding
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Keyseat Cutters
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Keyseat tools are used to undercut some material, where you want to create some sort of internal groove that a typical endmill could not. These are usually purchased on an application specific basis, as the cutter diameter ratio to the neck and the cutter length will likely need to be pretty specific. These are usually used to cut grooves for retaining rings.
Toolholding
ER-## Collets
These types of collets are the standard for toolholding in the MIE Capstone Shop. ER collets have slits on both their front and backside, which allows for a wider grip range than their 5C counterparts [see Collet Blocks in Mill Workholding].
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