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  1. #1
    Join Date
    Nov 2012
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    11

    Post SL-403 Z-axis Geometry

    The Geometry values in Z move .004 to .006 when using Tool Pre-setter to probe tools and then operator has to compensate with the wear offset in the opposite direction. something is giving the machine false calculations on the Geometry length of all tools when they are probed. Has anyone experience this issue?

  2. #2
    Join Date
    Feb 2009
    Posts
    6028
    Are you talking about the tool pre-setter, or are you using some other probe?

  3. #3
    Join Date
    Nov 2012
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    11
    Tool Pre-setter

  4. #4
    Join Date
    Aug 2011
    Posts
    2517
    you need to re-calibrate the tool setter and correct the error using parameters 5015/5016/5017/5018
    5018 relates to Z+ so look at that one first. If you add or subtract -.004 from the number that is there that will fix it. Or re-set the entire setting arm and all 4 switches.

  5. #5
    Join Date
    Feb 2009
    Posts
    6028
    Doubt a 403 has the 4 switch type, probably the square carbide renishaw one. As stated adjust those parameters, but before you do, you need to make sure that block is square to the axis with an indicator. Should be within .0001", easy to adjust.

  6. #6
    Join Date
    Aug 2011
    Posts
    2517
    urg. I mean't all 4 parameters. my machine has the square carbide Renishaw type and it's using those 4 parameters to calibrate it.

  7. #7
    Join Date
    Nov 2012
    Posts
    11
    I have reset paramaters and replaced tool pre-setter on this machine for this issue 4 months ago but problem still exist. The geometry will move about .005 plus or minus in a weeks time and operator has to compensate in the wear offset for geometry being off .005.The machine was not crashed. No slack could be found in ballscrew.
    Help! Anyone seen this issue before?

  8. #8
    Join Date
    Aug 2011
    Posts
    2517
    if you replaced the entire probe and still have the problem then your issue may be related to Z servo/ballscrew etc damage or failing servo amplifier? was the machine crashed?

  9. #9
    Join Date
    Nov 2012
    Posts
    11
    The machine was not crashed. No slack could be found in ballscrew.

  10. #10
    Join Date
    Feb 2009
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    6028
    Is it a swing down type or removable type.

  11. #11
    Join Date
    Nov 2012
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    11
    Swing Type

  12. #12
    Join Date
    Feb 2009
    Posts
    6028
    Have taken the entire arm off yet? I've had the joint fail from coolant on those, not locking down all the way.

  13. #13
    Join Date
    Feb 2009
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    6028
    And make sure the operator is using jog at the same feed when setting tools, that really makes a difference since mori doesn't have a set federate for touching tools.

  14. #14
    Join Date
    Nov 2012
    Posts
    11
    No, I haven't remove pre-setter arm but I did put a dial indicator on arm and it repeated location on up/down positions.

  15. #15
    Join Date
    Nov 2012
    Posts
    11
    Yes, 100% feedrate.

  16. #16
    Join Date
    Feb 2009
    Posts
    6028
    Then it would seem the arm itself is ok. I'm wondering if someone is not clearing the wear geometry before setting a tool? Other than backlash in the z, the only other thing I could think of is the turret not clamping correctly or debris in the coupling. Does your temp in the shop swing wildly ?

  17. #17
    Join Date
    Nov 2012
    Posts
    11
    No, temp is consistent. Backlash is good and the offsets are close to zero until geometry jumps .oo5. Then we have to compensate for the .005 in the opposite direction that geometry changed.

  18. #18
    Join Date
    Aug 2011
    Posts
    2517
    the wear gets cleared when the tool is set so it doesn't affect the geometry.
    the jog feed should be low, about 10%-20% is good. My arm works fine but I've noticed some minor variation (5-10 microns) if the jog is not low. at 100% it was erratic and had large variation like what you are seeing.

  19. #19
    Join Date
    Nov 2012
    Posts
    11
    We used automatic probing program with controlled feed rates and this issue still exist. It's intermitten but moves at least one time a week. We have been scratching our heads trying to figure this problem out.

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