New member to the forum, and pretty new to CNC maintenance and repair
We have an old clapped out Mori SH-50 that seems to be giving a lot of issues as of late. The machine sat for about 4 months prior to about mid November. We had a powermate alarm after production tried starting it back up due to the battery being dead in the drive for the magazine. Mori came in with a fanuc teach pendant to re-establish the parameters.
Ran good for a little over a week on 1st and 2nd shift, and then it randomly alarmed for EMG. We ended up finding one of the E-stop switches was bad and replaced it. Ran good for another week, and then the tool changer started throwing tools. At first it seemed like a drawbar issue, so checked out the hydraulics and made sure the drawbar wasn't hanging up or something. Then took a slow mo video on my phone, and noticed the tool seemed to be going in too high.
Commanded 2nd reference position and manually operated tool arm with a tool in it and discovered the Y axis was low by over 1/2". Mori came in the following Monday and the machine was again alarmed for EMG. He checked all the E-stops again and they were good. If you reset by using the 2nd OT button and green power button, the servos would power back up, but as soon as you let go of the O.T. release, it would instantly alarm out for EMG again. Then all of a sudden the tech said it just started working again out of the blue. He homed the machine out, commanded 2nd reference, and did a bunch of tool changes with no problem. He stayed for a bit just to double check some other issues, but said it should be fine.
That night, the operator was trying to set it up and it kept stopping in the middle of tool changes for "Y axis excess" alarms. Early the next morning the 1st shift operator said it started throwing tools again. I commanded 2nd ref. again and the Y was low again by about the same amount as it was before Mori came to look at it. Was told by Mori to power down, re-home again and command 2nd ref. and use manual mode for tool changer to see if it looked closer to where it should be, and it was. Tried a tool change and it went right in. Marked the way cover on X and Y to reference the correct position at 2nd ref. Mori thought the axis card was starting to go in the fanuc drive. Another tech said he thought it was mechanical like a loose ball screw coupling.
Fast forward to today, and it's been running since last Thursday 1-27-22. But now we are getting random door alarms and operators have been having problems getting the pallet doors to release. This morning we have a W.O. stating the machine fails to run pallet 2 continuously, and it stops machining and alarms for the setup door open, when it should continue machining, and allow the operator to set up the next pallet. If they leave the doors open, and reset the alarm, they can restart the program in edit mode where it left off, and then they can resume operation.
Anyone have ideas? Would it be a prox switch not being made somewhere? Programming issue? This thing just needs to go down the road! 25+ years old, and many many hours on it.
We have an old clapped out Mori SH-50 that seems to be giving a lot of issues as of late. The machine sat for about 4 months prior to about mid November. We had a powermate alarm after production tried starting it back up due to the battery being dead in the drive for the magazine. Mori came in with a fanuc teach pendant to re-establish the parameters.
Ran good for a little over a week on 1st and 2nd shift, and then it randomly alarmed for EMG. We ended up finding one of the E-stop switches was bad and replaced it. Ran good for another week, and then the tool changer started throwing tools. At first it seemed like a drawbar issue, so checked out the hydraulics and made sure the drawbar wasn't hanging up or something. Then took a slow mo video on my phone, and noticed the tool seemed to be going in too high.
Commanded 2nd reference position and manually operated tool arm with a tool in it and discovered the Y axis was low by over 1/2". Mori came in the following Monday and the machine was again alarmed for EMG. He checked all the E-stops again and they were good. If you reset by using the 2nd OT button and green power button, the servos would power back up, but as soon as you let go of the O.T. release, it would instantly alarm out for EMG again. Then all of a sudden the tech said it just started working again out of the blue. He homed the machine out, commanded 2nd reference, and did a bunch of tool changes with no problem. He stayed for a bit just to double check some other issues, but said it should be fine.
That night, the operator was trying to set it up and it kept stopping in the middle of tool changes for "Y axis excess" alarms. Early the next morning the 1st shift operator said it started throwing tools again. I commanded 2nd ref. again and the Y was low again by about the same amount as it was before Mori came to look at it. Was told by Mori to power down, re-home again and command 2nd ref. and use manual mode for tool changer to see if it looked closer to where it should be, and it was. Tried a tool change and it went right in. Marked the way cover on X and Y to reference the correct position at 2nd ref. Mori thought the axis card was starting to go in the fanuc drive. Another tech said he thought it was mechanical like a loose ball screw coupling.
Fast forward to today, and it's been running since last Thursday 1-27-22. But now we are getting random door alarms and operators have been having problems getting the pallet doors to release. This morning we have a W.O. stating the machine fails to run pallet 2 continuously, and it stops machining and alarms for the setup door open, when it should continue machining, and allow the operator to set up the next pallet. If they leave the doors open, and reset the alarm, they can restart the program in edit mode where it left off, and then they can resume operation.
Anyone have ideas? Would it be a prox switch not being made somewhere? Programming issue? This thing just needs to go down the road! 25+ years old, and many many hours on it.
