Michigan catalogue of two-dimensional spectral types for the HD stars

An improved machining center including an automatic tool changer adapted for boring, drilling, milling, tapping and tool changing operations under numerical control. The machine, which may be built in both horizontal spindle and vertical spindle configurations, includes a tool storage matrix and tool transport shuttle compactly arranged on the upstanding column and a two-handed transfer arm on the headstock. The toolholders are carried in tool cups having mechanical latches. The matrix and the shuttle are also provided with mechanical latches for the tool cups actuated as an incident to transfer of tools between the matrix, shuttle, and arm or vice versa. The machine is adapted to operate with toolholders interchangable with those for a current commercial vertical spindle machining center.