About the article

PCB Drilling Machine (3)

PCB construction

The controller board contains all the electronics for the plate motor and four drill arms. As a matter of course, the board population is in accordance with the actual number of drill arms you have in use.All the components of the circuit can be built onto a single-sided printed circuit board. The PCB and component layout are shown in Figure 1. The power supply (as far as the transformers) is also built onto the circuit board: it provides a +30 V supply for the solenoids and stepper motor drivers, +15 V for the drill motors, and +5 V for the logic, regulated by IC1. The layout is very straightforward: along one long edge of the board we have the stepper motor drivers, each with a pair of terminal posts (K11-K20) for connection to the stepper motor windings. Since comparatively high currents flow through the ICs, they should be soldered directly to the board without sockets.
Downloading of this magazine article is reserved for Elektor Members only.
Already a member? click here to log in.
COMPONENTS LIST
Basic version, w/o tool arm
Resistors:
R1,R2,R41,R43,R44 = 10kOhm
R11,R14 = 1kOhm
R12,R15 = 1Ohm , 1W
R13,R16 = 56kOhm
R42 = 220Ohm
R45,R46,R47 = 560Ohm
R48 = 8-way resistor array 47kOhm
R49 = 1kOhm 5
Capacitors:
C1,C2,C60,C61,C65 = 100nF, 5mm lead pitch
C3,C4,C5 = 3300ยต F 50V radial
C22,C25,C26,C29 = 100nF, 2.5mm lead pitch
C23,C27 = 820pF, 2.5mm lead pitch
C24,C28 = 820pF, 5mm lead pitch
C63,C64 = 15pF
Semiconductors:
B1,B2 = GBU6B
D12 = LED, red, 3 mm dia.
IC1 = 7805
IC2 = GAL 16R8 (programmed, order code 010024-31)
IC3,IC4 = PBL3717A
IC13 = PIC16C64-20P (programmed, order code 010024-41)
IC14 = 74HC165
Miscellaneous:
K1,K2 = 2-way PCB terminal block, lead pitch 5mm
K11,K12 = 2-way pinheader, 0.1in. lead pitch
K21 = 25-way sub-D plug, angled pins, PCB mount
F1,F2 = fuse, 2A (T) time lag with PCB mount holder and cap
BU1-BU4,BO1-BO4,JP1 = 2-way SIL pinheader
JP2 = jumper
X1 = 20MHz quartz crystal
PCB, order code 010024-1

COMPONENT LIST
(external components)
1 mains transformer for 2 drill arms: toroidal 2 x 12V 80VA
T9,T10,T11 = SFH309-F4 or LTR4206E
IR-LED: TSIP4400
Stepper motors type KH2JM2-851

COMPONENTS LIST
(for Tool Arm #1, replicate for other arms)
Resistors:
R8,R10 = 100Ohm
R17,R20 = 1kOhm
R18,R21 = 1Ohm , 1W
R19,R22 = 56kOhm
Capacitors:
C16,C20 = 100nF, 5mm lead pitch
C30,C33,C34,C37 = 100n, 2.5mm lead pitch
C17,C21 = 220nF, 5mm lead pitch
C31,C35 = 820pF, 2.5mm lead pitch
C32,C36 = 820pF, 5mm lead pitch
Semiconductors:
D6,D8 = BUV27-200
T6,T8 = BUZ11
IC5,IC6 = PBL3717A
Miscellaneous:
K8,K10 = 2-way pinheader, lead pitch 3.96mm
K13,K14 = 2-way pinheader, lead pitch 2.54mm
Loading comments...