I cant for the life of me figure this one out.

We had a light crash that moved a facing tool out of the turret and the machine was stopped before anything alarmed. The whole turret and block its on moved back towards the wall .060" and every tool was off in X axis. Where should I start looking? I checked turret alignment and found it within a few thou and checked the gap around the turret to the turret block and it doesnt seem out of whack.

Could I have jumped the servo motor back a rotation?
Could my support bearing be loose?
Could my nut be loose?


Backlash and repeatability are good when checking with an indicator.

Ok turret is way out of alignment. Is it possible to be .180 out of alignment yet nothing broken? What is the procedure for re-alignment of the turret.

you can change the numbers in a wreck while doing only limited damage
i allways figured it was the pinch couple on ball screw slips
just change them back. on the old machines it was the ZP parameter
maybe leland will pop up
what alignment are you talking about?

I think you can just loosen the bolts on the face of the turret and rotate it back to center.

If run an indicator on the edge of the turret say T1 and then rotate to T6 the turret I moved in about .180. It is not running concetricly. Should I leave the SOB and not worry about it or should I be fixing it?

I am not sure which bolt pattern. Their are two one is about in about a 10" diametr in the tool pockets with countersunk capscrews and the other has about 8 bolts in the middle but its a small bolt pattern.

Sorry guys I am a turret rookie if you havent noticed already.

Hello,

I forget which bolt pattern but there is a diagram and instructions in the maintance manual.
What you are going to do is loosen the bolts that hold the turret to the cervical(?) coupling and rotate it to the desired position.
You will need to use a 1" thick steel or o.d. tool blank mounted in an o.d. position and a large dead blow plastic hammer or a regular hammer and plywood to soften the shock. Extend the material about 10" or so past the turret if possible for leverage. The turret will be clamped under hydrolic pressure so it is not going to turn freely!

Do not try this with the turret "unclamped", for one it will not work and more than likely damage the spline or hydrolic motor or both, "big bucks"!

Something I would do is remove the turret and check everything out, add new greese to the coupling and do a p.m. on the coolant coupling.
You will also see where the bolt pattern for the coupling is you can do this in less than an hour and can add a lot of run time to the components in there, many of which cost a fortune!

This is a regular part of running a turret machine for years problem free!

Just remove all of your tools and holders, remove the nut cover in the middle of the turret.

***unclamp the turret on the bottom from the position screen******

Next, loosten the two small nuts on the nut on the main shaft and unscrew the nut, the turret is now free. You will need to use a small piece of brass and a ballpen hammer to break the nut loose and remove the nut.

****do not loosen all of the small screws below the main nut, that is the clamp that times the turret to the spline for tool changes, that is another lesson. That area should not have grease or moisture on it. You would only mess with that if your turrt is not seating in the cervic coupling on tool changes.

Place a 2X4 (wood) under the turret between the door or tailstock ways to cover on the far side of the turret for when you pull off the turret you can rest it on the wood.

Clean up everything, regrease the coupling. Remove the coolant coupling and replace o-rings and check for damage.


I have a couple of QT20 machines and I pull the turret every couple of years, I would not go too much over that!

Good luck with your new machine!

LandM1

Hello again,

I almost forgot, there might be 2 taper pins on the face of the turret below two threaded plugs. Most people remove those first thing and due to the fact that your turret moved on a light crash I doubt they are installed. They are used to orient the cervic coupling to turret upon assyembly and to create mayhem for those who do not remove them.
If they are installed they are now bent, that would be another thread!

LandM1

Wow great advice!! Thank you so much for your time! I will attack this on monday.

still not sure what you mean
do you mean radially, as in sweeping a drill pocket you can not get up and down to come in

routine for removing turret seems correct but that will not solve radial error

What I mean is that the turret is not concentric with the center of the mainshaft on the turret block. Its spins off center like it moved back into the machine in X axis.

That would indicate as a previous response pointed out, that the pins were either removed (likely) or severely bent (not likely in a light crash).
It's not uncommon.

the pins hold the radial location
consentricity sounds like a bent shaft
or maybe a radicaly out of position pinch couple

I would go a head and pull the turret off and see what is going on could be as simple as replacing some pins and/or bolts. Or worse case replacing a turret shaft.

Are you getting a Clamp Senor Malf after rotating?? If you are it is not clamping in the right spot and that is why you are so far off.

It's not a hard job just get in there and do it.


Justin

I dont get any malfunction so the couplers are lining up but the outer turret body is running out of round with the coupler..its a strange issue. I had a repair guy in today theroizing about it. He almost thought it was bad from the factory but I know it was after a light crash He wasnt there to work on the little Mazak but he was surely dumbfounded as was I.

Hello,

Is it running out during tool change rotation? Im now thinking someone crashed when the turret was unclamped and either bent the shaft or moved the spline sleve.

LandM1

out of round is surely an unqualified check
what is the centerline of the drill pockets compared to one another

Thats just it the centerline in X axis is off about .120-.180 when I index 180 degrees. It is indexing out of round but still clamping up right.

so what your saying is
if you sweep a drill pocket,find center
back out of hole using -z- only
then index and go to next pocket
the indicator no longer goes to center line you have to move -x- to get it back to center line of a differant pocket?

are these bolt on pockets?

Ok if I sweep a hole then index the turret to any of the 6 other holes in the face of the turret (12 pos turret) I am off in X axis. Once I go 180 degrees to the ohter hole on the other side of the turret I am off about .150". I was so frusterated I didnt sweep the other hole to get an exact reading. No not bolt on pockets.

sorry to be such a pain here
but i have swept a whole lot of turrets
and never seen something like this
the only thing i can imagine it being is the center shaft is bent
does the pocket/tool height change also?

i guess when you split that error in half to represent diameter its off about 75 thou,which may be a small enough error to let the curvic couple up but even that seems like a stretch when you talk about two mating circles

where Lelund on this one?