Fadal 15XT Z-Overload on Peck Drilling

RC Mech said:

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.

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RC Mech said:

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.

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