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Arduino nano to parallel TB6560 cnc driver board adapter

This is my little Arduino nano to parallel TB6560 cnc driver board project. Started some time ago using a red TB6560 4-axis board (before that i had an green 3-axis TB6560). At the moment the TB6560 alu case version is my preferred choice (but over time i can not remember why the red board was annoying me). The adapter should also work with 3-axis TB6560 boards if the Pinout is the same.

  • KiCad files are included if you have special needs.
  • Gerber files are included if you want to order your own pcb for e.g. at jlcpcb.com
  • STL file of simple mount plate made with OpenSCAD is included if you have a 3d printer

Just work in progress current revision 1.4 using GRBL 1.1h.

First try Version history Revision 1.0 and 1.1 Connected to tb6560 with simple mount Revision 1.3 Used boards

Known bugs of rev. 1.3

  • holes for resistors are to close for "normal" resistors. my fault this is my first pcb project. i choose a wrong footprint.
  • silk outline for X, Y, Z leds on pcb has wrong orientation (my fault or bug in KiCad library?)

KiCad schema

KiCad Schema

KiCad pcb wiring

KiCad pcb wiring

KiCad pcb 3d preview

KiCad pcb wiring

BOM for revision 1.4

Quantity Pos Part
1 pcb from pcb manufacturer of your choice
1 J1 DSUB-25 female horizontal
5 R1-R5 1k Ohm resistor
1 Q1 2N3904 transistor
2 SW1,SW2 tactile push buttons 6x6
3 D1-D3 led 5mm
5 J3,J4,J6,J8,J9 jumper header 2 pins
3 J2,J5,J7 jumper header 3 pins
5 jumper
2 15 pin single row female straight header strip 2.54mm pitch for arduino nano

Simple mount in OpenSCAD

Simple mount in OpenSCAD

Revision photos

Picture Revision Comment
KiCad pcb wiring 1.0 first dirty revision to get rid of the spaghetti grbl adapter ;o)
KiCad pcb wiring 1.1 added jumper headers for the two versions (red pcb, alu case) of the TB6560
KiCad pcb wiring 1.2 added two buttons for cycle start/resume and feed hold. added probe connector. added inverter circuit for spindle enable.
KiCad pcb wiring 1.3 added leds just for fun.
No real pcb image yet 1.4 fix wrong orientation of leds. fix wrong footprint of resistors. reroute affected tracks.

Pins

Arduino nano GRBL 1.1 DB25 red pcb DB25 alu case version
D8 Disable Stepper 1 16
D2 X Step 2 2
D3 Y Step 4 (+8 A Step) 4 (+8 A Step)
D4 Z Step 6 6
D5 X Dir 3 3
D6 Y Dir 5 (+9 A Dir) 5 (+9 A Dir)
D7 Z Dir 7 7
D9 X Limit 10 (IN1) 10 (IN1)
D10 Y Limit 11 (IN2) 11 (IN2)
D11 Spindle Enable 14 17 (see PWM invert!)
D12 Z Limit 12 (IN3) 12 (IN3)
D13 Spindle Dir
A0 Reset/Abort
A1 Feed/Hold
A2 Cycle Start/Resume
A3 Cooling Enable
GND GND 18-25 18-25

Jumper on board

There are some jumpers to configure the board for the two used 4-axis board versions.

Jumper Description
J2 connect Disable Stepper to pin 1* or pin 16**
J3 connect Y Step pin 4 to A Step pin 8
J4 connect Y Dir pin 5 to A Dir pin 9
J5 connect Spindle PWM to pin 14* or pin 17**
J6 Probe connector
J7 use PWM, inverted PWM or disable (no jumper)
J8 connector for alternative feed hold button
J9 connector for alternative cycle start/resume button

*red board version / **alu case version

PWM invert

TB6560 boards use low as spindle enable and high as spindel disable (WTF!?). It is the opposite way of how GRBL handle spindle enable/PWM. The used invert circuit will fix this. But there is a little gap where the invert is not active during startup/shutdown.

!!! As a workaround for now -> power on arduino at first and power off at last again to prevent injury through spindle.

KiCad Schema

Sources:

My current GRBL settings

$$
$0=10
$1=25
$2=0
$3=5
$4=0
$5=0
$6=0
$10=1
$11=0.010
$12=0.002
$13=0
$20=0
$21=0
$22=0
$23=0
$24=25.000
$25=500.000
$26=250
$27=1.000
$30=1000
$31=0
$32=0
$100=402.000
$101=402.000
$102=402.000
$110=1500.000
$111=1500.000
$112=750.000
$120=42.000
$121=42.000
$122=42.000
$130=2000.000
$131=2000.000
$132=2000.000

Probe G Codes

G38.2 z-10 f1

http://www.linuxcnc.org/docs/2.6/html/gcode/gcode.html#sec:G38-probe

G92 z19.2

http://www.linuxcnc.org/docs/2.6/html/gcode/gcode.html#sec:G92

bCNC custom user button

Evaluate gcodes to test with bCNC custom user button.

G38.2 z-100 f5 
G92 z19.7
G0 z50 f600

KiCad pcb wiring

Compiling GRBL

Download, extract and copy GRBL to the Arduino library. More details see here: https://github.com/gnea/grbl/wiki/Compiling-Grbl

Arduino IDE settings:

  • Tools -> Board -> "Arduino Nano"
  • Tools -> Processor -> "ATmega328P (Old Bootloader)"
  • Tools -> Port -> "/dev/ttyUSB0" (may vary)
  • Tools -> Programer -> "Atmel-ICE(AVR)"

Arduino nano pinout

GRBL PWM enabled GRBL
KiCad pcb wiring KiCad pcb wiring

Only for comparison GRBL on STM32F103C8T6 (bluepill)

Just for info. Interesting board with much faster cpu and more memory. https://github.com/usbcnc/grbl

other Source

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My private small project for arduino nano to tb6560 cnc boards.

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