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  1. #1
    Join Date
    Jan 2007
    Posts
    99

    Z Axis Backlash

    My NM-135 has developed quite a bit of play or backlash in the Z axis. If and when I get the proper x axis lead screw, I will tear the machine down and fix as many of the problems as possible all at once. In the meantime, I need a temporary solution for the Z problem, so I thought I would ask here.

    I would like to slow down the rapid setting on the Z axis only, in order to lessen the shock on the system and buy me some time. Does anyone know if there is a way to do this easily in Mach3?

    Thanks for any suggestions you have, -Greg
    "If Necessity is the Mother of Invention, then Who's the Father?"

  2. #2
    Join Date
    Jun 2007
    Posts
    3891
    Quote Originally Posted by gleas View Post
    My NM-135 has developed quite a bit of play or backlash in the Z axis. If and when I get the proper x axis lead screw, I will tear the machine down and fix as many of the problems as possible all at once. In the meantime, I need a temporary solution for the Z problem, so I thought I would ask here.

    I would like to slow down the rapid setting on the Z axis only, in order to lessen the shock on the system and buy me some time. Does anyone know if there is a way to do this easily in Mach3?

    Thanks for any suggestions you have, -Greg
    go into motor tuning, pick the Z axis, lower the rapid speed, hit save motor settings.

    on the mechanical side, not sure if you read what i wrote in the other thread. the issue may be as simple as the ball screw support bearing being loose. its at the top of the column if i recall, but i dont know if its reachable without pulling off the cover.

  3. #3
    Join Date
    Jun 2007
    Posts
    3891
    ah crap, its at the bottom.

    heres the sieg kx3 manual. mechanically its almost the same as the novakon.
    https://www.machinetoolswarehouse.co...s/KX3-Mach.pdf

    page 42 is the parts diagram. in the sieg model the electrical box looks like it easily pops off. not sure if the novakon is the same. my kx1 is alot harder to pull apart. if you look at the part number 88, those are the lock nuts that tighten the bearings. most likely this is the source of your backlash.

  4. #4
    Join Date
    Jan 2007
    Posts
    99
    ihavenofish

    Thanks for the research. I have a Smithy pdf manual and it pretty much ditto. I do plan on opening it up and fix a few things but I have some jobs to run in the next month or so.

    I checked in motor tuning and I don't see anything having to do with rapids. Just acceleration, velocity, etc.

    Thanks, -Greg
    "If Necessity is the Mother of Invention, then Who's the Father?"

  5. #5
    Join Date
    Feb 2007
    Posts
    4553

    Post

    Greg,

    If you lower the Velocity, that will reduce "IPM" the inches per minute or traverse rate.

    Jeff...
    Attached Thumbnails Attached Thumbnails Velocity.jpg  
    Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.

  6. #6
    Join Date
    Jan 2007
    Posts
    99
    Quote Originally Posted by jalessi View Post
    Greg,

    If you lower the Velocity, that will reduce "IPM" the inches per minute or traverse rate.

    Jeff...
    Jeff,

    If I lower velocity wouldn't that just lower the max feed rate?

    I'm trying to reduce shock, so shouldn't I lower acceleration if that's all I have to play with?

    Or am I wrong on that?

    -Greg
    "If Necessity is the Mother of Invention, then Who's the Father?"

  7. #7
    Join Date
    Jun 2007
    Posts
    3891
    Quote Originally Posted by gleas View Post
    Jeff,

    If I lower velocity wouldn't that just lower the max feed rate?

    I'm trying to reduce shock, so shouldn't I lower acceleration if that's all I have to play with?

    Or am I wrong on that?

    -Greg
    ah, i see. yeah, then acceleration could be lowered.

  8. #8
    Join Date
    Jan 2007
    Posts
    99
    Ok, lowering the acceleration worked. The graph looks a little like a flat top pyramid, but no hammering effect on drill cycles etc. This should buy me some time.

    Thanks guy's for the input,

    -Greg
    "If Necessity is the Mother of Invention, then Who's the Father?"

  9. #9
    Join Date
    Jun 2007
    Posts
    3891
    Quote Originally Posted by gleas View Post
    Ok, lowering the acceleration worked. The graph looks a little like a flat top pyramid, but no hammering effect on drill cycles etc. This should buy me some time.

    Thanks guy's for the input,

    -Greg
    cool. what setting is it at?

  10. #10
    Join Date
    Jan 2007
    Posts
    99
    The Velocity is 75
    The Acceleration is 3.36

    Haven,t run anything with the new settings, but it's definitely quieter.

    -Greg
    "If Necessity is the Mother of Invention, then Who's the Father?"

  11. #11
    Join Date
    Jun 2007
    Posts
    3891
    Quote Originally Posted by gleas View Post
    The Velocity is 75
    The Acceleration is 3.36

    Haven,t run anything with the new settings, but it's definitely quieter.

    -Greg
    3.36? that pretty slow. do you hear it accelerating over a long time? default is around 25-30 right?

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