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  1. #1
    Join Date
    Mar 2009
    Location
    Midland WA
    Posts
    45

    Default Z axis stepper motor playing up.

    Today I was getting all ready to start posting pics on my first table top job. I rough planed the pieces, got my shiny new biscuit cutter out
    glued it all together a couple of days ago.
    Today I started facing it off in the router, just as it came to the end of the first section the Z axis went up instead of down
    I hit the stop, took the spindle away from the job and used the jog to raise and lower it a few times. Even though I jogged in the same
    direction the stepper motor changed directions and made lots of noise?? I changed the Z and Y axis around and the controller was fine
    it's the stepper motor?

    Is this a standard problem eg - stepper motor stuffed or is there something that I could look at a wire shorting out?
    I checked the resistance across the 4 pins and it's still 2 pairs, no open circuit or short that I could find.

    Any ideas beside order a new stepper motor.

    Cheers,

    Ian

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  3. #2
    Join Date
    Nov 2006
    Location
    Darwin HowardSprings
    Age
    52
    Posts
    1,197

    Default

    1 broken wire in the cable chain on the z axis

    mine did the same after about 40 hours "china 6545 "
    you might as well swap out the y axis wire as well, because mine went 20 hours later after fixing the z axis , at the same time i changed all the plugs to Molex 4 pin plugs

    look for a fine wire bundle in the 4 core , ment for continuous bending
    how come a 10mm peg dont fit in a 10mm hole

  4. #3
    Join Date
    Mar 2009
    Location
    Midland WA
    Posts
    45

    Default

    Thankyou Sir, I'll check that out in the morning, or maybe tonight. that'll make me happier.

    I'll just change em all if that's the case.

    Ian

  5. #4
    Join Date
    Mar 2009
    Location
    Midland WA
    Posts
    45

    Default

    Well I got the trusty old multi meter out
    and you're right on the money,
    as always there's someone in the forum who's
    had the experience or has an idea of where to start.

    Thanking you kindly for pointing me in the right direction, I'll
    head out this arvo and get enough cable to replace them all and
    maybe make them a bit longer too.

    Ian

  6. #5
    Join Date
    Mar 2009
    Location
    Midland WA
    Posts
    45

    Default

    You were so right,

    I couldn't get the cable I needed straight off so
    I improvised, which I must say worked well
    for about another hour and a half and then
    out went another wire. This time on the "Y" axis.

    I found another problem about the same time as I bumped against
    the table whilst it was cutting. 240v bites hard when you're the
    earth. After running the meter over it, appears the spindle has
    no resistance from the pins to ground. Whenever I crank up the
    spindle speed, it's 240v to the body of the spindle and then
    of course the CNC bed.

    I'm starting to get the feeling that my 6090 was built on a Friday afternoon
    or maybe by someones kid staying back in detention.

    I got my new cable today, all looks very nice and I got a bit extra.
    A couple of pic's to show that it now has no volts leakage to frame or earth.
    Attached Images Attached Images
    • File Type: jpg 1.jpg (160.1 KB, 11 views)
    • File Type: jpg 2.jpg (139.5 KB, 11 views)

  7. #6
    Join Date
    Dec 2004
    Location
    Up North
    Posts
    1,799

    Default

    On my Chinese CNC I found all the spades in the box were not crimped very well, pull on the spade and the wire comes off.
    Tried to buy new spades but they are an odd size nobody around here carries.
    So I soldered them on instead.
    Very sloppy workmanship
    Every day is better than yesterday

    Cheers
    SAISAY

  8. #7
    Join Date
    Nov 2006
    Location
    Darwin HowardSprings
    Age
    52
    Posts
    1,197

    Default

    240v too earth ??? once again

    please get your spindles / all axis EARTHED , some ones gonna die ,

    did you find the problem ? take the plug off the top of your spindle ( with the Machine UNPLUGED ) and put an OHM's test from each pin to the out side side case , if its not in the milliohm range , your spindle is faulty

    if your machine was earthed , the earth leakage would have tripped ,
    with no earth , and rubber feet , its a death trap
    your lucky you werent barefoot on wet floor( it wont bite anymore , it will kick you )
    how come a 10mm peg dont fit in a 10mm hole

  9. #8
    Join Date
    Mar 2009
    Location
    Midland WA
    Posts
    45

    Default

    Replaced the Spindle motor with one that wasn't
    built on an off day, kindly looked after again by
    Geoff. Rodm also sent an earth lead, so I ran earths to everything I
    could find.

    As I had been reading about some people earthing their
    machines, but the comments were more to do with reducing
    noise rather that the spindle motors being faulty from new.
    I was making up some earth straps but hadn't fitted urgently
    as the G540 had no hiccups with noise. I had taken the shielded
    cable off the spindle as the one supplied was too big for the fitting
    which of course I could've used the 4th wire to earth. Now it has it's
    own earth wire.

    Ian

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