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IndustryArena Forum > CNC Electronics > Spindles / VFD > Ground question on 2.2 kw water cooled spindle
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  1. #1

    Join Date
    Aug 2018
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    21

    Ground question on 2.2 kw water cooled spindle

    My 2.2 pin #4 has continuity with nothing. From what I've researched its probably an unconnected ground. Don't want to pull the back off this
    rt now so I'm wondering - will I be OK just grounding the spindle case or mount block?
    Thanks to all
    cncneon

  2. #2
    Member
    Join Date
    Sep 2005
    Posts
    1712

    Re: Ground question on 2.2 kw water cooled spindle

    Quote Originally Posted by cncneon View Post
    My 2.2 pin #4 has continuity with nothing. From what I've researched its probably an unconnected ground. Don't want to pull the back off this
    rt now so I'm wondering - will I be OK just grounding the spindle case or mount block?
    Thanks to all
    cncneon
    There should be a ground wire in your 4 wire feed to the spindle power, just ground to it. All thats required is you ground to the metal on the spindle. You can not depend on the Z axis being 100% grounded at all times.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router Mach4 Kimber 1911 45ACP

  3. #3
    Registered
    Join Date
    Mar 2007
    Posts
    2083

    Re: Ground question on 2.2 kw water cooled spindle

    from another post here on cnczone a photo of an added earth connection inside a spindle

    Attachment 420072

    at best the chinese are very lax with the earthing on their products
    and do not reserve the green/yellow wires for earth/ground connections !!!

    also don't use the same cable colour code through out

    the photos of one 6040 machine I used to trace the wiring had the stepper motor wires change colour twice
    the cable had different colours to the motor and the wiring inside the cnc control box was different again

    wiring for one machine
    Attachment 420074
    Click image for larger version. 

Name:	control box wiring 2.jpg 
Views:	0 
Size:	72.0 KB 
ID:	420076
    Attachment 420082

    another machine had used different colour cables !

    I suspect they use the cheapest cable available when the machine is made
    and different manufacturers make their own version of what looks like the same machine

    John

    PS
    To avoid opening the spindle motor
    I would have a look to see if you can use one of the 4 screws that fastens the end on the motor or the 4 screws that fastens the connector to attach an earth wire to the motor

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