Taking the machining diesel engine cylinder nozzle hole as example, the course of working fixture body used in machining space double inclined hole is analyzed and the design formulas of dimensional tolerance are deduced.

In order to content the need for drilling slant holes of different angles, the suspend-arm type tower is designed according to the machinery characteristics of XY series drilling machine.

Curtain grouting design for Zhongguan iron mine demands big depth and high verticality,but under the complex geological and hydrological conditions,borehole deviation is serious.

Also it is difficult to control hole deviation.

This paper introduces the examination of compound pile foundation,the principle of grouting reinforcement and the construction technology,and elaborates the common problems of the drill hole deviation s prevention in the process of drilling holes and taking cores.

Based on the analysis of the processing technic and configuration feature of angle hole of piston rod, the author gives a design of drilling jig.