Re: [CAD_CAM_EDM_DRO] Machinery bone-yards? Need Millport parts

Jon,

From your description of the spindle being locked up when you
engage the side backgear lever, it sounds to me like the pulley
is not disengaging from the backgear when the top lever is moved
to the nonbackgear position. The ring/cam on top of the housing
has two small shoulder screws in the cam slots which are supposed
to lift the pulley when the top lever is rotated. These small screws loosen
and wear until they don't do their job. My guess is the terrible noise is
the backgear train is being "back driven" at a high rate of speed.
Take a look at those screws, then look at your Bridgeport head and
compare the movement.

Bob