1. A machine tool comprising a base, hollow supporting column extending upwardly from said base, a hollow, T-shaped spindle carrier housing mounted on said column, the stem of the T forming a gear box casing and the crossbar of the T forming a spindle casing, a spindle journaled in said spindle casing, a gear box having drive means contained in said gear box casing for operating said spindle, and a drive motor in said column drivingly connected to said drive means for transmitting torque thereto and thence to the spindle, a flat end face on the column provided by flanges defining an opening for receiving the gear box casing, and a flat face on said spindle casing surrounding said gear box casing and arranged to cooperate with the flat end face on the column to thereby indirectly support the gear box casing from said flanges through the intermediary of the spindle casing.