“Work” is the stock you have and part you are creating. Workholding is a 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.
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The ones that can be used for round parts must be used thoughtfully. They do not hold parts concentric. 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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If you are trying to hold a part parallel or concentric, do not use Mitee Bites. They should only be used for grabbing onto small stock for initial passes. |
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Soft Jaws
Soft jaws are jaws that are usually made yourself out of plastic or aluminum. They are shaped to match interesting contours on a part that are not easily held by workholding methods in the shop or easily sourceable.
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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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