My new bargain milling machine - wiring help

  1. fizzy Forum Supporter

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    5,095
    uk
    So pleased with this purchase. This is the first milling machine I have that is actually usable! OK it is pretty basic - no quill and no power feeds but it will do for now until I get the others working.

    Bought it on Ebay - said buyer collects but fair play the bloke did a great palletising job. Bolted down so nice and stable to a full size pallet.

    Marlow mk2 - very little use very good condition.

    20180920_165936.jpg



    Just opened the switch cover - can anyone tell me how to wire it please? 4 wire cable and plug to be fitted but I can only see 3 terminals! 20180920_165922.jpg


    20180921_192054.jpg
     
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  2. MattH

    MattH Member

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    It’s 3ph & Earth. No neutral required.
    If your cable has a neutral just isolate it and leave it disconnected.
    Make sure the motor is set to the correct voltage I.e. star or delta.
     
  3. Seadog

    Seadog Forum Supporter

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    If it's single phase, green is earth, black is neutral and red is phase.
     
  4. Hopefuldave Intergalactic pot-mender

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    Those are your three phases incoming, earth goes under the clamp on the bottom right...

    Dave H. (the other one)
     
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  5. MattH

    MattH Member

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    Green is not earth. Please don’t hook it up like this.
     
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  6. Hopefuldave Intergalactic pot-mender

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    But earth is NEVER switched and that's a switch/disconnector Fizzy's wiring into....

    Dave H. (the other one)
     
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  7. fizzy Forum Supporter

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    5,095
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    Matt - i have wired quite a few 3 phase welders etc and my big bandsaw but star and delta and over my head lol.

    What is that green wire for? is it a ground or one of the lives? Can only see 3 terminals connected.
     
  8. fizzy Forum Supporter

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    5,095
    uk
    Yes that s what i thought. Does the ground go to the machine?
     
  9. MattH

    MattH Member

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    The three terminals are the three live phases. As Dave said the small stud bottom right is the earth clamp.
    No neutral.

    Star delta will be printed on the motor plate for either 240v or 415v operation (both still 3ph).
     
  10. fizzy Forum Supporter

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    5,095
    uk
    Thanks for that - yes it is 415V.
     
  11. Hopefuldave Intergalactic pot-mender

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    As Matt says, the motor will identify itself as star and/or delta, star for 415, delta for 240 - it's *usually* just moving / making links in the 6-terminal box on the side of the motor to switch.

    Dave H. (the other one)
     
  12. merryman Member

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    467
    Location:
    Lancaster, England
    I think you are missing the point, looks like two phases (red and black) are jumped to the little screw (M something) that has got to be wrong hasn't it?
     
  13. MattH

    MattH Member

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    3,652
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    That’s a hole, those two phases are probably feeding the light.
     
  14. Pete.

    Pete. Member

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    Kent, UK
    It looks like the end of an old 3-core single phase power lead. Red black and green are usually what Seadog said but in this instance it's been mis-used. The green has been wired into the switch but the outgoing lead has it cut off flush.

    That thing needs a total re-wire IMO.
     
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  15. fizzy Forum Supporter

    Messages:
    5,095
    uk

    Worrying. It came out of an engineering college! We actually collected it straight from there. Spare machine only used occasionally.
     
  16. fizzy Forum Supporter

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    5,095
    uk
    It does have a lo volt light fitted - no bulb though.
     
  17. rory1

    rory1 Member

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    I’ve got exactly the same Marlow mill, I have it running off a 240-415 vfd
     
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  18. MattH

    MattH Member

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    3,652
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    I wouldn’t worry to much about it. Colours mean nothing once inside a machine, they could all be black and it wouldn’t matter.
    Yes, the third conductor in the wire running to the light being cut of flush is a bodge but not the end of the world. Make sure you have a good earth on it and then get in with the rest of your life.
     
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  19. fizzy Forum Supporter

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    5,095
    uk
    I have considered using a vfd - which one do you have? They seem to have come down a lot. Less than £100. A lot more versatile.

    Stupid question - how do you remove the collet chuck? Is there a drawbar - haven't looked yet.
     
  20. rtbcomp

    rtbcomp Moderator Staff Member

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    18,615
    Location:
    Sheffield UK
    Looks like the green/red/black wires are coming out of the switch into the machine, the red & black to a light or something (as said).

    The incoming side to the switch has been removed and comes from below, it's terminated under the small paxolin panel, you can just see the screw on the black phase.

    As said, the earth goes to the clamp at the bottom right.

    Don't forget to fit a gland to the incoming cable.
     
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