z offset commissioning, auto home now stops at Z = 0

Discussion in 'Calibration, Help, and Troubleshooting' started by JamesBusterG, Sep 15, 2016.

  1. JamesBusterG

    JamesBusterG Member

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    Hi,

    I am commissioning and have got as far as Calibrating Z Offset.

    After I have set the IR sensor on the belt, the manual says auto home again. At this stage my nozzle is still touching the glass bed?

    After doing auto home, the nozzle is 0.1mm off the glass and the offset shows 5mm.

    I know this as when I move the Z axis, if I raise the bed 0.1mm it touches the nozzle.

    Therefore I then set the offset to 0.00, when I run auto home again the print head returns to X 175 Y 100 Z 0.

    The next bit of the manual seems to imply that the print head will auto lift to a point off the glass?

    Thanks

    bb2.jpg bb1.jpg
     
  2. Greg Holloway

    Greg Holloway Administrator
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    Is it my eyes going funny or if the IR sensor not parallel to the bed? That can effect the reading.

    Try running a print and see what happens.
     
  3. JamesBusterG

    JamesBusterG Member

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    I put 2 2mm drill bits down to see if the IR is level.

    bb3.jpg
     
  4. Greg Holloway

    Greg Holloway Administrator
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  5. JamesBusterG

    JamesBusterG Member

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    Photo or IR sensor!

    Thanks
     
  6. Greg Holloway

    Greg Holloway Administrator
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  7. Henry feldman

    Henry feldman Well-Known Member

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    I am having this exact issue (frustrating since my old non-hybrid never had this) in getting it to reliably set Z (either grinds in or floats above)
     
  8. JamesBusterG

    JamesBusterG Member

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    Hello Henry,

    My 'problem' was that I thought the manual implied it would automatically drop the bed a few mm after auto homing. So that you would need to raise it to find if zero was set correctly.

    It still doesn't do that.
     

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