I have a Sharp 2412 with a fanuc control. It spends most of it's time offline. I had the PSU in the combo drive repaired last year. After about 3 months of the machine being off, I powered it up normally and did a zero reference return (full rapid) and while the Z axis was moving up it felt like it crashed (could feel it in the concrete under my feet) but when I checked it's position it wasn't beyond the home reference position marker. Well the PSU had blown again (overvolting) so I figured it sent an abnormal current to the servo during the zero return and then it went into some kind of failover mode that e-stopped the axis.
So anyways I had to send the PSU back out for repair again, while that's being done I decided to do a full service on the machine. While I'm up on the Z axis replacing the oil metering units, I notice a loose chunk of steel I immediately think "oh great, something did break after all" I fished it out of there with a magnet and it looks like a physical stop for the z axis?!? I dont see a part for this on the Sharp parts book. My software AND limit switch failed? This is kinda crazy that it appears my Z axis almost shot off the rails... Is this what happened? I can't think of any other scenario. It looks like it was ripped out of the casting of the Z axis servo housing and sheared one of the bolts off... so it was definitely some extreme force. How could this happen? Did my limit switch fail?
See pictures below:
No physical stop like this in parts diagram (previous owner added them in?)...
So anyways I had to send the PSU back out for repair again, while that's being done I decided to do a full service on the machine. While I'm up on the Z axis replacing the oil metering units, I notice a loose chunk of steel I immediately think "oh great, something did break after all" I fished it out of there with a magnet and it looks like a physical stop for the z axis?!? I dont see a part for this on the Sharp parts book. My software AND limit switch failed? This is kinda crazy that it appears my Z axis almost shot off the rails... Is this what happened? I can't think of any other scenario. It looks like it was ripped out of the casting of the Z axis servo housing and sheared one of the bolts off... so it was definitely some extreme force. How could this happen? Did my limit switch fail?
See pictures below:
No physical stop like this in parts diagram (previous owner added them in?)...