Radial Drill

The radial drill is a hole machining device that can be used for drilling, enlarging, reaming, tapping and shaving end faces.

Radial Drill

According to the classification of machine tool clamping structure, the radial drill can be divided into hydraulic radial drilling machine and mechanical radial drilling machine.

Among all kinds of drilling machines, the radial drilling machine is easy and flexible to operate, has a wide range of applications, and is typical. It is especially suitable for single-piece or mass production of holes with large porous parts. It is a common machine tool in general machining shops.


A radial drilling machine, also known as a cross arm drill.

The headstock can be moved left and right on the rocker arm and rotated by ±180° with the rocker arm.

The rocker arm can also be raised and lowered along the outer column to accommodate workpieces of different heights.

Smaller workpieces can be mounted on the workbench and larger workpieces can be placed directly on the machine base or on the floor.

Radial drilling machines are widely used in single and small batch production to process the holes of larger and heavier workpieces.

Radial drilling machines are available in a wide range of screw holes, threaded bottom holes and oil holes for drilling large workpieces.

The main variants of the radial drilling machine are the sliding seat type and the universal type.

The sliding type radial drilling machine is formed by changing the base of the basic rocker drilling machine into a sliding seat, and the sliding seat can be moved along the bed rail to expand the processing range, and is suitable for boilers, bridges, rolling stock and shipbuilding, and machining industries.

In addition to the vertical and rotary motion, the rocker arm of the universal radial drilling machine can be moved horizontally. The spindle head can be tilted on the rocker arm to adapt to the machining of various parts of the workpiece.

In addition, there are turning, wall and digital control rocker drilling machines.

The main structure

The radial drilling machine is mainly composed of a base, an inner column, an outer column, a rocker arm, a headstock and a workbench.

The inner column is fixed at one end of the base, and an outer column is sleeved on the outer side thereof, and the outer column can be rotated 360 degrees around the inner column.

One end of the rocker arm is a sleeve, which is placed on the outer column to move up and down.

Since the screw rod is integrated with the outer column and the lifting nut is fixed on the rocker arm, the rocker arm cannot rotate around the outer column, and can only rotate around the inner column together with the outer column.

The headstock is a composite component consisting of the main drive motor, the spindle and spindle drive, the feed and shift mechanism, and the operating mechanism of the machine.

The headstock is mounted on the horizontal rail of the rocker arm and can be operated by the handwheel to move along the rocker arm on the horizontal rail.

Movement form

When machining, the headstock is fastened to the rocker rail by a special clamping device, and the outer column is fastened to the inner column, the rocker arm is fastened to the outer column, and then drilled.

During the drilling process, the drill bit performs the longitudinal feed while performing the rotary cutting, and the movement form is as follows:

(1) The main motion of the radial drilling machine is the rotary motion of the main shaft

(2) The feed motion is the longitudinal feed of the spindle

(3) Auxiliary movement: the rocker arm moves vertically along the outer column, the headstock moves along the length of the rocker arm, and the rocker arm rotates around the inner column together with the outer column.

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