# Sending to port Failed **URL:** \ **Category:** Troubleshooting\ **Created:** [June 21, 2017, 11:40am UTC](https://community.inventables.com/t/sending-to-port-failed/39007 "2017-06-21T11:40:58Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Julo](https://avatars.discourse-cdn.com/v4/letter/j/9dc877/32.png) [@Julo](https://community.inventables.com/u/Julo)\ **Post date:** [June 21, 2017, 11:40am UTC](https://community.inventables.com/t/sending-to-port-failed/39007/1 "2017-06-21T11:40:59Z")
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 ---
**Author:** ![AlanDavis](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/alandavis/32/4710_2.png) [@AlanDavis](https://community.inventables.com/u/AlanDavis)\ **Post date:** [June 21, 2017, 12:16pm UTC](https://community.inventables.com/t/sending-to-port-failed/39007/2 "2017-06-21T12:16:29Z")
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. ---
**Author:** ![HaldorLonningdal](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/haldorlonningdal/32/72377_2.png) [@HaldorLonningdal](https://community.inventables.com/u/HaldorLonningdal)\ **Post date:** [June 21, 2017, 12:20pm UTC](https://community.inventables.com/t/sending-to-port-failed/39007/4 "2017-06-21T12:20:28Z")
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. ---
**Author:** ![Julo](https://avatars.discourse-cdn.com/v4/letter/j/9dc877/32.png) [@Julo](https://community.inventables.com/u/Julo)\ **Post date:** [June 21, 2017, 12:38pm UTC](https://community.inventables.com/t/sending-to-port-failed/39007/5 "2017-06-21T12:38:38Z")
My spindle is not connected with CNC shield, for spindle I have other power supply. ---
**Author:** ![Julo](https://avatars.discourse-cdn.com/v4/letter/j/9dc877/32.png) [@Julo](https://community.inventables.com/u/Julo)\ **Post date:** [June 21, 2017, 12:40pm UTC](https://community.inventables.com/t/sending-to-port-failed/39007/6 "2017-06-21T12:40:18Z")
What is “proper grounding techniques”? Is there some picture, where can I found this? ---
**Author:** ![HaldorLonningdal](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/haldorlonningdal/32/72377_2.png) [@HaldorLonningdal](https://community.inventables.com/u/HaldorLonningdal)\ **Post date:** [June 21, 2017, 12:56pm UTC](https://community.inventables.com/t/sending-to-port-failed/39007/7 "2017-06-21T12:56:45Z")
> [@Julo](#): > > What is “proper grounding techniques”? Is there some picture, where can I found this? 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) ---
**Author:** ![PhantommFangs](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/phantommfangs/32/87296_2.png) [@PhantommFangs](https://community.inventables.com/u/PhantommFangs)\ **Post date:** [June 21, 2017, 7:16pm UTC](https://community.inventables.com/t/sending-to-port-failed/39007/8 "2017-06-21T19:16:36Z")
Edit: Deleted brain dead reply. Did not comprehend. ---
**Author:** ![MaheshJoshi](https://avatars.discourse-cdn.com/v4/letter/m/439d5e/32.png) [@MaheshJoshi](https://community.inventables.com/u/MaheshJoshi)\ **Post date:** [February 26, 2018, 11:20am UTC](https://community.inventables.com/t/sending-to-port-failed/39007/9 "2018-02-26T11:20:50Z")
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 ---
**Author:** ![Asad](https://avatars.discourse-cdn.com/v4/letter/a/848f3c/32.png) [@Asad](https://community.inventables.com/u/Asad)\ **Post date:** [August 4, 2018, 7:35pm UTC](https://community.inventables.com/t/sending-to-port-failed/39007/10 "2018-08-04T19:35:34Z")
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