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Thread: Not Homing to Z axis

  1. #1
    Join Date
    Sep 2010
    Location
    Houston Area
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    102

    Default Not Homing to Z axis

    Tried to carve a project today. Got error message with "Z Homing axis problem. With Machine off everyting moves freely but still get error message and machine will not proceed.
    Causes? Cures?
    Running current version of software. Ran project yesterday
    Old Trainers never die, The tape just doesn't sitck anymore!

  2. #2
    Join Date
    Jan 2007
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    NE PA USA
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    Default

    Bad FFC Cable.
    Favorite Saying.... "It's ALL About the Brass Roller"..... And "Use MASKING TAPE" for board skipping in the X or breaking bits.

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  3. #3
    Join Date
    Sep 2017
    Location
    Newport, WA
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    Default

    What does FFC stand for? Never heard it mentioned before.

  4. #4
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    Northern Colorado
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    Default

    Quote Originally Posted by MRcarvey View Post
    What does FFC stand for? Never heard it mentioned before.
    Flat whit ribbon cable that is attached to the back of the Z truck.
    RingNeckBlues
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  5. #5
    Join Date
    Jan 2007
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    Default

    The cable will flex and flex and eventually the flat copper between plastic snaps like taking a piece of copper wire and bending and bending.... With the plastic it will let the ends touch then as the head moves in "Y" the ends don't touch... This leads to confusing symptoms of the Z working then not...

    While your ordering 2 cables one for a spare I would order one of 2 sets of Cut Motor Brushes for that 250 cut hour change. Much cheaper than snapping a $40.00 bit when the brushes get too short and stall. Plus you save on shipping...

    PS: And don't forget to get some 685ZZ Bearings for your Y Gearbox to swap at 250 hours too... http://www.vxb.com/SearchResults.asp?Search=685zz

    The ENCODER on the back of the Z can get DIRTY. It is just a disk with lines on it that block the sensor making pulses as seen when you call up the Z Data on the LCD.

    The Encoder wheel can also spin FREE of the motor shaft, as has been posted many times. A drop of super glue fixes that.

    Good Luck,

    AL
    Attached Thumbnails Attached Thumbnails DSC03367_WEB.jpg   DSC01476_WEB.jpg   DSC00488_WEB.jpg   DSC01478_WEB.jpg  

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    Last edited by Digitalwoodshop; 02-07-2018 at 12:14 PM.
    Favorite Saying.... "It's ALL About the Brass Roller"..... And "Use MASKING TAPE" for board skipping in the X or breaking bits.

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  6. #6
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    Sep 2017
    Location
    Newport, WA
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    Default

    I knew that - I wondered what the acronym meant.

  7. #7
    Join Date
    Sep 2010
    Location
    Houston Area
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    Default

    Thanks to all of you who responded. Since I live in Houston I carried it to LHR. Long story short I had several sensors going bad and the belts were cracked. TheZ axis had a couple of teeth missing which was causing the truck to stall in the top position. Also apparently the white lithium grease I was using is no longer recommended. They say it gums up the gears and causes head problems when cold. They are using a 3 in 1 oil with a marine grade grease combo. I am having them do a complete maintainence check and fix.
    Will be glad to have it back.
    Old Trainers never die, The tape just doesn't sitck anymore!

  8. #8
    Join Date
    Dec 2006
    Location
    Brunswick, GA
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    8,116

    Default

    Quote Originally Posted by MRcarvey View Post
    I knew that - I wondered what the acronym meant.
    Flat Flex Cable
    Michael T
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  9. #9
    Join Date
    Jan 2007
    Location
    NE PA USA
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    Quote Originally Posted by mtylerfl View Post
    Flat Flex Cable
    Thanks MT

    I did not even know the answer to that question...

    AL
    Favorite Saying.... "It's ALL About the Brass Roller"..... And "Use MASKING TAPE" for board skipping in the X or breaking bits.

    Follow ME on Facebook http://www.facebook.com/pages/Accoun...50019051727074

    www.PoconoDigitalWoodshop.com

    www.AccountabilityTag.com


  10. #10

    Default

    Flexible flat cable, or FFC, refers to any variety of electrical cable that is both flat and flexible, usually referring to the cable attached to the Z-truck

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