Sending to port Failed

X-Carve Troubleshooting
1

I have made my little x-carve machine based on Arduino, CNC Shield and GRBL 0.9j.
All works fine, moving is ok, communication between PC (UGS and Easel) is ok. Problem
is only when I switch on my spindler. I have used 12-24V Lathe Press Motor with Drill Chuck.
When I switch on this motor, Easel lost connection with Arduino. In Device Manager is port OK,
but in programs (Easel and UGS) is this not OK. In UGS i became message “Sending to port
failed.” Can you help me with this problem?
Thanks, Julo

2

Probability is pulling too much power.
You can use external 24VDC power supply and control that spindle with the relay connected to Arduino. Just like connected Dewalt.

4

Feeding the Arduino board seperate power (7-12V) may also help.

You have either a power surge at spindle start that make the Arduino USB connection droop out, and/or electrical noise from your spindle causing the same.

5

My spindle is not connected with CNC shield, for spindle I have other power supply.

6

What is “proper grounding techniques”? Is there some picture, where can I found this?

7

It is very generic, as your problem is of a generic character.

You have electrical noise that cause problems, you may try:
Feed external power to your Arduino (a 9V battery may suffice for testing)
Keep power wires and signal wires seperate from each other (increase distance)
Keep power wires/stepper motor wires away from USB cable.
Use a USB cable with wire mesh shield / ferrit chokes (to surpress noise picked up by the cable)

1 Like
8

Edit: Deleted brain dead reply. Did not comprehend.

9

Error message :sending to port failed ,while streaming .nc file to arduino
Sys.Arduino uno ,cnc Shield v3,GRBL 3.6.1,UGCS 2 stepper driver Drv 8825

10

Hi Dear Julo

I have exactly the your same problem. I make a CNC about 4 months ago and I used of Arduino and a spindle water cool that it run by an inverter generator (that I have connected both with a 4-string wire without electromagnetic protection because I have read, do not have to use of the electromagnetic protective wire to connect the inverter and the three-phase electromotor ) and I used of my CNC for 4 months with out any problem but now, when I run inverter to turn on spindle, in GRBL was writing “sending to port filed”. I didn’t change any of device in my CNC

If you find the solve of problem, please help me to solve it!

Thanks and regards
Asad