Housing

This part, while not presenting significant technical challenges, did present some dimensional challenges.

    The customer needed two counterbores at either end of the part to be held within .0003 concentricity.  They also called for the bore diameters to be within .0002".  To machine the trepan groove first we needed to make our own tools.  Then we roughed and finished the groove and the OD profiles.  We also finished the thread and milled the slots in the OD.  We then turned the part around and finished the back side of the part roughing the counterbore on the back side.   Now came the dimensional challenge.  Normally the NC machines have a minimum increment of .0001.  We knew this would not give us the degree of control we needed to hold the tolerance.  So we changed the machine from the inch system to the metric system.  This reduced the minimum increment sufficiently to allow us to hold the .0002 dimension.