working through the turret home set procedure now
We never took a=our turret off. however a crash bad enought to break the holder off the turret. WOW can't imagine how hard it hit. The mazak gu got our close to possition by playing with the mrj numbers and turret home possition numbers. tricking it around many times back and forth to get it back to the right possition. Don't ask me how he did it though. wouldn't be suprized if your taking the whole turret off to fix your mess. betting the pins in the back are bent. AND YES I SAID THE PINS IN THE ****BACK**** = completely apart.
I took a SQT 250 (fusion control with servo turret) 2 axis apart several years ago.
The operator crashed in X and managed to rip a tool out of the turret in the process.
There was a ticking sound as the turret indexed between stations I suspected bent teeth on the curvec and/or motor.
Upon disassembly, both the curvec and motor had damaged teeth. The pins holding the curvec to the turret body were sheared over 1/16".
Wound up drilling those pin holes clear thru into the back of the turret to get the pins to seat properly, the turret body was that badly damaged.
The post that the turret turns on was pulled out and the damage to it repaired.
As Zac300sy posts :
"But, since this is a non-lifting style turret you probably will have to remove the turret & keep digging till you get to the taper pins waaay down in the bottom. Couple of days of work. Lotta dissasembly from the front + even more in the back"
Yes working inside "the back" of the turret is back breaking work, to stone off the creaters around the mounting bolt holes for the shaft the turret turns on, and getting it square with the body again.
This was 3 busy days for 2 of us. New 3 Pc. curvec and motor $$$$$$ taper pins 2" longer than normal, several boxes of new bolts some 1" longer than normal to get back into solid metal to clamp the bottom curvec down.
Other than the actual turret having distortion on 2 pockets, things went back together well with the usual:
Re-aligining the spindle so it would cut straight.
Verifing the tool eye settings.
Resetting the MRJ-2 home position, Etc.
The operator was given a bunch of time off w/o pay, hoping he would go somewhere else. He didn't, and smacked it again a couple of months later doing the same aw sh... on more of the same part. He was gone in seconds this time. The careful attention to detail on the first repair, and all new high quality bolts saved the day for the curvec and motor on the second time around.
The points of the story: 1. The operator NEEDS to learn from his mistakes. If that is suspect, expect repeat crashes! -or- flip him to the competition.
2. To fix it right takes a lot of work, and it's worth it.
MattG : Since it was the sub spindle, you may want to look over the bolts that hold the sub to the axis and look for pulled threads in the iron, bent pins or streached bolts. My sons boss sent the sub into the chip pan (pulled the screws out of the iron) when he taught the tool for the sub to the wrong spindle. Not sure what was done on yours, but look things over very carefully.
Yes and on a side note the subspindle bearings seem to be a bit weak when it comes to crashes. Run the spindle thru the entire speed cycle and listen for any roughness or vibrations.
My sons boss sent the sub into the chip pan (pulled the screws out of the iron) when he taught the tool for the sub to the wrong spindle.
Have these people never heard of the Rapid Overide switch? And the Feed Hold button? And the Distance To Go on the screen? And the Tool Path Graphics??
And as far as loading a part backwards...that's a situation where the programmer/setup man/owner has to "foolproof" the chuck jaw setup, so a part can't be loaded backwards. A pin here, a plug there, a smaller bore near the back, etc.
Geez man, all it takes is a little patience, and a little common sense, to keep from damaging a cnc machine.
You get what you pay for.....
Originally Posted by cnctoolcat
The shop I am at currently has a brand new 7 axis Hanwha XD20h with hp coolant.
I was given a minimum wage zero experience temp with a "fried brain" as an operator.
It's been a month and he still hasn't grasped how to read a caliper.
The machines don't stand a chance when operated by minimum wage "press operators"
that could care less what they are doing.
Just my .02 cents worth.
"My sons boss sent the sub into the chip pan (pulled the screws out of the iron) when he taught the tool for the sub to the wrong spindle."
I stated that wrong. The owners son, that is my sons boss did that over 10 years ago. He now runs the place. It was a real learning experience for him for ragging on another of his employees for doing the same thing a few days before. It is very easy to do, and many of these machines have it done to them when it is the first sub spindle in a single spindle shop.
Originally Posted by cnctoolcat
Last edited by hitandmiss; 10-12-2012 at 08:43 PM.
Reason: First quote didn't come thru
And as far as loading a part backwards...that's a situation where the programmer/setup man/owner has to "foolproof" the chuck jaw setup, so a part can't be loaded backwards. A pin here, a plug there, a smaller bore near the back, etc. [/QUOTE/]
The jaws are foolproof one end is round one is square, the jaws are cut to the exact shape of the part. Didn't know it could get any easier than that. Most people learned at about the age of 2 maybe 3 that round pegs don't go in square holes.