commissioning Z axis question

Discussion in 'BigBox General Chat' started by R Design, Mar 4, 2016.

  1. R Design

    R Design Well-Known Member

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    Build manual says "move IR sensor as low as possible". So it' s a centimetre or two below the nozzle.

    Later you do the first Auto Home with Z offset set to "-5mm".

    So the nozzle is then a LONG WAY above the glass plate.

    Then you are supposed to move the glass bed up until it touches the nozzle, in 0.1mm increments.

    I can move it up 5mm. But no more.

    So the bed is still a long way from the Nozzle?

    What to do?
     
  2. Spoon Unit

    Spoon Unit Well-Known Member

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    Hi R,

    Are you building a dual?
     
  3. R Design

    R Design Well-Known Member

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  4. Spoon Unit

    Spoon Unit Well-Known Member

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    I have a dual, so I can't be certain about commissioning yours. I did have a similar problem and, after a searching on the forum, turned the lead screws by hand to get the level where I needed it.
     
  5. Mike Kelly

    Mike Kelly Volunteer

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    The IR sensor needs to be higher than the nozzle. Like 1-2mm, not cm.

    ie: if you're raising the bed, the nozzle would touch before the IR
     
  6. 69charger

    69charger Active Member

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    Had this same issue. I've never gotten the offset to work properly. Waiting for a youtube video of the process :) I just adjusted mine manually, which I'm used to from the Robo3D R1.
     
  7. R Design

    R Design Well-Known Member

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    OK I think it's sorted now guys.

    It's just very unintuitive.

    You have to set the offset LOW (like the -5mm suggested in the manual) in order to then be able to raise the bed towards the nozzle (after an autohome).

    Doesn't seem to be another way of doing it. Otherwise it blocks.

    Then you can enter a new Z offset, after a calculation, but then, after the next auto home, that will not bring the bed up to where you had it (touching the nozzle) but a little way off.

    The confirmation that the the BB has understood what you want comes when you crank the bed up manually and when it displays Z=0 then the bed is touching the nozzle as you wanted it.

    Grrr.
     
  8. Spoon Unit

    Spoon Unit Well-Known Member

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    Doesn't sound like the optimal path, but you found a path !. Well done :). Next !
     
  9. R Design

    R Design Well-Known Member

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    haha

    is there a guide somewhere to our firmware somewhere, written in a way that makes sense for the BB implementation?
     
  10. Spoon Unit

    Spoon Unit Well-Known Member

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    I don't know about a guide, but Richard Caunt has already modified it and supplied some details. I forget whether that was here in the forum or on G+. He altered the orientation of the dial rotation, increased bed movement speed, and a couple of other things.
     

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