Mikes CNC Slant Bed Lathe Part 06 – Electronics
Block Wiring Schematics
CNC Lathe Electrical Schematic Panel Switches
CNC Lathe Electrical Schematic Omron Relay Box
 Photo of CNC Lathe Main Control Computer |
Main Control Computer: Dell Optiplex 755 SFF desktop computer (replaced laptops used earlier). |
 CNC Lathe Electronic Variable Speed Controller |
Variable Speed Controller for DC Spindle Drive Motor ($160.55) – www.Geminicontrols.com |
 CNC Lathe Stepper Motor Controller Board |
 CNC Lathe THB6064AH Stepper Motor Driver Chip |
Ordered 5 THB6064AH Stepper Motor Driver chips via eBay – $42.00 free shipping from central China. I smoked several of these by accidentally pinching & shorting the motor output wires during motor tuning setup. |
 CNC Lathe Control Panel Electronics Bay Rear View |
 CNC Lathe 240-120 V AC Toroidal Transformer |
| Toroidal transformer (step down 240 vac to 120 vac) & power strip are mounted below electronics bay. |
 CNC Lathe 240-120 V AC Toroidal Transformer |
 CNC Lathe Arduino Slotted Optocoupler Module |
 CNC Lathe Arduino Slotted Optocoupler Module Schematic |
Description: Arduino Slotted Optocoupler Module |
| • Groove Width: 5mm • LED output state indicators • Obscured => output high; unobstructed => output low • Module slot unobstructed, receiver conduction: DO output low. Obstructed, DO output high • The comparator output, more than 15mA • Operating Voltage: 3.3V-5V • Single centered hole for easy installation • PCB Dimensions: 3.2 x 1.4cm / 1.25” x 0.55″ • Uses wide voltage range LM393 comparator |
 CNC Lathe Z Axis Optocoupler Above |
 CNC Lathe X Axis Optocoupler Above |
Spindle Index & RPM Sensors
Single aluminium bracket holds two Optocouplers; Brown-Black leads show 30 slot wheel on the spindle, Green-Black leads show single Index tab (made from an old credit card, super-glued to the hub).
| Black Analog Out Green Digital Out Black Ground Yellow +5vBlk Analog Out Brown Digital Out Black Ground White +5v |
 CNC Lathe Index & rpm Optocoupler |
That concludes this section of the DIY CNC Slant Bed Lathe build Part 06
Future Pages
We’ve now covered 16 out of 19 topics!
Next section will be about the Coolant System