Squaring a Block on the Mill - 7: Machine a Parallel Side
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Now that you have two sides which are square to each other you can utilize either surface to create new surfaces. In the video the part is simply turned upside down and a new parallel surface is machined.

A question you might ask yourself is: "Am I machining a new a perpendicular surface from the trust of the rear vise jaw or am I machining a new parallel surface from the trust of the vise jaw slide?" The answer in this instance is "both!" or "either!" It really doesn't matter since both vise surfaces are to be trusted as square. However it would matter if only one vise surface was trusted to be aligned with the machine. It is up to the machinist to know the state of the machine and fixturing. This is a given.

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label: milling machine, square, parallel, transfer precision, clamping, bolster, perpendicular, machinist's square