Abstract: A gas-curtain protection device for an aerospace precision machining spindle includes a spindle body, a shaft, a first labyrinth ring, a gas guide ring and a bulkhead ring. The first labyrinth ring and the gas guide ring are mounted around the front end of the spindle body, and the bulkhead ring is mounted around the shaft. The first labyrinth ring has a gas pipe, and the gas guide ring has a gas tank communicated with the gas pipe. The bulkhead ring has a gas guide structure communicated with the gas tank. In use, gas is delivered from the spindle body to the gas tank through the gas pipe, and then guided to the exterior of the spindle body by the gas guide structure so as to form a gas curtain that effectively prevents cutting fluid and chips from entering the interior of the spindle body.

Abstract: Disclosed herein is means for directly coupling a main motor shaft to a working machine with a coupling head as an intermediate component. The machine unit assembled according to the present invention does not require rechecking of dimensional deviations after completion of assembly. The present invention is applicable to both upright type and lateral type machine units.

Abstract: Disclosed herein is means for directly coupling main motor shaft to working machine with a coupling head as an intermediate component. By applying highly accurate precision machining technology. The machine unit assembled according to the present invention does not require recheck of dimensional deviation after completion of assembly. The present invention is applicable to both upright type and lateral type machine units.