Whats the Big Deal?
“Work” is the stock you have and part you are creating. Workholding is a , or how you physically attach your work to the mill, is the most critical part of the machining process. If your part is not held properly, it can cause damage to both the part and the tool/machine. This can be due to intense vibrations or the part flying out of the vise. If the part is not held well, it can also blow tolerances, i.e. not being held parallel
To create well toleranced parts, and create them safely, you need to hold your work in a manner that is rigid and well referenced.
This will be gone over more in depth in the operating a mill page.
Vises
There are many types of workholding for mills, most of which can be traced back to a vise of some sort. Vises are clamped down to the table in some way, and are used themselves to clamp parts. On a mill, vises usually have removable handles to make sure they don't get hit by the machine or vibrate off.
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They sometimes used in conjunction with parallels. {See https://nerdocs.atlassian.net/wiki/spaces/NER/pages/166002984/Mill+Workholding#Parallels}
Parallels
Parallels are pairs of ground metal used to elevate the work in a vice, typically used with standard vice jaws.
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Mitee Bites
Mitee bites are an incredibly powerful tool. They allow you to grab onto very thin sections (<0.1” of material).
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The ones that can be used for round parts must be used thoughtfully. They do not hold parts concentric or parallel to the face of the jaws. It is best to use them for earlier operations, and then not used when the part it flipped over. If machining an outer circle, the outer edges will not line up nicely. If machining a top face, it will not be parallel to the bottom face.
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V-blocks sit inside the vise and get clamped along with the work. They are ground and can hold parts very concentric. There are a few different sizes of v-blocks depending on part size. You always want to make sure the part is sitting on the flats of the v-blocks, and not so large that they only touch the outer edges. Only one v-block is needed, as long as the third point of contact is another well-defined surface.
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Accessories
Parallels
Parallels are pairs of ground metal used to elevate the work in a vise.
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