Radial drilling machine is a kind of vertical drilling machine,It is suitable for single piece with a porous medium and large in batch production parts,it is mainly used for drilling, reaming, boring and tapping screw, etc.It is the common machine tool general mechanical processing workshops.
（一） The main structure and movement form.
1、The meaning of type Z3050 radial drilling machine model as follows:
Z— drilling machine
3— Rocker arm
0－Radial drilling machine type
50—The biggest hole diameter of 50 mm
2、 Main structure.
Z3050 radial drilling machine structure as shown.It is mainly composed of base, inside outside columns, column, rocker arm, main boxes, workbench, etc.In the column on the base, outside it is protected by the hollow column, within and outside the rocker arm of the columns can be along the column rotating 360 degrees.
3、 Movement form.
The main movement – the main shaft to drive the drill bit rotation.
Feed movement – spindle vertical movement.
Auxiliary movement – rocker move up and down along the outside of the post; Along the radial horizontal displacement of the spindle box; Rocker arm with outer columns relative to within the rotary motion of the post.
（二）Electrical control circuit analysis.
１、 The main circuit.
Three-phase power supply by the three-phase power supply switch QS1, introducing the fuse FU1 over all circuit short circuit protection.M1 is cooling pump motor, controlled by the transfer switch QS2 directly.M2 is spindle motor, controlled by KM1.M3 and M4 are rocker arm lifting motor and hydraulic pump motor, and respectively by KM2 and KM3, KM4 and KM5 control and reversing.M2 and M4 are respected by thermal relay FR1, FR2 overload protection.M3 is short work, M1 is due to the capacity is small, so they have no overload protection.
２、 Control circuit.
The TC system of transformer will power to 110 v, 380 v, as the working voltage control circuit.FU4 as control circuit short circuit protection, cooling pump motor, spindle motor control is simpler, analysis by the students themselves.The following focuses on the rise and fall of rocker arm and spindle box and loose and tight control of the post.It is with hydraulic device, automatically by electric motors.