Leveling and tramming small VMC
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  1. #1
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    Default Leveling and tramming small VMC

    Hey all...I hope you can help me. I’m trying to level and tram my Hurco VM10i VMC. It has 6 leveling feet...2 front, 2 back, and 2 where the head travels along Z (about 16/18 inches in from the rear feet)

    I followed the Haas video on leveling a VMC and I can’t seem to get this right.

    I calibrate my level (SPI 0.0001 / 10” accuracy level).

    I can get the machine level. I can remove the twist. I can remove the bow. But when I sweep my indicator, the machine table is not perpendicular to the spindle axis. Test cuts
    Prove this theory. It was cutting well before I started messing with it, so I know that this machine is sound and accurate and not damaged or anything.

    It’s a 3yr old machine that sees light use so it’s not a structural issue.

    Does anyone have a sure fire method or routine for leveling and tramming a head in? Should I leave the middle screws alone? In fact, what do the middle screws do? They are directly under the Z ways so I would assume they handle head tilt.

    For reference, the spindle sweep with a 0.0001 indicator on a 12” dia circle is (after leveling):

    X- .0002
    X+ .0003
    Y+ (operator side) -.0002
    Y- spindle side .0008
    According to Haas the total delta on all 4 measurements should be less than 0.0005.


    I for the life of me cannot get this thing trammed and facing good again. I understand that level is just a starting place for perpendicularity, but I’m lost here.

    Please help! I don’t want to call my service tech out again and I specifically bought all these tools to NOT have to always call him. Mainly I am practicing on my 3 axis so that I can align the center lines on my 5 axis when they slip out of place every 6 months.

    Thanks for helping a “service noob”

  2. #2
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    Quote Originally Posted by metalmadness View Post
    Hey all...I hope you can help me. I’m trying to level and tram my Hurco VM10i VMC. It has 6 leveling feet...2 front, 2 back, and 2 where the head travels along Z (about 16/18 inches in from the rear feet)

    I followed the Haas video on leveling a VMC and I can’t seem to get this right.

    I calibrate my level (SPI 0.0001 / 10” accuracy level).

    I can get the machine level. I can remove the twist. I can remove the bow. But when I sweep my indicator, the machine table is not perpendicular to the spindle axis. Test cuts
    Prove this theory. It was cutting well before I started messing with it, so I know that this machine is sound and accurate and not damaged or anything.

    It’s a 3yr old machine that sees light use so it’s not a structural issue.

    Does anyone have a sure fire method or routine for leveling and tramming a head in? Should I leave the middle screws alone? In fact, what do the middle screws do? They are directly under the Z ways so I would assume they handle head tilt.

    For reference, the spindle sweep with a 0.0001 indicator on a 12” dia circle is (after leveling):

    X- .0002
    X+ .0003
    Y+ (operator side) -.0002
    Y- spindle side .0008
    According to Haas the total delta on all 4 measurements should be less than 0.0005.


    I for the life of me cannot get this thing trammed and facing good again. I understand that level is just a starting place for perpendicularity, but I’m lost here.

    Please help! I don’t want to call my service tech out again and I specifically bought all these tools to NOT have to always call him. Mainly I am practicing on my 3 axis so that I can align the center lines on my 5 axis when they slip out of place every 6 months.

    Thanks for helping a “service noob”
    First of all, using square block, check the perpendicularity between X and Z and Y and Z axes. If these are OK (leading producer's standard is better than 0.00025/12), proceed to check the parallelism between the X and Y movement and the table surface. Then only proceed to spindle sweep check (leading machine tool producer's standard is better than 0.0003/12). If you do not perform the preliminary checks as stated, the results of spindle sweep are meaningless.

  3. #3
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    Quote Originally Posted by PROBE View Post
    First of all, using square block, check the perpendicularity between X and Z and Y and Z axes. If these are OK (leading producer's standard is better than 0.00025/12), proceed to check the parallelism between the X and Y movement and the table surface. Then only proceed to spindle sweep check (leading machine tool producer's standard is better than 0.0003/12). If you do not perform the preliminary checks as stated, the results of spindle sweep are meaningless.
    OK...so by using the square I can then adjust feet as necessary after seeing how perpendicular and parallel the axes are?

  4. #4
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    Quote Originally Posted by metalmadness View Post
    OK...so by using the square I can then adjust feet as necessary after seeing how perpendicular and parallel the axes are?
    That's exactly the way to do it.

    Stefan

  5. #5
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    Quote Originally Posted by PROBE View Post
    That's exactly the way to do it.

    Stefan
    a little more detail on screw adjustment would be greatly appreciated!


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