Fadal 15XT Z-Overload on Peck Drilling
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  1. #1
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    Default Fadal 15XT Z-Overload on Peck Drilling

    Chip-break cycle rather, 27/64 drill in D2 plate 1” deep. The machine started doing freaky things a couple of days ago. The cycle will begin at the first hole and peck 0.100” deep, retract 0.100” to break chip, peck to 0.200” etc. On the third/fourth peck, Z will no longer retract and the feed will decrease (but continue) while the Z servo load increases significantly.

    The creeping up of the Z servo load is shown in the attached photo. Machine will E-stop and throw a Z Axis Overload Alarm when the value at 7022 in photo gets to 9xxx. This is the axis load, correct?

    Further, though the Z depth is programmed for -1.200”, the actual depth drilled is 0.400” or so, when it doesn’t alarm out. Control states the 1.200” depth has been reached when you watch it.

    1. Way lube operational
    2. Z slides oiled manually, no mechanical resistance
    3. Drilling via MPG works as intended, correct Z depth, no increased axis load
    4. Peck drill cycle vs. drilling with constant feed causes same alarm condition
    5. Cycling on/off, tried it after sitting overnight = no change
    6. Drill is not moving/slipping in chuck. Confirmed tool height.

    Z axis servo amp? I’m at a loss. Thank you all.

    5399be70-4b6a-4b9e-9774-af9b7bfdeeac.jpg

  2. #2
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    That number is the following error.

    Have you tried running the drill cycle in air?

    If you long hand a drilling cycle, does it do the same thing?

  3. #3
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    Sounds like a servo needs replacing. How's the sound? Possible the motor is on the way out?

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    It has nothing to do with the peck drilling.
    its your z axis. motor, ball screw turcite , oil issue on z axis or counter weight system) maybe electrical
    try these things 1st to eliminate the the problem
    run the program at 25% rapid and 50% rapid.
    run the program with the Z0 4"-6" higher ( this will tell if you have a mechanical bind at some location or counter weight chains dragging)






    Quote Originally Posted by RC Mech View Post
    Chip-break cycle rather, 27/64 drill in D2 plate 1” deep. The machine started doing freaky things a couple of days ago. The cycle will begin at the first hole and peck 0.100” deep, retract 0.100” to break chip, peck to 0.200” etc. On the third/fourth peck, Z will no longer retract and the feed will decrease (but continue) while the Z servo load increases significantly.

    The creeping up of the Z servo load is shown in the attached photo. Machine will E-stop and throw a Z Axis Overload Alarm when the value at 7022 in photo gets to 9xxx. This is the axis load, correct?

    Further, though the Z depth is programmed for -1.200”, the actual depth drilled is 0.400” or so, when it doesn’t alarm out. Control states the 1.200” depth has been reached when you watch it.

    1. Way lube operational
    2. Z slides oiled manually, no mechanical resistance
    3. Drilling via MPG works as intended, correct Z depth, no increased axis load
    4. Peck drill cycle vs. drilling with constant feed causes same alarm condition
    5. Cycling on/off, tried it after sitting overnight = no change
    6. Drill is not moving/slipping in chuck. Confirmed tool height.

    Z axis servo amp? I’m at a loss. Thank you all.

    5399be70-4b6a-4b9e-9774-af9b7bfdeeac.jpg

  5. #5
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    Moved tool offset +4.0”, cut air. No problem, 30-32 following error. Kept Z height at part zero, moved 12” in X to clear part/vise and cut air, 30-32 following error.

    Programmed for 22 SFM rather than 200 SFM for HSS in D2. No problems. One dope-slap for me.

    Thanks everyone.

  6. #6
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    Quote Originally Posted by RC Mech View Post
    Moved tool offset +4.0”, cut air. No problem, 30-32 following error. Kept Z height at part zero, moved 12” in X to clear part/vise and cut air, 30-32 following error.

    Programmed for 22 SFM rather than 200 SFM for HSS in D2. No problems. One dope-slap for me.

    Thanks everyone.
    Broaching the hole didn't work? I'm really surprised it didn't alarm out.

  7. Likes RC Mech liked this post

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