DIY CNC Controller 3 Axis Assembly Instructions

For assembly instructions for the 4 Axis kit, please see: DIY CNC Controller 4 Axis Assembly Instructions.

Thank you for purchasing our DIY CNC controller board. In these instructions you will find the information needed to assemble your DIY CNC controller board, as well as how to configure an already assembled board.

PLEASE NOTE: If you are not comfortable with soldering electronics, working with high DC and AC voltage, please do not use this controller. This controller is capable of driving dangerous machinery, and if not used properly could cause injury or even death. We are not responsible for any injuries or accidents that may occur when using these electronics or any CNC machine. If you do not agree with these terms please discontinue the use of these parts immediately.

Specifications

• Accepts 5, 6 or 8 wire unipolar stepper motors (4 wire type not compatible)
• 40 volt DC maximum input voltage, 24 volt DC recommended, 12 volt DC minimum.
• 3.0 amps maximum current per phase, 0.5 amp minimum. (Fully adjustable)
• 12 volt DC output for computer style case fan (not included).
• 1/1, 1/2, 1/4, 1/8, & 1/16 microstepping.
• Patent pending circuit protection built in to protect against short circuits.
• Inputs for limit switches and e-stop.
• Easy to build and easy to use terminal blocks for connecting wires.

Recommended Assembly Tools

To ensure proper assembly, there are several items that are necessary and recommended to complete the process efficiently.

• Soldering iron
• Rosin core solder
• Small flat blade screwdriver
• Wire clippers
• Multimeter or voltmeter
• Power supply for testing

Parts List

These are the parts that are included with your kit. Please verify that all parts are present and accounted for before beginning. Each part will also be identified using a short code, which will match up with the spots on the printed circuit board (PCB).

IC1, IC2, IC3: SLA7078MPR Stepper Motor Control Chip
IC4, IC5: LM317HV Voltage Regulator
X1: 26 Pin IDC Male Header
TB1, TB2, TB3, TB4: 6 Position Terminal Block
TB5, TB6: 2 Position Terminal Block
C1, C2, C3, C4, C5, C6, C7, C11: 0.1µF Capacitor (Has code 104 on it)
C8, C9, C10: 680µF 50V Electrolytic Capacitor
R1, R2, R3: 10K Resistor (Color code: Brown, Black, Orange, Gold)
R5, R7: 240 Ohm Resistor (Color code: Red, Yellow, Brown, Gold)
R4: 715 Ohm Resistor (Color code: Violet, Brown, Green, Black, Brown)
R6: 2.05K Ohm Resistor (Color code: Red, Black, Green, Brown, Brown)
VR1, VR2, VR3: 1K Variable Resistor Potentiometer
SW1,SW2, SW3: 3 Dip Switch
RN1, RN2, RN3, RN4: 10K Resistor Network

Board Layout