It's a good idea to regularly tram the mill head with an indicator to make sure it's maintaining a proper alignment with the table. It's more convenient if this operation can be accomplished with the milling vise installed. Having two preset positions and utilizing a Starrett 196, this indicator holder can sweep the mill table with the vise installed to check head tilt and can also sweep a circle in the center of the mill table to check head nod as well.
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