Many times a machinist is required to machine features into a part that are located in a radial pattern instead of in a line. Examples of such features are the flats on a nut, the teeth on a gear or the splines on a shaft. The Sherline indexing attachment is a unique design that provides a very economical means of accurately rotating a part so that these kinds of features can be machined.
Here is another one of the I am not sure. A friend told me it was a 50 but it is not marked. Yes there is staining from sitting but the shank is as smooth as a baby's ass!
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